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Graphene-based polymer coatings for preventing marine corrosion : a review / Amit Sharma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 413-432 Titre : Graphene-based polymer coatings for preventing marine corrosion : a review Type de document : texte imprimé Auteurs : Amit Sharma, Auteur ; Sumit Sharma, Auteur Année de publication : 2023 Article en page(s) : p. 413-432 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Enrobage (technologie) Graphène -- Synthèse Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Métaux -- Revêtements protecteurs Protection cathodique Revêtements antisalissures:Peinture antisalissures Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, many breakthroughs in research on graphene as a corrosion-resistant coating for metal have been witnessed due to its excellent properties like chemical stability, mechanical strength, permeability, etc. The present review discusses graphene and its composite as an anticorrosive coating for marine applications. The economic and environmental losses caused by the corrosion in day-to-day life are large, and coatings are one of the preventive measures to reduce these losses. The corrosion gets accelerated when some significant factors like salinity, pH, water velocity, temperature, and dissolved oxygen content also come into picture. The excellent physical and chemical properties for graphene like high strength electrical conductivity, large surface area, etc., make it a potential candidate for a number of applications. The different techniques for the synthesis of graphene and its derivatives like graphene oxide and reduced graphene oxide have been also briefed in this review. The pure graphene coatings have shown excellent anticorrosive properties. However, defects in pure graphene coating have a substantial impact compared to multilayering for anticorrosive behavior. Graphene-based composites are more durable and reliable than pure graphene coating. The various techniques for the synthesis of graphene-based polymer coatings are solution mixing, melt mixing, and in situ polymerization. In the marine environment, graphene should be dispersed uniformly parallel to the metallic surface to provide excellent erosion corrosion properties. However, cathodic protection is a crucial issue in organic coatings, and zinc-rich graphene coatings are effective in case of defects in the coating. Other functional properties of graphene-based polymeric coatings like antifouling, hydrophobicity, better mechanical and wear properties, UV protection, and electrical conductivity give an edge to these coatings in marine conditions. Note de contenu : - MARINE CORROSION : Mechanism of corrosion - Factors triggering marine corrosion - GRAPHENE AND ITS DERIVATIVES : Synthesis routes of graphene and its derivatives - GRAPHENE AS AN ANTICORROSIVE COATING - GRAPHENE COATING : CHALLENGES AND OPTIMIZATION MEASURES - GRAPHENE COMPOSITE COATING : Synthesis route of graphene-based polymer coatings - Optimization measure for graphene-based composite coating - Graphene conductance and cathodic protection - Graphene composite coating as a functional coating - FUTURE SCOPE - Table 1: Various synthesis routes of GO - Table 2 : Graphene-based composite coatings DOI : https://doi.org/10.1007/s11998-022-00730-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00730-x.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39289 [article]

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Surface modification techniques of magnesium-based alloys for implant applications / Vinod Kumar Mahto in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 433-455 Titre : Surface modification techniques of magnesium-based alloys for implant applications Type de document : texte imprimé Auteurs : Vinod Kumar Mahto, Auteur ; Arvind Kumar Singh, Auteur ; Anup Malik, Auteur Année de publication : 2023 Article en page(s) : p. 433-455 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Implants médicaux Magnésium -- Alliages Matériaux -- Propriétés mécaniques Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Biodegradable materials like magnesium-based alloys are widely employed for making implants. Mg-based alloys show good biocompatibility, biodegradability, and mechanical properties similar to bone material unlike other commonly used implant materials, i.e., stainless steel, titanium, and Co–Cr alloy, which have negligible degradation rates and require revision surgery for the removal of the implant. Magnesium alloy-based implant has high degradation rates and avoids the need for a second surgery. But high degradation rates and poor mechanical properties in magnesium alloys also pose a challenge to their use as implant material. In the absence of controlled degradation, they can degrade completely before serving their intended purpose in the human body. Several surface modification techniques are used to control the degradation rates. Surface coating is one of the methods of surface modification. This paper discusses various types of surface coating techniques for magnesium-based alloys. This paper also discusses the future scope of surface technology of magnesium-based implant materials. Note de contenu : - TYPES OF MEDICAL IMPLANTS - BASIC REQUIREMENTS OF A SUITABLE IMPLANT MATERIAL - COMMONLY USED MATERIALS FOR IMPLANT APPLICATIONS - IMPORTANCE OF MAGNESIUM ALLOY FOR IMPLANT APPLICATIONS : Designation of magnesium alloys - Mechanical properties analysis of Mg with other metallic implants - Advantages and disadvantages of Mg alloys - Need of surface modification in magnesium-based implant materials - VARIOUS SURFACE MODIFICATION TECHNIQUES OF MAGNESIUM-BASED ALLOYS : Conversion coatings - Non-conversion coatings - CONCLUSIONS AND FUTURE SCOPE : Surface morphology - Corrosion rate - Materials used for coating - Mechanical behavior - Type of method used for coating - Table 1 : Important properties of implant material - Table 2 : Commonly used materials for implant applications - Table 3 : Abbreviation used for alphanumeric designation of various alloys of magnesium - Table 4 : Alphanumeric designation of magnesium alloys (example of AZ31B in parentheses) - Table 5 : Mechanical properties of implant materials - Table 6 : Advantages of Mg-based alloys - Table 7 : Disadvantages of Mg-based alloys - Table 8 : Various coating materials reviewed in this paper - Table 9 : Different coating processes, substrate materials, coating materials, related advantages, and disadvantages DOI : https://doi.org/10.1007/s11998-022-00716-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00716-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39290 [article]

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Interaction of interfacial debonding and under-film corrosion propagation at the edge of the blistering area of epoxy coating / Chao Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 457-468 Titre : Interaction of interfacial debonding and under-film corrosion propagation at the edge of the blistering area of epoxy coating Type de document : texte imprimé Auteurs : Chao Li, Auteur ; Jin Gao, Auteur ; Yunhua Huang, Auteur ; Xin Zhang, Auteur ; Xiaogang Li, Auteur Année de publication : 2023 Article en page(s) : p. 457-468 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Chimie des surfaces Cloquage (défauts) Corrosion Epoxydes Revêtements organiques Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The blistering of epoxy coating and its evolution were investigated after being exposed to 3.5 wt% NaCl solution. The evolution of under-film corrosion could be divided into four stages according to the observation of the corrosion morphology and the distribution of corrosion products and elements. Corrosion propagation was related to the distribution of media at the edge of the blistering area. Local electrochemical impedance spectroscopy analysis revealed that local impedance mapping could help in predicting the direction of corrosion propagation. The interfacial debonding at the edge of the blistering area was a necessary condition for corrosion propagation. Note de contenu : - EXPERIMENT : Specimens - Instrumentation - RESULTS : Analysis of microenvironment under blistering - Local electrochemical impedance of the blistering area DOI : https://doi.org/10.1007/s11998-022-00680-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00680-4.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39291 [article]

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The reduction in ice adhesion using controlled topography superhydrophobic coatings / Yujie Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 469-483 Titre : The reduction in ice adhesion using controlled topography superhydrophobic coatings Type de document : texte imprimé Auteurs : Yujie Wang, Auteur ; Jinde Zhang, Auteur ; Hanna Dodiuk, Auteur ; Samuel Kenig, Auteur ; Jo Ann Ratto, Auteur ; Carol Barry, Auteur ; Joey Mead, Auteur Année de publication : 2023 Article en page(s) : p. 469-483 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Caractérisation Epoxydes Fluoroalkylsilane Hydrophobie Interfaces solide-liquide Liants Mouillage (chimie des surfaces) Nanoparticules Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Topographie Index. décimale : 667.9 Revêtements et enduits Résumé : Since ice formation on surfaces at subzero temperatures leads to accidents, increased equipment maintenance costs, and reduced performance, multiple strategies, including superhydrophobic surfaces and coatings, have been explored as means to reduce ice adhesion to solid surfaces. Previous work has correlated the effect of topography of regularly patterned superhydrophobic surfaces with ice adhesion. This work, however, investigated the effect of filtered topography on ice adhesion for random superhydrophobic surfaces. The ice adhesion behavior of superhydrophobic composite coatings, prepared from a mixture of silica nanoparticles and polymer binder and sprayed on glass slides, was determined using a shear strength measurement. The ice adhesion significantly decreased with an increase in particle content up to 40 wt.%, after which the ice adhesion became nearly constant. The present study focuses on the use of a novel filtering method for coating topography evaluation which isolated the asperities contributing to the interface from the roughness profile in the superhydrophobic coating. It showed that the ice adhesion correlated with the filtered asperity height and spacing for these random hydrophobic surfaces. Higher particle contents led to larger asperity distances, smaller solid fractions, and lower ice adhesion. The results and conclusions are based on a static ice adhesion test using still water. In this work, it is demonstrated that ice adhesion can be predicted based on the solid–water–air interface, a correlation that could guide future superhydrophobic coating fabrication to create surfaces with greater reduction in ice adhesion. Note de contenu : - Materials - Preparation of SHP coatings - Surface wetting characterization - Visualization of solid-water interface - Ice shear adhesion strength measurement - Topography characterization - Table 1 : Composition of SHP coatings with different particle contents - Table 2 : Measured topographical parameters of defined asperities and particle content - Table 3 : Definition of design parameters in this work - Table 4 : Design parameters for the SHP surfaces DOI : https://doi.org/10.1007/s11998-022-00682-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00682-2.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39292 [article]

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Artificial neural network modeling of tablet coating in a pan coater / Assia Benayache in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 485-499 Titre : Artificial neural network modeling of tablet coating in a pan coater Type de document : texte imprimé Auteurs : Assia Benayache, Auteur ; Lynda Lamoudi, Auteur ; Kamel Daoud, Auteur Année de publication : 2023 Article en page(s) : p. 485-499 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Comprimés Enrobage pharmaceutique Ethylcellulose Matériaux -- Epaisseur Réseaux neuronaux (informatique) Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Our study decided to use the new and revolutionary approach in the field of pharmaceutical coating processes called the artificial neural network (ANN) by using the neural networks toolbox derived from the Matlab® software. The experiments were performed using tablets of Alfuzosin Chlorhydrate as a model filler, and an aqueous solution of Surelease as a polymer in different contents. The various parameters that can affect coating thickness, weight gain, and the coefficient of variation CV, such as spray rate, air pressure, solid content, speed of the drum, pan loading, and time of coating, were studied. The properties of the coated tablets were evaluated using the ANN, and both the parameters of the coating process and the properties of the coated tablets were used as a basis for optimization, as well as the choice of the optimal structure of the ANN model. It was found that the best neural network architecture had 7 neurons in the hidden layer, with a mean square error of 3.515 and a determination coefficient of nearly 1. The relative importance of each independent variable was quantified using the Garson equation. In this study, spray rate was found to have the highest impact on the properties of tablets. Note de contenu : - MATERIALS AND METHODS : Characterization of core tablets - Coating dispersion - Coating process - Characterization of the coating solution - Characterization of coating tablets - RESULTS AND DISCUSSION : Model architecture and prediction - Relative importance of input variables - The influence of parameters on the properties of coating tablets - Optimization of coating tablets - Table 1 : Effect of solids concentration on the viscosity, density, and surface tension of coating fluids measured coating - Table 2 : Variable parameters - Table 3 : ANN model's weight and bias matrix - Table 4 : Effects of coating parameters on the relative standard deviation at the final process stage - Table 5 : Ideal values of inputs, predicted and experimental values of outputs DOI : https://doi.org/10.1007/s11998-022-00683-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00683-1.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39293 [article]

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Vanillin as low-temperature isocyanate-blocking agent and its use in one-component aqueous coatings / Philipp Knospe in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 501-520 Titre : Vanillin as low-temperature isocyanate-blocking agent and its use in one-component aqueous coatings Type de document : texte imprimé Auteurs : Philipp Knospe, Auteur ; René Reichmann, Auteur ; Jochen S. Gutmann, Auteur ; Michael Dornbusch, Auteur Année de publication : 2023 Article en page(s) : p. 501-520 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de blocages Analyse thermomécanique dynamique Déblocage Dispersions et suspensions Durée de vie (Ingénierie) Formulation (Génie chimique) Liants en phase aqueuse Polyisocyanates Revêtements en phase aqueuse Trimères En chimie, un trimère est un objet moléculaire ou une structure composée de l'association de 3 éléments de base semblables entre eux. C'est un composé chimique issu de la réaction entre trois molécules identiques (appelées monomères). La réaction chimique qui produit des trimères est appelée trimérisation. Vanilline Index. décimale : 667.9 Revêtements et enduits Résumé : Mainly because of the high sensitivity of the isocyanate group to atmospheric moisture, it is blocked with a blocking agent for many applications and thus kept as inert as possible at room temperature (Zhang et al. in Langmuir ACS J Surf Colloids 37:12705, 2021, Meier-Westhues in Polyurethane: Lacke, Kleb-und Dichtstoffe, Vincentz Network, Hannover, p 36, 2007). When exposed to temperature, the protective group unblocks, and the isocyanate group reacts with the reactant that was previously present together with the blocked isocyanate (Meier-Westhues in Polyurethane: Lacke, Kleb- und Dichtstoffe, Vincentz Network, Hannover, p 36, 2007, Goldschmidt and Streitberger in BASF handbook on basics of coating technology, Vincentz Network, Hannover, pp 96–99, 2007). Many of the substances which are used today as blocking agents have toxicological concerns or unblock at high temperatures, which limits their application areas (Guillem Parra et al. in Blocked isocyanate polyurethane compositions using a new blocking agent, method of manufacture and uses thereof: European patent application, 2019, https://data.epo.org/publication-server/document?iDocId=6506253&iFormat=0). In this work, vanillin is presented as an effective deblocking agent at low temperatures and is compared with similar structures. The process of deblocking from an hexamethylene diisocyanate trimer (HDI-trimer) is followed by means of IR-spectroscopic measurements at different temperatures and thermogravimetric analysis. Temperature-dependent oscillation measurements using a rheometer are suitable for measuring onset temperatures and for qualitatively tracking the unblocking process. The combination of the results is used to draw conclusions about the existing deblocking mechanism. The comparatively low deblocking temperature of vanillin enables the formulation of an HDI-trimer modified with sulfonate groups and blocked with vanillin, which is dispersed in the aqueous phase and then reacted with OH-functional binders. Deblocking and subsequent reaction with the binder are followed by means of IR spectroscopy, and the mechanical properties of the coating films are examined. Vanillin is therefore suitable as a toxicologically harmless blocking agent for isocyanates and enables the production of crosslinkers for one-component water-based coatings (Arya et al. Adv Tradit Med (ADTM) 21:1, 2021). Note de contenu : - Raw materials - Analytical methods - Synthesis of the compounds : 4-(Hydroxymethyl)benzaldehyde - Vanillin-Na-4-HBS-trimer - Application testing - Table 1 : Mean values of deblocking temperatures from selected blocking agents - Table 2 : Formulations for the reaction between vanillin-Na-4-HBS-trimer and different water-based binders - Table 3 : Coating properties of reaction of vanillin-Na-4-HBS-trimer with different water-based binders DOI : https://doi.org/10.1007/s11998-022-00696-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00696-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39294 [article]

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Preparation of polyurethane coating formulation based on dihydropyridine derivatives as an insecticide and antifungal additives for surface coating applications / Mohamed A. Awad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 521-533 Titre : Preparation of polyurethane coating formulation based on dihydropyridine derivatives as an insecticide and antifungal additives for surface coating applications Type de document : texte imprimé Auteurs : Mohamed A. Awad, Auteur ; N. M. Saleh, Auteur ; M. M. Elsawy, Auteur ; Salem S. Salem, Auteur ; H. Abd El-Wahab, Auteur Année de publication : 2023 Article en page(s) : p. 521-533 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Caractérisation Dihydropyridine Formulation (Génie chimique) Insecticides Polyuréthanes Revêtement de surface Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Vernis -- Additifs Vernis bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : Pyridine derivatives are prepared and evaluated before being incorporated into polyurethane coating formulations to create antifungal and insecticidal coating compositions. Different analyses, including Fourier transform infrared (FTIR), mass, proton nuclear magnetic resonance (1HNMR), and carbon-13 nuclear magnetic resonance (13C NMR) spectra, were used to confirm the synthesized compounds. The material has been coated using a polyurethane coating mixture. Gloss, scratch resistance, flexibility, and adhesion are some of the coating attributes investigated; mechanical capabilities include impact resistance and shore hardness, and physicochemical properties such as chemical resistance of coated polyurethane (PU) samples are also investigated. PU coatings were applied to substrates to measure coating properties. The mechanical properties of the PU cast films were measured. The results of the experiments revealed that all PU coatings based on dihydropyridine derivatives had good scratch resistance which varied from > 1.5 to > 2 kg. While reducing gloss value varied from 65 to 85, there is no effect of the prepared compounds in the other mechanical test. These PU coatings have excellent chemical resistance except the alkali resistance as evidenced by their physicochemical properties. The observed antifungal and insecticide activities indicated that dry wood coated with PU based on dihydropyridine derivatives is promising for resistance to these insects and fungi, in comparison with the paint as blank. The results revealed that the inhibition zones diameter by compound 2 were 25.1 ± 0.69, 23.2 ± 0.94, 20.16 ± 0.62, 20 ± 0.80, and 18 ± 0.81 mm against A. terreus, A. niger, A. flavus, C. albicans, and A. fumigatus, respectively, whereas the inhibition zones (IZ) diameter by compound 3 were 22.56 ± 0.30, 21.03 ± 0.49, 21.03 ± 0.61, 21 ± 0.66, and 20 ± 0.78 mm versus A. niger, A. fumigatus A. flavus, C. albicans, and A. terreus, respectively. The ordering activity against insects increased as the dose concentration of the pyridine derivatives was increased. Note de contenu : - MATERIALS AND METHODS : Materials - Methods and technique - 6-Diamino-4-(2-bromophenyl)-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (2) - 6-Amino-1-((2-bromobenzylidene)amino)-4-(4-hydroxy-3-methoxyphenyl)-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (3) - Characterization of the prepared organic compound by spectral analysis - Application of the Insecticide-based PU (polyurethane) varnish and Control PU (polyurethane) varnish - Characterization techniques - Antifungal activity of pyridine derivatives (2 and 3) - Characterization of insects - Bioassay with paint - STATISTICAL ANALYSIS OF DATA - RESULTS AND DISCUSSION : Characterization of the prepared polyurethane varnish embedded with pyridine derivatives as antifungal and insecticide agents - Physical and mechanical characteristics of the coated films by PU (polyurethane) varnish embedded with the prepared additives - Antifungal activity - Adulticidal assay of the prepared pyridine derivatives - Table 1 : Formulation of two pack high gloss polyurethane varnish incorporated with dihydropyridine derivatives - Table 2 : Physical and mechanical characteristics of the coated films by PU varnish embedded with the prepared additives - Table 3 : Chemical resistance of pure PU varnish and PU incorporated with dihydropyridine derivatives - Table 4 : Insecticide activity of 2 and 3 against adult house fly Musca domestica and calculated LC50(LC90) after 72 h of mortalityTable 5 Insecticide activity of 2 and 3 incorporated with PU varnish against adult of house fly Musca domestica and calculate LC50(LC90) after 72 h of mortality DOI : https://doi.org/10.1007/s11998-022-00684-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00684-0.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39295 [article]

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Preparation and antiaging performance of urushiol-titanium polymer/a-zirconium phosphate composite coatings / Guocai Zheng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 535-543 Titre : Preparation and antiaging performance of urushiol-titanium polymer/a-zirconium phosphate composite coatings Type de document : texte imprimé Auteurs : Guocai Zheng, Auteur ; Pingfei Wu, Auteur ; Xiaoxiao Zheng, Auteur ; Fencai Lin, Auteur ; Qi Lin, Auteur ; Yanlian Xu, Auteur Année de publication : 2023 Article en page(s) : p. 535-543 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Caractérisation Composites Essais accélérés (technologie) Phosphate de zirconium Polymères organiques-inorganiques Revêtements -- Propriétés mécaniques Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Anti-corrosion coatings often fail due to aging effects. Therefore, taking advantage of the positive effects of multilayer structure of a-zirconium phosphate (α-ZrP) on the anti-aging properties of coatings, organic–inorganic composite materials based on a-ZrP were synthesized. Firstly, a-ZrP was synthesized by a hydrofluoric acid precipitation method. Then, CT-ZrP was prepared by a-ZrP, pre-intercalated successively with cholamine and cetyltrimethylammonium bromide (CTAB). The synthesized CT-ZrP was then used for synthesizing urushiol-titanium polymer/ZrP composite coatings (M-ZrP) through intercalation. The results of XRD, TEM, and FTIR proved the successful intercalation of α-ZrP and the loss of layering M-ZrP composite coatings in the process of exfoliation. TG results showed that the thermal stability of M-ZrP3 (3 wt% CT-ZrP) was higher than that of urushiol-titanium polymer (UTP). After 1000 h of accelerated aging, 3 wt% of CT-ZrP could significantly improve the anti-aging property of the UTP coating, and the maximum rate of gloss loss was the lowest (5.9%). Note de contenu : - INTRODUCTION : Experimental - Preparation of a-ZrP - Preparation of CA-ZrP - Preparation of CT-ZrP - Preparation of M-ZrP - General characterization - Mechanical measurement - Accelerated aging test - RESULTS AND DISCUSSION : Morphological and structural analyses - Morphology of M-ZrP3 nanocomposite - Thermal stabilities of nanocomposite coatings - Antiaging performance of nanocomposite coatings - Mechanical properties of nanocomposite coatings - Table 1 : TGA data of UTP and M-ZrP3 - Table 2 : Elemental composition of M-ZrP3 coating before accelerated aging - Table 3 : Elemental composition of M-ZrP3 coating after accelerated aging - Table 4 : Mechanical properties of coatings DOI : https://doi.org/10.1007/s11998-022-00686-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00686-y.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39297 [article]

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Investigation of UV-curable alkyd coating properties / Qianhe Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 545-557 Titre : Investigation of UV-curable alkyd coating properties Type de document : texte imprimé Auteurs : Qianhe Wang, Auteur ; Jomin Thomas, Auteur ; Mark D. Soucek, Auteur Année de publication : 2023 Article en page(s) : p. 545-557 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diluants Formulation (Génie chimique) Huile de lin L'huile de lin ou "huile de graines de lin" est une huile de couleur jaune d'or, tirée des graines mûres du lin cultivé, pressées à froid et/ou à chaud ; parfois elle est extraite par un solvant, en vue de l'usage industriel ou artistique, principalement comme siccatif, ou huile auto-siccative. Les utilisations de l'huile de lin dérivent de sa richesse en acides gras polyinsaturés, en particulier en acides linolénique et linoléique, qui lui doivent leur nom. L'huile de lin polymérise spontanément à l'air, avec une réaction exothermique : un chiffon imbibé d'huile peut ainsi, dans certaines conditions, s'enflammer spontanément. Pour ses propriétés de polymère, l'huile de lin est employée seule, ou mélangée à d'autres huiles, résines et solvants, et est utilisée en tant que : Imprégnateur et protecteur des bois à l'intérieur comme à l'extérieur : protection contre l'humidité, les champignons et insectes, et contre la poussière par son caractère antistatique, composant de certains vernis de finition, liant de broyage pour la peinture à l'huile, agent plastifiant du mastic de vitrier, agent durcisseur de diverses préparations, agent de cohérence et liant dans la fabrication du linoléum. Méthacrylates Photoréticulation Polyalkydes Polymères -- Synthèse Réticulants Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Triacrylate de glycérol Triméthacrylate de glycérol Index. décimale : 667.9 Revêtements et enduits Résumé : Four types of UV-(meth)acrylate curable alkyds were synthesized and formulated with two tri(meth)acrylate reactive diluents. Thermal, mechanical, and coating properties, including gloss, adhesion, hardness, impact resistance, and chemical resistance, were evaluated. In general, methacrylate-based UV-curable alkyd has higher modulus and toughness, whereas acrylate-based UV-curable alkyd has better flexibility and adhesion. In all four UV-curable alkyd resin systems, increasing reactive diluent content will enhance properties like tensile strength and modulus, hardness, and chemical resistance. However, there is a decrease in properties such as elongation at break, adhesion, and impact resistance. Among four UV-curable alkyd resin, acrylated medium linseed oil alkyd exhibited the best overall performance than other systems in terms of hardness, flexibility, and adhesion. Particularly, acrylated medium linseed oil alkyd formulations with 20–30 wt% of glycerol triacrylate as reactive diluent showed the best coating performance. It is possible to produce coating films with a good balance of crosslink density, flexibility, and adhesion using such UV-curable alkyd systems. Further, it has a huge potential in alkyds as an alternative for cobalt-based drier system. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Formulation of UV-curable alkyd resin - Instrumentation and properties measurement - RESULTS AND DISCUSSION : Fracture toughness - Tensile test - Viscoelastic properties - Coatings properties - Table 1 : Formulation of the long oil and medium oil linseed oil alkyd - Table 2 : Formulation of the methacrylated and acrylated long and medium linseed oil alkyd - Table 3 : Formulation of the glycerol trimethacrylate and glycerol triacrylate - Table 4 : Coating properties of all UV-curable alkyd systems DOI : https://doi.org/10.1007/s11998-022-00697-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00697-9.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39298 [article]

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Biofilm inhibiting nanocomposite coatings on stainless steel surgical instruments : a possible strategy to prevent TASS / Birru Bhaskar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 559-572 Titre : Biofilm inhibiting nanocomposite coatings on stainless steel surgical instruments : a possible strategy to prevent TASS Type de document : texte imprimé Auteurs : Birru Bhaskar, Auteur ; Ramay Patra, Auteur ; K. R. C. Soma Raju, Auteur ; V. Nagarjuna, Auteur ; Susmita Chaudhuri, Auteur ; R. Subasri, Auteur ; Prashant Garg, Auteur Année de publication : 2023 Article en page(s) : p. 559-572 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Biofilms -- Analyse Caractérisation Dodécyl sulfate de sodium Le laurylsulfate de sodium (LSS) ou dodécylsulfate de sodium (SDS) est un détergent et tensioactif ionique fort, couramment utilisé en biochimie et biologie moléculaire. C'est un composé à ne pas confondre avec le laureth sulfate de sodium. La concentration micellaire critique du SDS varie de 0,007 à 0,01 mol/L dans l'eau à 25°C. Le dodécylsulfate de sodium (en anglais, Sodium Dodecyl Sulfate ou SDS ou/ NaDS), de formule C12H25NaO4S, aussi connu sous le nom de laurylsulfate de sodium (en anglais, sodium lauryl sulfate ou SLS), est un tensioactif ionique qui est utilisé dans les produits ménagers tels que les dentifrices, shampooings, mousses à raser ou encore bains moussants pour ses effets épaississants et sa capacité à créer une mousse, il est également repris comme additif alimentaire par le codex alimentarius (E487). La molécule est composée d’une chaîne de 12 atomes de carbone, rattachée à un groupement sulfate conférant à la molécule les propriétés amphiphiles requises pour un détergent. Le SDS est préparé par sulfonation du dodécanol (alcool de lauryl, C12H25OH), suivie par une neutralisation par du carbonate de sodium. Le SDS est utilisé aussi bien dans les procédés industriels que pour les produits cosmétiques destinés au grand public. Endotoxines Inhibition microbienne Matériaux hybrides Materiel chirurgical Pince de Lims Polyacrylamide Le polyacrylamide est un polymère (-CH2-CH(-CONH2)-) formé à partir d'acrylamide. Il peut être réticulé en incorporant dans le mélange de polymérisation un dérivé bi-fonctionnel de l'acrylamide : le N,N'-méthylène-bis-acrylamide (CH2=CH-CO-NH-)2CH2. Le polyacrylamide, contrairement à l'acrylamide qui est neurotoxique, n'est pas toxique mais il doit être manipulé avec précaution car il peut contenir des résidus d'acrylamide. c'est un gel hautement absorbant. Sous forme de poudre, il se dilue dans l'eau pour former un gel visqueux après agitation vigoureuse. Des substances ioniques telles le sel permettent au polyacrylamide de libérer les substances absorbées. L'intérêt de ce polymère peut être apprécié dans son caractère de fluide non newtonien, et constitue un bon exemple d'application de l'effet Weissenberg: le fluide, soumis à l'action d'un agitateur magnétique remonte au centre du récipient au lieu de se plaquer sur les côtés, comme l'aurait fait un fluide newtonien classique, comme l'eau. Polymères en médecine Revêtements organiques Syndromes toxiques du segment antérieur Le syndrome toxique du segment antérieur (TASS pour les Anglo-Saxons) est une réaction inflammatoire stérile liée à la pénétration accidentelle de substances toxiques non infectieuses au sein du segment antérieur de l’œil lors d’un acte chirurgical. Le tableau clinique initial est souvent indiscernable ou très proche d’un tableau d’endophtalmie infectieuse. Le TASS survient dans la plupart des cas 12 à 72 heures après la chirurgie de la cataracte. L’inflammation de segment antérieur est en général assez sévère, associée à un hypopion. Les dommages endothéliaux sont fréquents, à l’origine d’un œdème de cornée diffus. Il n’existe pas d’inflammation du segment postérieur. Les résultats microbiologiques sont négatifs. Les causes de TASS sont nombreuses, variées et difficiles à individualiser. Tout matériel ou substance introduit dans l’œil en peropératoire ou en postopératoire immédiat est susceptible d’être impliqué. Les principales étiologies connues comprennent : les conservateurs, les résidus de visqueux présents au niveau des dispositifs réutilisables, les endotoxines bactériennes et les implants intraoculaires. Le TASS étant initialement indiscernable d’une endophtalmie infectieuse, il est en général diagnostiqué et traité à la phase aiguë comme une infection. Les anomalies inflammatoires régressent dans la plupart des cas sous traitement anti-inflammatoire corticoïde local, mais une hypertonie intraoculaire et/ou un œdème de cornée chroniques peuvent persister, résultant d’une atteinte trabéculaire ou endothéliale irréversible. (Journal Français d'Ophtalmologie Volume 34, N° 1, Janvier 2011, Pages 58-62) Index. décimale : 667.9 Revêtements et enduits Résumé : Toxic anterior segment syndrome (TASS) is an inflammation that occurs after anterior segment surgeries, and is widely seen in the patients after cataract surgery. The main cause of TASS is postulated to be the bio-residue and heat stable endotoxins which persist on the used forceps even after autoclave sterilization, some of which are known to cause inflammation. In this work, initially, a detailed characterization of bio-residue composition before and after autoclave sterilization of the forceps used in ophthalmic surgeries was carried out by Fourier-transform infrared spectroscopy (FTIR) and gas chromatography mass spectrometry (GCMS) techniques. The morphological features of biofilm before and after autoclave were also examined using a field emission scanning electron microscope (FESEM). Subsequently, two biofilm inhibiting nanocomposite coating formulations which were earlier developed by us were deposited on stainless steel 420 coupons to mimic surgical instruments. Biofilm inhibition was studied for bare and coated substrates after autoclaving using crystal violet staining as well as by FESEM analysis. It was observed that the coated substrates prevented biofilm formation even after autoclaving. The results of this study demonstrate that the biofilm inhibiting coatings prevent formation of biofilm and hence, prevent deposition of bioresidues on stainless steel surgical instruments. Due to this, the coated surgical instruments are safe to use even after autoclaving and cannot be expected to cause any inflammatory responses after surgeries, thereby preventing TASS. Note de contenu : - MATERIALS AND METHODS : Materials - Bacterial inoculum preparation - Biofilm formation on surgical instruments (Lims forceps) and SS 420 substrates - Biofilm quantification - Biofilm morphology analysis using field emission scanning electron microscopy (FESEM) - Sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis - Fourier transform infrared (FTIR) analysis - Gas chromatography mass spectrometry (GCMS) analysis - Nano composite sol synthesis and deposition on SS 420 substrates - Water contact angle (WCA) and roughness measurement on bare, IH and HC coated SS 420 - Microstructure analysis of nanocomposite coatings before and after autoclave - Biofilm inhibition study on bare, IH and HC coated substrates after autoclave - RESULTS : Biofilm formation on stainless steel coupons - Biofilm formation on Lims forceps - Biofilm morphology on LFSE, and LFWE before and after sterilization - FTIR and GCMS results - WCA and roughness measurement on bare, IH and HC coated SS 420 - Microstructure analysis of coatings before and after autoclave - Biofilm inhibition study on bare, IH and HC coated substrates after autoclaving - DISCUSSION : Biofilm analysis by FESEM, GCMS and FTIR - Effect of autoclaving on biofilm inhibition and biofilm inhibiting coatings on SS coupons - Table 1 : Major band obtained from the FTIR spectra of biofilm before and after autoclave - Table 2 : Chemicals in bioresidue after autoclave sterilization of used Lims forceps through GCMS analysis DOI : https://doi.org/10.1007/s11998-022-00-689-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00689-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39299 [article]

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Formulation and testing of a slow-release antimicrobial paint: a case study of antifungi and antialgae activity for interior and exterior applications / Amir S. Kazemi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 573-585 Titre : Formulation and testing of a slow-release antimicrobial paint: a case study of antifungi and antialgae activity for interior and exterior applications Type de document : texte imprimé Auteurs : Amir S. Kazemi, Auteur ; Roozbeh Mafi, Auteur ; Drew C. Higgins, Auteur Année de publication : 2023 Article en page(s) : p. 573-585 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-algues Antifongiques Antimicrobiens Essais accélérés (technologie) Formulation (Génie chimique) Lixiviation Polyacryliques Revêtements organiques Spectroscopie ultraviolette Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The colonization of microorganisms on painted surfaces varies according to paint formulation, support substrate, and environmental conditions. Developing antimicrobial coatings to prevent growth of microorganisms can prevent adverse health and environmental consequences. Release of antimicrobial agents from the coating surface over time presents toxicity and diminishing antimicrobial protection challenges. Herein, we have formulated and performed 272 tests (including the control experiments, and not including the replication assays) on water-based paint formulations against different species, including Aureobasidium pullulans and Chlorella vulgaris, among others, before and after accelerated weathering tests. Based on the zone of inhibition values (Z value) from fungi and algae resistance tests, 97% of the formulations were effective against fungi species prior to accelerated weathering, while approximately one-third were effective against algae species. Formulations with lower Z values (X2-678, X3-P20T, R1-663, and X2-663) indicated slow release of the biocide via diffusion-controlled behavior is effective in performance optimization and minimizing environmental impacts. For antialgae applications, R1-663 and X2-663 with average Z value variations of 3.3 and 2.0 mm, respectively, ensure full protection. Weathering testing demonstrated 3 of 10 samples failed by cracking and delamination. The main objective of this work is to evaluate, compare, and enhance antimicrobial paint formulations considering the advantages of slow-release and controlled-release approaches. Among samples that passed weathering tests, X1-663, X1-P20T, X3-663, and X3-P20T had the most consistent antifungi activity, while X1-663 and X3-663 showed the best antialgae activity. The difference in antifungi and antialgae activity was mainly attributed to differences in release mechanism based on biocides’ solubility in water, size, and diffusion through the coating layer. Note de contenu : - MATERIALS AND METHODS : Formulation - Resistance tests against fungi and algae - Weathering test - Biocide leaching quantification by UV-Vis spectroscopy - RESULTS AND DISCUSSION : Fungi and algae resistance tests - Accelerated weathering test - Biocide release detection - Table 1: Acrylic antimicrobial paint formulation - Table 2 : List of the biocides used in this work - Table 3 : Type and concentration of resin and crosslinker present in each formulation - Table 4 : Accelerated weathering results DOI : https://doi.org/10.1007/s11998-022-00691-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00691-1.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39300 [article]

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Influence of the association of hydrophobic end groups on the temperature insensitivity of HEUR-thickened latex/Fe2O3/Zn3(PO4)2/BaSO4 suspensions / Yating Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 587-601 Titre : Influence of the association of hydrophobic end groups on the temperature insensitivity of HEUR-thickened latex/Fe2O3/Zn3(PO4)2/BaSO4 suspensions Type de document : texte imprimé Auteurs : Yating Lin, Auteur ; Chunmei Song, Auteur ; Xiong Xiao, Auteur ; Wan Bo, Auteur Année de publication : 2023 Article en page(s) : p. 587-601 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions Formulation (Génie chimique) Latex Polymères -- Propriétés thermiques Polymères -- Synthèse Polyuréthane éthoxylé modifié de façon hydrophobe Résistance thermique Revêtements organiques Rhéologie Stabilité au stockage Thixotropie Index. décimale : 667.9 Revêtements et enduits Résumé : Hydrophobically modified ethoxylated urethane (HEUR) with different structures was synthesized and confirmed by gel permeation chromatography, Fourier transform infrared spectroscopy and nuclear magnetic resonance (1H NMR). We propose the relationship between the temperature insensitivity model and the thickening mechanism of HEUR/latex/Fe2O3/Zn3(PO4)2/BaSO4 suspensions. Meanwhile, the temperature insensitivity of HEUR/C suspensions is the result of two main associations: intermolecular interactions bridging the hydrophobic tails of HEURs and the hydrophobic groups tightly adsorbing onto the latex particle surfaces. A smaller ratio of viscosity (Rv) at 1 s−1 from the steady state condition indicates the better temperature insensitivity of viscosity. The higher degree of crystallinity and rheological activation energy corresponds to a great extent with better temperature insensitivity due to stronger association. The temperature insensitivity is consistent with the longer hydrophobic chain, which was proven by hysteresis tests and oscillatory shear measurements. The storage stability was enhanced in the lockstep with a hydrophobic length of HEUR, which is consistent with the rougher surfaces of HEUR/C films. As an appealing method, the results are meaningful and instructive for coating storage and application. Note de contenu : - EXPERIMENTAL : Materials - Measurements - Synthesis of HEURs - Preparation of HEUR/C suspensions - RESULTS AND DISCUSSION : Characterization of HEURs - Melting temperature and crystallinity of HEURs - Rheological behavior of HEUR/C suspensions - Storage stability and aggregation structure of HEUR/C suspensions - Table 1 : Description of the coating formulation - Table 2 : Molecular characteristics of polymers - Table 3 : Thermoproperties and crystallization of HEUR - Table 4 : Rheological properties of HEUR/C suspensions with different hydrophobicities - Table 5 : Storage stability of HEUR/C suspensions - Table 6 : Non-Newtonian exponents of HEUR/C suspensions - Table 7 : Roughness parameters of the sample films DOI : https://doi.org/10.1007/s11998-022-00692-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00692-0.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39301 [article]

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Facile preparation of anticorrosive and decorative multifunctional coatings via the inclusion of pearlescent oxide-covered mica pigments / Walaa M. Abd El-Gawad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 603-622 Titre : Facile preparation of anticorrosive and decorative multifunctional coatings via the inclusion of pearlescent oxide-covered mica pigments Type de document : texte imprimé Auteurs : Walaa M. Abd El-Gawad, Auteur ; Essam A. Mossalam, Auteur ; Mohamed M. Selim, Auteur Année de publication : 2023 Article en page(s) : p. 603-622 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Arrachement (matériaux) Brillance (optique) -- Mesure Caractérisation Colorimétrie Epoxydes Evaluation Formulation (Génie chimique) Mica Oxydes métalliques Pigments nacrés Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements décoratifs Revêtements décoratifs:Peinture décorative Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The keynote of this work was to prepare cost-saving intensely colored pearlescent pigments with anticorrosive properties via deposition of a low ratio of expensive mixed oxides on mica to be applied in decorative and anticorrosive multifunctional coatings. Herein, a mixture of CeO2 and Fe2O3 was precipitated on mica to prepare anticorrosive pigment with golden color, while brilliant intensive orange pigment was prepared via the deposition of ZrO2.Fe2O3 mix on mica. The prepared pearlescent pigments based on mica flakes covered with CeO2.Fe2O3 and ZrO2.Fe2O3 were characterized using scanning electron microscopy, energy-dispersive X-ray analysis, X-ray fluorescence, and thermal gravimetric analysis. The mixed oxide-covered mica pigments (Ce-Fe@M and Zr-Fe@M) were applied in two paint formulations in addition to one formulation containing mica for comparison. The color of the resulting coatings was investigated utilizing the CIELab technique. Additionally, the inhibitive properties of the coatings were determined using potentiodynamic anodic polarization, open circuit voltage, linear polarization resistivity, and electrochemical impedance spectroscopy techniques. The results declared that the color of the coating containing CeO2.Fe2O3@M is gold and that of ZrO2.Fe2O3/M is brilliant orange. Moreover, the results deduced that the resistance of coating containing Ce-Fe@M ranged between (5061–4887 Ω) and that containing Zr-Fe@M is from 6846 to 3290 Ω, while coating based on mica is the least. These results revealed that the present study has succeeded in offering both anticorrosive and decorative functions in a single-layered coat. Note de contenu : - EXPERIMENTAL : Materials - Characterization of the prepared pigments - Application in coatings - Methods of testing and evaluation of coating - RESULTS AND DISCUSSION : Pigments characterization - FTIR - Coatings morphology - Corrosion results - Color and gloss measurements - Mechanical properties of the coatings - Pull-off strength results - Table 1 : The paint formulations - Table 2 : XRF analysis of mica, Ce-Fe@M, and Zr-Fe@M - Table 3 : Corrosion resistance of the coatings containing mica, Ce-Fe@M, and Zr-Fe@M - Table 4 : Electrochemical measurements results obtained from potentiodynamicanodic polarization and OCV technique - Table 5 : EIS data of the coatings containing mica, Ce-Fe@M, and Zr-Fe@MTable 6 Color and gloss results of coatings containing mica, Ce-Fe@M, and Zr-Fe@M DOI : https://doi.org/10.1007/s11998-022-00693-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00693-z.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39306 [article]

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Facile synthesis of atomic oxygen-resistant methyl silicone rubber-coated Kapton film for photovoltaic solar array blanket in low Earth orbit / Yi Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 623-633 Titre : Facile synthesis of atomic oxygen-resistant methyl silicone rubber-coated Kapton film for photovoltaic solar array blanket in low Earth orbit Type de document : texte imprimé Auteurs : Yi Li, Auteur ; Zhonghua Li, Auteur ; Yanchun He, Auteur ; Kai Wang, Auteur ; Detian Li, Auteur Année de publication : 2023 Article en page(s) : p. 623-633 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Corrosion par érosion Elastomères silicones vulcanisables à chaud Kapton Le Kapton est un film de polyimide (polymère à base d'imide) développé à la fin des années 1960 par DuPont, qui peut rester stable dans une plage étendue de température, de −269 à 400 °C. Utilisation : La conductivité thermique du Kapton à des températures de 0,5 à 5 kelvins est plutôt élevée pour de telles températures basses. Ceci, combiné à ses bonnes qualités diélectriques et à sa disponibilité en tant que feuilles minces, en fait un matériau de prédilection pour la cryogénie, car il fournit une isolation électrique à faibles gradients thermiques. Le Kapton est régulièrement utilisé comme isolant dans des environnements à très haut vide en raison de son faible taux de dégazage. Il est utilisé, entre autres, dans le processus de fabrication des circuits imprimés souples, les supports de bobines mobiles de haut-parleurs haute puissance et pour l'isolation de certains fils électriques de « haute fiabilité » pour les domaines aéronautiques et spatiaux (lanceurs et satellites). Il est aussi utilisé dans le domaine de l'impression 3D grâce à son adhérence avec le plastique à des températures dépassant 40 °C et grâce à sa résistance à la chaleur. De plus, il peut être utilisé pour l'isolation des méplats cuivre ou aluminium. Cette isolation est utilisée pour la construction des moteurs de traction (de train) soumis à des températures élevées. Ce nom de marque est passé dans le langage courant, comme le kevlar[réf. souhaitée]. Un rouleau de Kapton adhésivé Un rouleau de Kapton adhésivé. Le Kapton est également utilisé dans la fabrication des circuits imprimés souples (dits « flex »), ainsi qu'en réparation électronique en tant qu'isolant. Il est disponible en ruban. Le Kapton peut aussi servir en impression 3D pour renforcer le pouvoir adhésif des plateaux chauffants souvent peu adhérents lors de l'impression des pièces plastiques. Bouclier thermique du télescope James-Webb, fait à partir de Kapton. Le bouclier thermique du télescope James-Webb est composé de cinq feuilles de Kapton (couvertes d'aluminium). (Wikipedia) Mesure Oxygène atomique Polyimides Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : A highly flexible coating deposited on organic substrates is one of the most suitable techniques for efficient atomic oxygen (AO) resistance in low Earth orbit (LEO). In this study, a highly homogeneous methyl silicone rubber coating as an AO-tolerant material was fabricated on a flexible Kapton film by a spraying process used in a photovoltaic solar array blanket. The produced silicone rubber coating has excellent AO resistance and exhibits a low shrinkage tendency after evaluating the effect of atomic oxygen on the erosion kinetics, surface morphology, and surface composition of this coating. The erosion yield of the silicone rubber-coated Kapton, which was less than 3.1% of that of the Kapton, was less than 0.92 × 10−25 cm3 atom−1 under an AO fluence of 4.04 × 1021 atoms cm−2 (equiv 10 years of AO exposure in the LEO with an altitude of 500 km). It suggests that the silicone rubber layer can effectively prevent AO from eroding Kapton. In addition, a SiO2 passivation layer was formed on the surface of the silicone rubber coating during AO irradiation, which demonstrated a “self-reinforcing” protection mechanism. This work also provides a facile method for designing and preparing large-scale flexible protective coatings with excellent AO resistance. Note de contenu : - EXPERIMENTAL : Materials - Fabrication of silicone rubber protective coating - Atomic oxygen exposure experiments - Thermal cycling test Measurements and characterization - RESULTS AND DISCUSSION : Characterization of methyl silicone rubber coating - Evaluation of AO resistance of silicone rubber protective coatings - The effect of AO on the surface morphology and optical properties of Kapton and silicone rubber-coated Kapton films - Influence of AO on the chemical structure of the silicone rubber coating - Influence of AO on the surface chemical compositions of the silicone rubber coatings - Table 1 : AO erosion data, optical transparency, and root mean square roughness (RMS) values for pristine Kapton and silicone rubber-coated Kapton before and after exposure to a variety of AO fluences - Table 2 Surface compositions of the silicone rubber coating before and after AO exposure obtained from XPS data, and corresponding to the central peak position and FWHM DOI : https://doi.org/10.1007/s11998-022-00694-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00694-y.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39307 [article]

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A tunable controlled-release urea fertilizer coated with a biodegradable polyurethane-nanoclay composite layer / Kannika Sitthisuwannakul in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 635-646 Titre : A tunable controlled-release urea fertilizer coated with a biodegradable polyurethane-nanoclay composite layer Type de document : texte imprimé Auteurs : Kannika Sitthisuwannakul, Auteur ; Kanittha Kamonchaivanich, Auteur ; Thanakorn Wirunmongkol, Auteur ; Pennapa Muthitamongkol, Auteur ; Wiyong Kangwansupamonkon, Auteur Année de publication : 2023 Article en page(s) : p. 635-646 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Argile Biodégradation Caractérisation Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Engrais organiques Nanoparticules Polyuréthanes Revêtements -- Propriétés chimiques Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Revêtements organiques Système de libération contrôlée (technologie) Urée Index. décimale : 667.9 Revêtements et enduits Résumé : To minimize a loss of urea to the environment and also control a release activity, a tunable and controlled-release urea fertilizer (TCRF) was created. Composite coating layers of the TCRF were synthesized using a composite of nanoclay (B27), and a linseed oil-modified polyurethane resin (BURNOCK® UL65). The concentration of B27 nanoclay was varied from 0, 3, 5 and 10 wt% and called TCRF, TCRF-3, TCRF-5 and TCRF-10, respectively. Firstly, nanocomposite free-standing films (NFs) with 0, 0.5, 1, 3, 5 and 10 wt% of B27 were synthesized and tested to demonstrate the mechanical properties of the coating layer. When the B27 clay content increased, the Young’s modulus and yield strength were increased. On the other hand, the elongation at break was decreased. NFs were also characterized by XRD and TEM, which showed a partial exfoliated nanocomposite character. The water contact angle measurement showed that all NFs had hydrophobicity properties (87°–90° contact angle). Moreover, the microorganism degradability test showed that the NFs degraded at 37 ± 2°C and 58 ± 2°C in manure, a common agriculture media. The study on coated urea fertilizers found that the thickness of all TCRFs layers is around 52–54 μm. The nitrogen release profiles of the TCRF at 60°C in water as a predictive analytic model were investigated using an elemental analyzer that is a pathway analysis method to understand the release profiles of the TCRFs. All release profiles fitted well with the sigmoidal model, which was suitable for a common plant growth. The profiles gave diffusion coefficients (D) in the range of 49–69 μm2 h−1 and presented an inverse trend to the yield strength of the NFs. The investigation demonstrated that B27 played an important role in tuning the strength of the coating layers that affected the urea release to the plants and the environment. Note de contenu : - MATERIALS AND METHODS : Chemicals - Nanocomposite free-standing films (NFS) preparation - Biodegradability analysis of the NF - Tunable controlled-release urea fertilizer (TCRF) preparation - Characterizations - Nitrogen release test and kinetic study of TCRF - RESULTS AND DISCUSSION : Swelling performance and the characteristics of the nanoclays - Chemical and physical properties of the NF - Biodegradable ability - Nitrogen release mechanism - Table 1 : Mechanical properties and contact angles of NF nanocomposite films - Table 2 : The percentages of biodegradation via the conversion yield of carbon in the sample to carbon dioxide according to the ASTM 5338–98 test method - Table 3 : Kinetic parameters and diffusion coefficients of various types of TCRF DOI : https://doi.org/10.1007/s11998-022-00688-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00688-w.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39308 [article]

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Slippery lubricant-infused intertwining superhydrophobic matrix: preparation and enhanced resistance against abiotic corrosion and microbiologically influenced corrosion / Yinsha Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 647-660 Titre : Slippery lubricant-infused intertwining superhydrophobic matrix: preparation and enhanced resistance against abiotic corrosion and microbiologically influenced corrosion Type de document : texte imprimé Auteurs : Yinsha Wei, Auteur ; Yizhen Yu, Auteur ; Yunxiang Wang, Auteur ; Yuekun Jing, Auteur ; Hongge Gao, Auteur ; Bingzhi Li, Auteur ; Shugang Hu, Auteur ; Ri Qiu, Auteur ; Yibo Ouyang, Auteur Année de publication : 2023 Article en page(s) : p. 647-660 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone Anticorrosifs Anticorrosion Caractérisation Chimie biomimétique Corrosion Essais de brouillard salin Hydrophobie Lubrifiants Métaux -- Revêtements protecteurs Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion of carbon steel (CS) is a disastrous threat to artificial engineering in harsh environments, such as underground mines and seawater environments. Herein, we employed facile one-step electrodeposition to prepare a superhydrophobic intertwining structure on a CS surface in an effort to alleviate corrosion. Sophisticated characterization methods suggested that La tetradecanoate formed during the electrodeposition process via an electrochemical reduction reaction. Silicone lubricant acted as the insoluble phase and was infused into the superhydrophobic matrix to yield a biomimetic slippery lubricant-infused surface (LIS) due to the capillary effect from the superhydrophobic intertwining structure to the lubricant phase. Using natural seawater, salt spray and sulfate-reducing bacteria (SRB) suspension as the harsh media, LIS shows excellent corrosion resistance to the underlying metal compared with bare CS and the superhydrophobic surface covering CS because the oil phase acts as a barrier to inhibit the penetration of corrosive species. For the LIS sample after seawater immersion for 20 d, the Icorr was approximately 2 orders of magnitude smaller than that of the bare CS. In addition, after a 5.0 wt% salt spray test for 20 d, the |Z|0.01 Hz of the LIS surface was ca. 3 orders of magnitude larger than that of CS. Furthermore, when immersed in an extremely harsh SRB suspension for 15 d, the |Z|0.01 Hz of LIS was ca. 3 orders of magnitude larger than that of bare CS because LIS can dually prohibit the bioattachment of SRB and avoid the penetration of the highly corrosive metabolite. Thus, the LIS was proven to have prominent anticorrosion properties in harsh corrosive environments. Note de contenu : - Preparation of SHS and LIS onto CS - Morphology, composition and wettability characterization - Corrosion inhibition measurement in different environments - Evaluation of bio-attachment and corrosion inhibition of the coatings in sulfate-reducing bacteria (SRB) suspension - Table 1 : The electrochemical parameters of bare CS, SHS and LIS revealed by potentiodynamic polarization curves during immersion in seawater - Table 2 : The electrochemical parameters of CS and LIS were revealed by potentiodynamic polarization curves after exposure to 5.0 wt% salt spray for certain periods - Table 3 : The electrochemical parameters of CS and LIS were revealed by potentiodynamic polarization after being immersed in the SRB suspension for certain periods DOI : https://doi.org/10.1007/s11998-022-00698-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00698-8.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39309 [article]

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Constructing robust and magnetic PU sponges modified with Fe3O4/GO nanohybrids for efficient oil/water separation / Dongdong Ge in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 661-670 Titre : Constructing robust and magnetic PU sponges modified with Fe3O4/GO nanohybrids for efficient oil/water separation Type de document : texte imprimé Auteurs : Dongdong Ge, Auteur ; Yun Zhang, Auteur ; Zhenshan Cui, Auteur ; Guilong Wang, Auteur ; Jun Liu, Auteur ; Xiaomeng Lv, Auteur Année de publication : 2023 Article en page(s) : p. 661-670 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants Caractérisation Eponges Hydrophobie Matériaux magnétiques Nanoparticules Oxyde de fer Oxyde de graphène Polyuréthanes Rugosité Index. décimale : 667.9 Revêtements et enduits Résumé : Metal oxides, due to their low cost, environmental friendliness and wide sources, have attracted great attention. We chose iron oxide/graphene oxide (Fe3O4/GO) nanohybrids to modify a PU sponge to increase the surface roughness of the sponge without damaging its inherent structural properties. The composite was then treated with octadecane thiol to reduce the surface energy and produce a superhydrophobic and oleophilic absorption material with a water contact angle of 157°. From the absorption experiment with simulated oily water (including diesel oil, lubricating oil, rapeseed oil, chloroform, N,N-dimethyl formamide, tetrahydrofuran, ethanol and acetone), it was found that the Fe3O4/GO-modified PU sponge could absorb up to 80–170 times its own weight while showing outstanding recyclability achieved by squeeze/absorption cycles. Moreover, the composite absorption material exhibited weak magnetic properties, suggesting its recycling practicability. These results provide a quick and simple strategy to deal with oil spills and chemical leakage. Note de contenu : - EXPERIMENTAL SECTION : Preparation of Fe3O4/GO nanohybrids - Synthesis of the M-PU sponge - RESULTS AND DISCUSSION : Processing of the PU sponge - Characterization of the Fe3O4/GO nanohybrids - Morphology and wettability of the M-PU sponge - Application of the M-PU sponge as an absorbent - Table 1 : The magnetism values of the Fe3O4/GO nanohybrids (a); M-PU sponge (b) DOI : https://doi.org/10.1007/s11998-022-00699-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00699-7.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39310 [article]

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Development of erosion equations for removal of organic coating on carbon fiber reinforced polymer surface by plastic abrasive in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p.671-685 Titre : Development of erosion equations for removal of organic coating on carbon fiber reinforced polymer surface by plastic abrasive Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p.671-685 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Abrasifs Composites à fibres de carbone Equations Matériaux -- Détérioration par érosion Modèles mathématiques Polyuréthanes Prévision, Théorie de la Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Erosion equations were developed to predict the material removal of polyurethane coatings on carbon fiber reinforced plastic (CFRP) surfaces and validated through experimental data. The effects of abrasive properties, process parameters, and organic coating properties (such as fracture toughness and hardness) were considered in the equations. As the erosion angle increased, elastoplastic deformation in the oblique direction and repeated "deformation" in the normal direction were the main reasons for material removal. The ductile erosion behavior was confirmed by experimental data because the maximum erosion rate occurred at an incident angle of 30°. The coefficient and index in the equations were determined by experimental data, and the equations were verified. The developed equations could accurately predict the quantity loss of organic coatings under different particle sizes and particle velocities, and the erosion equations were in good agreement with the experimental data. Note de contenu : - DEVELOPING EROSION EQUATIONS : Modeling of plastic deformation mechanism - Particle rotation analysis - EXPERIMENTAL DETAILS : Abrasive particles and substrate - Coating system - Experimental procedure - RESULTS AND DISCUSSION : Determination of abrasive initial velocity index b - Determination of the coefficient f - Determination of coefficient C C - Determination of coefficient C D - Comparison of the model prediction with experiment - Effect of abrasive particle size - Effect of coating characteristics - Table 1 : Key property indexes of the abrasive - Table 2 : Properties of continuous carbon fiber reinforced plastic composite - Table 3 : Related properties of polyurethane coating - Table 4 : Detailed coating removal experimental conditions - Table 5 : Model coefficients for fatigue index c DOI : https://doi.org/10.1007/s11998-022-00700-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00700-3.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39311 [article]

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Field testing and ecotoxicity of acrylate-based sol–gel coatings in fresh and seawater / Damir Hamulic in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 687-701 Titre : Field testing and ecotoxicity of acrylate-based sol–gel coatings in fresh and seawater Type de document : texte imprimé Auteurs : Damir Hamulic, Auteur ; Ieva Putna-Nimane, Auteur ; Ineta Liepina-Leimane, Auteur ; Inta Dimante-Deimantovica, Auteur ; Peter Rodic, Auteur ; Ingrid Milosev, Auteur Année de publication : 2023 Article en page(s) : p. 687-701 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Algues marines Angle de contact Biodégradation Corrosion Daphnie Ecotoxicologie Essais (technologie) Essais de brouillard salin Essais de résilience Immersion Lixiviation Métaux -- Revêtements protecteurs Mouillabilité Polyméthacrylates Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Siloxanes Les siloxanes sont une classe de composés du silicium dont la formule empirique est R2SiO, où R est un groupe radical qui peut être organique. Des exemples représentatifs sont [SiO(CH3)2]n (diméthylsiloxane) et [SiO(C6H5)2]n (diphénylsiloxane), où n est typiquement supérieur à 4. Ces composés peuvent être des hybrides organiques et inorganiques. Les chaînes organiques confèrent au composé des propriétés hydrophobes alors que la chaîne principale -Si-O-Si-O- est purement inorganique. Le mot siloxane est dérivé de Silicium, Oxygène et alkane. Des siloxanes peuvent être trouvés dans des produits tels que des cosmétiques, des déodorants, des enduits hydrophobes pour pare-brise, des peintures et certains savons. Les siloxanes polymérisés (polysiloxanes) sont appelés silicones1,2. Le siloxane est massivement utilisé dans l'industrie cosmétique (rouges à lèvre, conditionneurs et shampooings, déodorants, etc.). Une application récente du Siloxane D5 (2001) a été trouvée dans le nettoyage à sec des textiles en remplacement du perchloroéthylène. Ce procédé est très répandu aux États-Unis et au Royaume-Uni. Il devient de plus en plus courant en Europe continentale dont la France, afin de promouvoir l'usage de procédés écologiques et respectueux de la santé humaine. Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : We demonstrate a laboratory and field-testing of six siloxane-based coatings to be potentially used as a topcoat paint on structured steel. The coatings were prepared with acrylate monomers of six chain lengths, from methyl to dodecyl. Coated steel samples were immersed in seawater (the Adriatic Sea, 38‰ salinity) and freshwater (the river Ižica) for up to five months to test their properties. The coated samples were tested for possible leaching when exposed to accelerated harsh environmental conditions. The leachate toxicity was examined against microalgae Desmodesmus subspicatus and microcrustacean Daphnia magna. The ethyl and butyl methacrylate coatings provided the best protective properties compared to those with longer chain lengths. The synthesized coatings show less toxicity than commercial biocide-containing coatings. The developed coatings represent a good starting point for an additional upgrade in the system for offshore or similar applications. Note de contenu : - METHODS AND MATERIALS : Preparation of substrate and coatings - Wettability of the coatings - Laboratory corrosion test - Field immersion test - Accelerated leaching test - Ecotoxicological test with Daphnia magna Straus, 1820 - Algae growth test - RESULTS AND DISCUSSION : Wettability of the coating surface - Laboratory salt spray chamber test - Field immersion test - Immersion in Ižica river - Ecotoxicological test - Daphnia magna test - Table 1 : Water contact angle values for hybrid coatings with different lengths of the alkyl chain - Table 2 : The average amount of fouling coverage percentage after immersion of hybrid sol–gel coatings in the Adriatic Sea DOI : https://doi.org/10.1007/s11998-022-00701-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00701-2.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39312 [article]

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Lubricant controlled release silicone fouling release coatings based on mesoporous molecular sieves / Jinhua Lei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 703-711 Titre : Lubricant controlled release silicone fouling release coatings based on mesoporous molecular sieves Type de document : texte imprimé Auteurs : Jinhua Lei, Auteur ; Zhongzheng Li, Auteur ; Tian He, Auteur ; Zhuqian Wang, Auteur ; Shitao Yao, Auteur ; Huayu Qiu, Auteur Année de publication : 2023 Article en page(s) : p. 703-711 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation Lubrifiants Matériaux mésoporeux Revêtements -- Propriétés mécaniques Revêtements antisalissures Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Système de libération contrôlée (technologie) Tamis moléculaires Index. décimale : 667.9 Revêtements et enduits Résumé : Silicone fouling release coatings (FRCs) are biocide-free coatings, and their antifouling performance depends on the nonstick properties and the fouling release behavior. The antifouling performance can be further improved by introducing lubricant into such coatings to form lubricant-infused FRCs (iFRCs). The lubricant will be continuously released to the surface of iFRCs during use, and, in turn, on one hand, the surface of iFRCs will be updated; on the other hand, the attachment of mussels and other organisms will be affected. Inspired by the idea of drug release using porous materials, mesoporous molecular sieves (MMSs), including MCM-41 and SBA-15, were introduced into silicone FRCs in this paper because of their large specific surface area and pore volume. We expected that the release of lubricant could be controlled through MMS in the obtained coatings (iFRC-MMS), so as to obtain FRC with controllable antifouling performance, such as the long-term fouling prevention capacity. Since the release of lubricant usually takes a long time, the effect of MMS on the release of lubricant was studied by an accelerated release test in a good solvent. The surface performance, antifouling performance, and mechanical properties of iFRC-MMS have been studied through the static water contact angle (WCA) measurements, the antidiatom absorption test, and the mechanical performance tests, respectively. Our study demonstrated that: (1) the release of lubricant was indeed affected by MMS in iFRC-MMS as we expected, the release rate can be delayed to a certain extent by both MCM-41 and SBA-15, and (2) there was a compatibility relationship between the pore size of MMS and the molecular size of lubricant, (3) the release of the lubricant was also affected by the molecular weight of lubricant, (4) the intrinsic surface performance and fouling release performance of silicone FRCs were not affected by the introduction of MMS, while the mechanical properties of iFRC-MMS were slightly improved. Note de contenu : - MATERIALS AND METHODS : Reagents - Preparation of lubricant infused MMS (i-MMS) - Preparation of FRC with i-MMS (iFRC-MMS) - Characterization of the distribution of MMS in iFRC-MMS - Accelerated release test of lubricant - Performance tests of iFRC-MMS - RESULTS AND DISCUSSION : Lubricant absorption capacity of MMS - Distribution of MMS in iFRC-MMS - Effect of MMS on lubricant release from iFRC-MMS - Effect of the lubricant viscosity on lubricant release from iFRC-MMS - Effect of MMS on the surface performance of iFRC-MMS - Effect of MMS on the antifouling performance of iFRC-MMS - Effect of MMS on the mechanical properties of iFRC-MMS Table 1 : Mechanical properties of iFRC-MMS DOI : https://doi.org/10.1007/s11998-022-00702-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00702-1.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39313 [article]

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An anti-corrosion coating with self-healing function of polyurethane modified by lipoic acid / Zhentao Cai in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 713-724 Titre : An anti-corrosion coating with self-healing function of polyurethane modified by lipoic acid Type de document : texte imprimé Auteurs : Zhentao Cai, Auteur ; Chunping Li, Auteur ; Daquan Zang, Auteur ; Jin Li, Auteur ; Lixin Gao, Auteur Année de publication : 2023 Article en page(s) : p. 713-724 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Essais de résilience Polyuréthanes Rayures Revêtement autoréparant Revêtements organiques Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethanes (PUs) are a polymer material with a wide range of applications and excellent mechanical properties. In this work, a modified polyurethane coating with the self-healing function is developed via the reaction between polytetrahydrofuran (PTMG), 2,4-toluene diisocyanate (TDI) and α-lipoic acid. The coatings are characterized by SEM and FTIR. The protection of the prepared coating for copper in 3 wt.% NaCl solution is investigated by the electrochemical measurements and the surface self-healing tests. The coating has stable protection from corrosion of the copper substrate in corrosive medium and shows a good self-healing ability. The healing behavior in morphology and corrosion resistance can be observed when heated above 60°C. Note de contenu : - Table 1 : The EIS parameters of copper electrodes with different coatings in 3 wt.% NaCl solution - Table 2 : Polarization curve fitting parameters of the coated electrodes immersed in 3 wt.% NaCl solution for 12 days DOI : https://doi.org/10.1007/s11998-022-00703-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00703-0.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39314 [article]

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Influence of modified graphene oxide on the antifouling performance of waterborne polyurethane coatings containing amphiphilic honeycomb surface / Xu Zhao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 725-740 Titre : Influence of modified graphene oxide on the antifouling performance of waterborne polyurethane coatings containing amphiphilic honeycomb surface Type de document : texte imprimé Auteurs : Xu Zhao, Auteur ; Yuhong Qi, Auteur ; Zhanping Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 725-740 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Formulation (Génie chimique) Oxyde de graphène Polymères amphiphiles Polymères en émulsion Polyuréthanes Revêtements antisalissures Structure en nid d'abeilles Surfaces (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The coating with amphiphilic honeycomb surface containing modified graphene oxide was constructed by a three-step method for improved antifouling properties. Graphene oxide is modified with potassium hydroxide and γ-aminopropyltriethoxysilane, and then the product is dispersed in water and ethanol. Isophorone diisocyanate, polyethylene glycol, and γ-aminopropyltriethoxysilane are used to construct an amphiphilic prepolymer. The honeycomb surface is constructed during the evaporation of water and ethanol and the mixing of the modified graphene oxide and prepolymer. The amphiphilic honeycomb surface gives the coating fouling resistance and fouling release, while the modified graphene oxide gives the coating fouling degradation. The coating’s amphiphilicity, microstructure, and antifouling properties are characterized by the contact angle, confocal laser scanning microscope, scanning electron microscopy, benthic diatom, and bacterial adhesion. The results show that the coatings form an amphiphilic surface with a honeycomb microstructure and exhibit good antifouling properties. The water, diiodomethane, and 1-bromonaphthalene contact angle can be less than 20°. The size and depth of the honeycomb microstructure are about 600 nm and 100–200 nm. Compared with traditional polyurethane and waterborne silicone coatings, the resistance to benthic diatom and bacteria is increased by at least 28 and 400 times, respectively. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of amphiphilic honeycomb coatings containing KGO (KGWPU) - Characterization - RESULTS AND DISCUSSION : Structural properties - Mechanical properties - Amphiphilic properties - Morphological properties - Antifouling properties - Mechanism of antifouling - Table 1 : The basic formulation of KGWPU with varying KGO contents DOI : https://doi.org/10.1007/s11998-022-00704-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00704-z.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39315 [article]

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Synthesis of PET-based urethane-modified alkyd resins from depolymerization intermediates of post-consumer PET bottles: coating properties and thermal behaviors / Cavusoglu Ferda Civan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 741-761 Titre : Synthesis of PET-based urethane-modified alkyd resins from depolymerization intermediates of post-consumer PET bottles: coating properties and thermal behaviors Type de document : texte imprimé Auteurs : Cavusoglu Ferda Civan, Auteur ; Isil Acar, Auteur Année de publication : 2023 Article en page(s) : p. 741-761 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alkyde modifié uréthane Bouteilles en matières plastiques -- Recyclage Dépolymérisation Fourier, Spectroscopie infrarouge à transformée de Matières plastiques -- Déchets Polyéthylène téréphtalate Polymères -- Synthèse Résistance chimique Revêtement de surface Revêtements (produits chimiques) Revêtements -- Propriétés physiques Revêtements -- Propriétés thermiques Revêtements organiques Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Urethane-modified alkyd resins were synthesized using the depolymerization intermediates obtained from simultaneous hydrolysis–glycolysis reactions of post-consumer poly(ethylene terephthalate) (PET) bottles with dipropylene glycol (DPG) and water. For this aim, first, the synthesis of a four-component reference alkyd resin having an oil content of 50% was synthesized by using tall oil fatty acid (TOFA), trimethylolpropane (TMP), phthalic anhydride (PA), and dipropylene glycol (DPG). The PET-based alkyd resins were also synthesized using different amounts and types of purified and fractionated depolymerization intermediates (water-insoluble fraction, WIF, and water-soluble and crystallizable fraction, WSCF) under the same reaction conditions. For the synthesis of PET-based alkyd resins, the depolymerization intermediates were used partially or completely instead of dibasic acid and/or diol components in alkyd resin formulations. In order to determine the optimum modification ratio for urethane-modified alkyd resin synthesis, the reference alkyd resin was reacted with toluene diisocyanate (TDI) at different molar ratios (NCO/OH: 1/1, 1/2, and 1/3), and the optimum NCO/OH ratio was determined as 1/1, according to the surface coating properties. And, then, all PET-based urethane-modified alkyd resins were prepared by the modification reactions of the PET-based alkyd resins with TDI at an optimum ratio. At the end of the study, it was observed that the use of waste PET intermediates (WIF or WSCF) did not cause any negative effects on physical/chemical surface coating and thermal properties ; on the contrary, some properties were obtained as superior than that of the reference resin. In conclusion, it seems possible to use PET-based urethane-modified alkyd resin could be used as a cheap, environmentally friendly, and relatively economic binder component in synthetic paint formulations. In the synthesis of urethane-modified alkyd resin, using a certain amount of waste PET intermediate instead of dibasic acid and/or diol component will reduce raw material costs and also benefit the environment by re-evaluation of recycled PET. Thus, it could be both possible to recycle of post-consumer PET bottles, which are a valuable waste, and to provide cheap raw materials without compromising its features for paint formulations. These results are remarkable in terms of sustainability and waste management besides are also important for the economy and paint industry. Note de contenu : - MATERIALS AND METHODS : Materials - Instruments - Methods - FTIR analyses - Surface coating properties - Thermal analyses - RESULTS AND DISCUSSION : FTIR analysis results - Surface coating tests results - TGA analysis results - Table 1 : Depolymerization reactions conditions and properties of the depolymerization intermediates - Table 2 : Symbols and compositions of the four-component alkyd resins used in the synthesis of the urethane-modified alkyd (UA) resins - Table 3 : Symbols, components, and modification ratios of the urethane-modified alkyd (UA) resins - Table 4 : Drying stages and physical surface coating properties of the reference urethane-modified alkyd (UA) resins - Table 5 : Chemical surface coating properties of the reference urethane-modified alkyd (UA) resins - Table 6 : Drying time test results of the urethane-modified alkyd (UA) resins - Table 7 : Physical surface coating properties of the urethane-modified alkyd (UA) resins - Table 8 : Alkali resistance test results of the urethane-modified alkyd (UA) resins - Table 9 : Acid resistance, salt-water resistance, and environmental resistance test results of the urethane-modified alkyd (UA) resins - Table 10 : Water resistance test results of the urethane-modified alkyd (UA) resins - Table 11: Solvent resistance test results of the urethane-modified alkyd (UA) resins - Table 12 : The temperatures required for reaching certain weight losses (%) DOI : https://doi.org/10.1007/s11998-022-00705-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00705-y.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39316 [article]

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Preparation of PEO/polymer coatings on aluminum alloy with antifouling properties / Ulyana Kharchenko in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 763-779 Titre : Preparation of PEO/polymer coatings on aluminum alloy with antifouling properties Type de document : texte imprimé Auteurs : Ulyana Kharchenko, Auteur ; I. Beleneva, Auteur ; V. Egorkin, Auteur ; I. Vyalyi, Auteur ; N. Izotov, Auteur ; A. T. Tsvetnikov, Auteur ; A. Karpenko, Auteur ; Chi V. Nguyen, Auteur Année de publication : 2023 Article en page(s) : p. 763-779 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries Caractérisation Electrochimie Métaux -- Revêtements protecteurs Microcapsules Polyacryliques Polyènes Polyène est le nom générique des composés organiques polyinsaturés qui possèdent au moins 2 doubles liaisons carbone-carbone et au moins 5 carbones. Polyéthylène glycol Polytétrafluoréthylène Produits naturels Revêtement autopolissant Revêtements -- Propriétés mécaniques Revêtements antisalissures Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : A study on the development of an effective composition of polymeric antifouling coating based on acrylic copolymer with microencapsulated extract of natural origin and superdispersed polytetrafluoroethylene was carried out. A Raman spectroscopy study of the bacterial extract composition showed that the main component was a polyene pigment with 5 conjugated bonds. Encapsulation of ethyl acetate extract of Pseudoalteromonas piscicida 2202 was carried out, two types of microcapsules containing the microbial extract were obtained, and their morphology and efficiency of antifouling action in the coating were studied. Comprehensive studies of antifouling, anticorrosion, and mechanical properties of the coatings allowed identification of the most effective composition providing long-term protection in combination with satisfactory mechanical properties. It is shown that the use of silica nanocapsules with microbial extract in the coating is more effective for enhanced antifouling and mechanical performance. Note de contenu : MATERIALS AND METHODS : Materials - PEO process - Preparation of bacterial extract - Raman spectroscopy of P. piscicida 2202 extract - Encapsulation of P. piscicida 2202 extract in silica nanocapsules and poly(urea–formaldehyde) microcapsules - Preparation of organic topcoat - Field tests - Electrochemical study - Mechanical properties measurements - Surface characterization - RESULTS AND DISCUSSION : Characterization of bacterial extract by Raman spectroscopy - Characterization of SiNCs and PUF-microcapsules - Field immersion - Electrochemical measurements - Mechanical performance of paints - Comparative evaluation of coatings - Table 1 : Table 1 Composition of prepared coatings DOI : https://doi.org/10.1007/s11998-022-00706-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00706-x.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39317 [article]

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Water-based system to prevent the yellowing of opaque coatings on knotted pine wood / Rodrigo Coniglio ; Wolfgang Gaschler ; Leonardo Clavijo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 781-788 Titre : Water-based system to prevent the yellowing of opaque coatings on knotted pine wood Type de document : texte imprimé Auteurs : Rodrigo Coniglio, Auteur ; Wolfgang Gaschler, Auteur ; Leonardo Clavijo, Auteur Année de publication : 2023 Article en page(s) : p. 781-788 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Décoloration Essais accélérés (technologie) Liants Mesure Opacité (optique) Primaire (revêtement) Résistance au jaunissement Revêtements -- Finition Index. décimale : 667.9 Revêtements et enduits Résumé : Water-based opaque coatings used on pine wood show undesired discolorations related to the presence of knots which have an outstanding high concentration of extractives. These compounds, of both polar and nonpolar nature, migrate through the polymeric structure resulting in a yellow–brown spot over the knot. A water-based coating system comprising a polar primer and a nonpolar topcoat proved to have remarkable performance preventing the migration of the extractives and the discoloration of the painted surface. The knot bleeding resistance was tested following EN 927–7. The color of the coating over the knot was measured using CIELab coordinates, and the resulting color difference in comparison with the surrounding paint was in all cases less than the accepted limit for discoloration of opaque coatings. The need to have the combined system to successfully block the whole spectrum of extractives was proved by the evaluation of the individual coatings as well as the utilization of polar dispersions as topcoats. The system presented in this work constitutes a solution to the discoloration of water-based coatings over knotted pine wood. Note de contenu : - MATERIALS AND METHODS : Wood material - Coatings - Coating procedure - Artificial weathering procedure - Discoloration measurement - RESULTS AND DISCUSSION : Performance of a nonpolar binder - Performance of a polar binder - Performance of a system of a polar primer and nonpolar topcoat - Performance of a system of a polar primer and polar topcoats - Table 1 : Hansch parameter for the binders used in this work - Table 2 : Exposure parameters according to EN ISO 4892–2:2006 - Table 3 : Discoloration results of the staining test on 20 boards painted with the binder A - Table 4 : Maximum discoloration measured for boards painted with the binder B as pigmented coating - Table 5 : Discoloration results of the staining test on 20 boards painted with the binder A as primer and the binder B as topcoat - Table 6 : Detail of the systems used to test the performance of a polar primer and polar topcoat - Table 7 : Maximum discoloration measured for boards painted with the systems with polar primer and polar topcoats DOI : https://doi.org/10.1007/s11998-022-00723-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00723-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39318 [article]

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