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A review on predictive tortuosity models for composite films in gas barrier applications / Alamin Idris in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 699-716 Titre : A review on predictive tortuosity models for composite films in gas barrier applications Type de document : texte imprimé Auteurs : Alamin Idris, Auteur ; Adrian Muntean, Auteur ; Beko Mesic, Auteur Année de publication : 2022 Article en page(s) : p. 699-716 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Composites Matériaux -- Propriétés barrières Oxygène Perméabilité Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Different types of impermeable fillers are usually incorporated into polymeric coating film to enhance the gas barrier properties. For instance, impermeable fillers are commonly used in barrier coating due to their larger surface, which in turn serve as barrier inclusions restricting the penetrant gas to diffuse through a longer tortuous pathway. Modeling gas transport in barrier coating can help determine the shelf-life of packaged food and reduce product development resources and time. In this paper, related tortuosity-based models corresponding to different filler geometries are outlined. This review emphasizes the emerging trends in modeling the tortuous pathway and the respective relative permeability model to predict the gas barrier performance in composite films used for barrier coating applications. We review models incorporating a range of factors, including different shapes, geometries, angular orientations, alignments, randomness in distribution, stacking, interspacing, and the polydispersity of fillers. The approaches employed to develop the tortuosity-based phenomenological models starting with simplified filler geometry and orientations to more complex morphological features of the composite films are elaborated. Note de contenu : - Theoretical background - Analytical models for tortuosity : Effects of filler shapes - Effects of filler alignments - Effects of filler spacing - Effects of random arrangement of fillers - Effects of filler orientations - Effects of filler stacking - Effects of filler regimes - Effects of fillers polydispersity DOI : https://doi.org/10.1007/s11998-021-00579-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00579-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38067 [article]

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Recent developments in the anti-graffiti coatings : an attentive review / Shweta Amrutkar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 717-739 Titre : Recent developments in the anti-graffiti coatings : an attentive review Type de document : texte imprimé Auteurs : Shweta Amrutkar, Auteur ; Aarti Purushottam More, Auteur ; Siddhesh Mestry, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2022 Article en page(s) : p. 717-739 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Etudes comparatives Revêtements anti-graffitis Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : An anti-graffiti coating (AGC) is a protective layer applied on the surface (all types including cultural heritage and metallics) to limit possible vandalism phenomena. AGCs are one of the elementary classes of coating materials, creating a barrier layer between substrate and graffiti, preventing the penetration of graffiti into the substrate and helping easy graffiti removal. AGC can be applied on porous and nonporous substrates, including concrete, mortar, stone, granite, metals, etc. AGCs are mainly classified as permanent, semi-permanent, and sacrificial. Sacrificial AGCs include waxes, polysaccharides, and polysiloxane, whereas permanent AGCs include fluorinated polymers, nanoparticles-based coating, silicon, and polyurethanes (PU). The use of hybrid polymers in AGCs containing silane or siloxane and fluoropolymers-based compounds with effective anti-graffiti (AG) properties is an introductory class in the future AGC market. Nowadays, nanotechnology is widely used in AG pretreatment. These polymer chemistries of AGCs find the application on historical walls, public places, trains, houses, etc. The present article focuses on various types of AGCs, their current market trends based on multiple chemistries, mechanisms, and their performance with the structure–property relationships. Note de contenu : - Polysaccharide-based AGCs - Waxes-based AGCs - Fundamental AGCs - Polyurethane (PU)-based AGCs - Acrylic-based AGCs - Fluorinated AGCs - PU-based fluorinated AGCs - Acrylic-based fluorinated AGCs - Silicon-based fluorinated AGCs - Miscellaneous fluorinated AGCs - Silicon-based AGCs - PU-based silicon AGCs - Acrylate-based silicon AGCs - Acrylic-PU silicon hybrid AGCs - Epoxy-based silicon AGCs - Miscellaneous silicon-based AGCs - Polymer composite-based AGCs - Table 1 : Summary of the types of AGC coatings and their advantages and disadvantages DOI : https://doi.org/10.1007/s11998-021-00580-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00580-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38068 [article]

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Preparation and applications of two fluoroalkyl end-capped vinyltrimethoxysilane oligomeric composites possessing superoleophilic/superhydrophobic characteristic : a review / Hideo Sawada in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 741-756 Titre : Preparation and applications of two fluoroalkyl end-capped vinyltrimethoxysilane oligomeric composites possessing superoleophilic/superhydrophobic characteristic : a review Type de document : texte imprimé Auteurs : Hideo Sawada, Auteur Année de publication : 2022 Article en page(s) : p. 741-756 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aromatiques Composés fluorés Fluoropolymères Hydrophobie Oléophilie Oligomères Séparation huile/eau Substances dangereuses -- Elimination Vinyltriméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : Two fluoroalkyl end-capped vinyltrimethoxysilane oligomers [RF-(CH2CHSi(OMe)3)n-RF; RF = fluoroalkyl group] can be synthesized by reaction of fluoroalkanoyl peroxides [RF-C(=O)O-O(O=)C-RF] with vinyltrimethoxysilane under mild conditions. Fluorinated oligomers thus obtained have been applied to the sol-gel reactions in the presence of a wide range of guest molecules (Guest) under non-catalytic, alkaline or acidic conditions to provide the corresponding fluorinated oligomers/Guest composites. Some of these fluorinated composites were found to exhibit a uperoleophilic/superhydrophobic characteristic on their surface, applying to not only the separation of oil and water but also the selective removal of fluorinated aromatic compounds in aqueous solutions. These findings will be reviewed in this article. Note de contenu : - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/PSt and /PTFE composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric composites containing gluconamide unit - Preparation and properties of fluoroalkyl end-capped oligomeric cellulose derivatives composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/alkyl-modified cellulose derivatives composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/cellulose fiber composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/cellulose nanofiber composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/micro-sized silica gel composite - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/cyclodextrin composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/magnetite composites DOI : https://doi.org/10.1007/s11998-021-00598-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00598-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38069 [article]

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Recent progress of self-healing coatings for magnesium alloys protection / N. A. Johari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 757-774 Titre : Recent progress of self-healing coatings for magnesium alloys protection Type de document : texte imprimé Auteurs : N. A. Johari, Auteur ; J. Alias, Auteur ; A. Zanurin, Auteur ; N. S. Mohamed, Auteur ; N. A. Alang, Auteur ; M. Z. M. Zain, Auteur Année de publication : 2022 Article en page(s) : p. 757-774 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Hydrophobie Hydroxydes doubles lamellaires Magnésium -- Alliages Métaux -- Revêtements protecteurs Nanotechnologie Polymères Revêtement autoréparant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : As the lightest structural metal and having a natural ionic presence with compatible biological systems, magnesium (Mg) has been emphasized in vehicle fuel economy for the automobile industry and is appropriate for biodegradable implants. However, the reactive nature of Mg makes it susceptible to corrosion. The electrochemical instability of Mg is due to long-term hydrogen gas evolution, microgalvanic reaction between the matrix and second phase, presence of impurities, and formation of non-protective corrosion product. Many studies have been done to protect Mg and its alloys from corrosion, and one way to prevent direct contact between magnesium substrate and corrosive medium is by applying a stable coating. Protective coating with self-healing properties has become an efficient technique to improve the corrosion resistance of Mg alloys. A self-healing coating can contain released ion exchange of corrosion inhibitors that could improve the coating stability significantly, while coating with embedded nanocontainers is able to autonomously self-heal via stimulus controlled-release upon crack and damages. In this review, recent studies on functional coating with self-healing ability including layered double hydroxides, cerium conversion coating, plasma electrolytic oxidation, graphene oxide coating, and smart self-healing coating are highlighted in the first section. The nanocontainers containing inhibitor coating and self-healing coating with superhydrophobic and biocompatibility function are reviewed afterward. Note de contenu : - FUNCTIONAL COATING WITH SELF-HEALING ABILITY : Layered double hydroxides (LDHs) coating - Cerium conversion coating - Plasma electrolytic oxidation (PEO) - Hybrid PEO-composite coating - Graphene oxide-coating - NANOCONTAINERS CONTAINING INHIBITORS : Mesoporous nanocontainers - Zeolites - Montmorillonite (MMT) clay - Halloysite nanotubes (HNTs) - SELF-HEALING COATING WITH A PARTICULAR PURPOSE : Superhydrophobic/Superamphiphobic coating - Biocompatible self-healing coating - Table 1 : Research development of superhydrophobic coating for Mg alloys and their performance DOI : https://doi.org/10.1007/s11998-021-599-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00599-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38070 [article]

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Natural polyhydroxy resins in surface coatings : a review in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 775-794 Titre : Natural polyhydroxy resins in surface coatings : a review Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 775-794 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Biomatériaux Durée de vie (Ingénierie) Enrobage (technologie) Huile de ricin et constituants Noix de cajou et constituants Polyols Polyuréthanes Revêtements organiques Tanins Index. décimale : 667.9 Revêtements et enduits Résumé : The depletion of fossil fuels, high environmental pollution due to the release of toxic organic compounds, and high cost are some of the challenges regarding the reliance on petroleum-based resins. Natural polyhydroxy resins (from cashew nutshell liquid, castor oil, tannins, among others) are readily available, eco-friendly, low cost, and biodegradable, and offer enhanced properties when deployed on surface coatings. Accordingly, more attention has been paid to utilizing natural polyhydroxy compounds and bio-based polyurethane resins to replace synthetic resins in the last few decades. This review presents state-of-the-art natural polyhydroxy resins and their application as precursors in surface coatings. Bio-based resins from cashew nutshell liquid (cardanol), castor oil, and tannins employed as precursors in bio-based polyurethane coatings exhibit enhanced/excellent impact strength, adhesion, flexibility, water, and chemical resistance, to mention a few. Moreover, natural resins and eco-friendly polyurethane coatings, including their methods of modification, are also reviewed. This review article helps to promote natural polyhydroxy resins as sustainable and promising green materials for the coatings industry. Note de contenu : - Biodegradability of polyhydroxy resin coatings - Oleoresinous varnishes (natural resins) - Cashew nutshell liquid (CNSL) resins in surface coatings : Decorative coatings - Protective coatings - Castor oil : Castor oil resins in decorative coatings - Castor oil resins in protective coatings - Tannin-based resins (in surface coatings) : Tannins in protective coatings - Polyurethane coatings : Polyhydroxy urethane resins in surface coatings - Modification of bio-based precursors as intermediates for PU coatings - Life cycle assessment of bio-based precursors in surface coatings - Drawbacks of polyhydroxy resin coatings and solutions - Table 1 : Application of CNSL resins in surface coatings - Table 2 : Mechanical and thermal properties of castor-oil based biopolymers/resins - Table 3 : 1K and 2K product PU coatings - Table 4 : Bio-based precursors modification procedures, application, and properties of PUs DOI : https://doi.org/10.1007/s11998-021-00604-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00604-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38071 [article]

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Amphiphilic marine coating systems of self-stratified PDMS-PEG surfaces with an epoxy-polyurethane matrix / AliReza Rahimi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 795-812 Titre : Amphiphilic marine coating systems of self-stratified PDMS-PEG surfaces with an epoxy-polyurethane matrix Type de document : texte imprimé Auteurs : AliReza Rahimi, Auteur ; Morgan Murphy, Auteur ; Kinza Faiyaz, Auteur ; Shane J. Stafslien, Auteur ; Lyndsi J. Vander Wall, Auteur ; Madhura Pade, Auteur ; John A. Finlay, Auteur ; Anthony S. Clare, Auteur ; Dean C. Webster, Auteur Année de publication : 2022 Article en page(s) : p. 795-812 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Carbamate de glycidyle Copolymère silicone-uréthane Epoxydes Essais (technologie) Formulation (Génie chimique) Revêtements antisalissures Revêtements autostratifiants Revêtements organiques Salissures biologiques Statistique Index. décimale : 667.9 Revêtements et enduits Résumé : Marine coatings protect submerged surfaces from the negative effects of biofouling. In this work, we demonstrate a new method to prepare self-stratified, amphiphilic glycidyl-carbamate (GC)-based (epoxy urethane-based) coatings (AmpSiGC coatings) that have fouling-release properties making them suitable for marine use. The prepared coating systems are unique and durable in character as the bulk coating takes advantage of both epoxy and urethane functionalities while the surface is comprised of both hydrophilic and hydrophobic domains, granting it an amphiphilic characteristic. The experimental approach aimed to evaluate several factors that influence coating performance, including molecular weight of poly (ethylene glycol) (PEG) and PDMS moieties, ratio of hydrophobic (PDMS) and hydrophilic (PEG) components in the system, and the effect of different curing agents. The results demonstrated that polymeric chains of 10,000 Mn PDMS and 750 Mn PEG at 10–15 wt.% each offer substantially improved or comparable fouling-release performance in comparison to commercial marine coatings. This paper reports on the facile synthesis and characterization of the GC resin and GC prepolymers using FTIR and epoxy titrations ; surface characterization of the coatings using ATR-FTIR, XPS, and AFM; and fouling-release assessment of the surfaces using laboratory biological assays with the barnacle Amphibalanus amphitrite, the algae Ulva linza and Navicula incerta, and the bacteria Cellulophaga lytica. Several of the AmpSiGC coatings exhibited promising performance, which were better or comparable to the internal and commercial reference coatings. The performance of the systems was dependent on all of the factors considered in this study. Note de contenu : - Materials - Design of experiments - Synthesis of glycidyl-carbamate resin - Synthesis of amphiphilic glycidyl-carbamate prepolymers - Epoxy equivalent weight titrations - Percent solids determination - Fourier transform infrared spectroscopy - Coating formulation and curing - Surface characterization - Biological laboratory assays - Statistical analysis - Table 1 : Coating compositions - Table 2 : Epoxy equivalent weight for GC resin and some prepolymers DOI : https://doi.org/10.1007/s11998-021-00561-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00561-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38072 [article]

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Fabrication and multifunctional properties of fluorine-free durable nickel stearate based superhydrophobic cotton fabric / Malobi Seth in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 813-827 Titre : Fabrication and multifunctional properties of fluorine-free durable nickel stearate based superhydrophobic cotton fabric Type de document : texte imprimé Auteurs : Malobi Seth, Auteur ; Sunirmal Jana, Auteur Année de publication : 2022 Article en page(s) : p. 813-827 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Antifongiques Caractérisation Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Enduction textile Hydrophobie Séparation huile/eau Stéarate de nickel Textiles et tissus auto-nettoyants Index. décimale : 667.9 Revêtements et enduits Résumé : A fluorine-free superhydrophobic cotton fabric based on nickel stearate with multifunctional properties has been fabricated by a two step simple solution process. The cotton fabric (aNS-CF) exhibits static water contact angle, ~ 160°, and water shedding angle, < 10°, due to in-situ formation of hierarchical (micro and nano) broccoli-like structures of nickel stearate. The superhydrophobic cotton fabric, having superoleophilic property, has been used for separation of a series of light/heavy oil–water mixtures, and ~ 99% separation efficiency has been achieved after 10 cycles of separation process and it has been found to be slightly reduced to ~ 98% after 50 cycles. Antifouling and self-cleaning performance of the fabric has been evaluated effectively using solid and liquid contaminants as well as some common food liquids. The coating exhibits significant mechanical and chemical robustness and laundering durability in harsh conditions. The coated fabric possesses antibacterial (gram-negative E. coli and gram-positive S. aureus) and antifungal (C. albicans) properties leading to ~ 99.99% reduction in microbial growth, which has been remarkably sustained after 50 cycles of washing, abrasion and separation of oil–water mixtures. The stable multifunctional properties of the fabric exhibits a great potential towards a huge domain of practical implementations in smart textiles. Note de contenu : - EXPERIMENTAL : Materials - Fabrication of nickel stearate coating - Oil-water separation - Antimicrobial activity - Durability of coating - Characterizations - RESULTS AND DISCUSSION : Phase structure - Surface morphology - Chemical bonding - Superwetting behavior - Stability of nickel stearate coating - Oil-water separation - Antimicrobial activity - Table 1 : Comparison of the durability of superhydrophobic aNS-CF with the reported works DOI : https://doi.org/10.1007/s11998-021-00559-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00559-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38073 [article]

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Antibacterial noncytotoxic chitosan coatings on polytetrafluoroethylene films by plasma grafting for medical device applications / Juliana M. Vaz in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 829-838 Titre : Antibacterial noncytotoxic chitosan coatings on polytetrafluoroethylene films by plasma grafting for medical device applications Type de document : texte imprimé Auteurs : Juliana M. Vaz, Auteur ; Thiago B. Taketa, Auteur ; Jacobo Hernandez-Montelongo, Auteur ; Larissa M. C. G. Fiúza, Auteur ; Cristiano Rodrigues, Auteur ; Marisa M. Beppu, Auteur ; Rodrigo S. Vieira, Auteur Année de publication : 2022 Article en page(s) : p. 829-838 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Caractérisation Chitosane Le chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes. Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique. Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine. Dispositifs médicaux Greffage (chimie) Polytétrafluoréthylène Revêtements organiques Surfaces fonctionnelles Technique des plasmas Index. décimale : 667.9 Revêtements et enduits Résumé : Chitosan is an exciting alternative for the development of coating-surfaces due to its large action spectrum against pathogenic microorganisms. However, to produce a stable coating with effective antibacterial action, a compromise between deacetylation degree (DD) and molecular weight (MW) is essential. Four chitosan samples were characterized regarding Mw and DD and correlated with the minimum and bactericide concentrations against E. coli, P. aeruginosa, and S. aureus. CHI80MW (79.7% DD and 7.0 × 105 Da) showed the best antibacterial effect and was selected to functionalize polytetrafluoroethylene (PTFE) surfaces by plasma. CHI80MW was grafted onto the PTFE surfaces using two different spacer molecules: poly(ethylene glycol) bis (carboxymethyl) ether (PEG) and poly(ethylene-alt-maleic anhydride) (PA). PTFE-Plasma-PA-CHI80MW exhibited a coating with more attached chitosan and better antibacterial action if compared to PTFE-Plasma-PEG-CHI80MW: after 8 h, PTFE-Plasma-PEG-CHI80MW presented a bacterial reduction of 25-30% for the three bacterial strains, and PTFE-Plasma-PA-CHI80MW reduced them to 77-90%. Moreover, cytotoxicity tests showed that PTFE-Plasma-PA-CHI80MW samples were compatible with human fibroblasts. Note de contenu : - Materials and methods - Results and discussion : Characterization: chitosan powder samples - Surface characterization: concentration of chitosan on the functionalized PTFE surfaces by plasma-grafting - Biological assays - Table 1 : Values acquired of degree of deacetylation (DD) and molecular weight (Mw) for chitosans 80% DD, low Mw (CHI80LW), 75% DD and intermediate Mw (CHI75IW), 85% DD and intermediate Mw (CHI85IW), and 85% DD and medium Mw (CHI80MW) DOI : https://doi.org/10.1007/s11998-021-00560-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00560-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38074 [article]

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Siloxane coating with epoxy modification : optimization of adhesion to improve steel corrosion protection / M. Barletta in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 839-849 Titre : Siloxane coating with epoxy modification : optimization of adhesion to improve steel corrosion protection Type de document : texte imprimé Auteurs : M. Barletta, Auteur ; P. Moretti, Auteur ; E. Pizzi, Auteur ; F. Trovalusci, Auteur Année de publication : 2022 Article en page(s) : p. 839-849 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. Anticorrosifs Anticorrosion Caractérisation Epaisseur -- Mesure Epoxydes Matériaux hybrides Métaux -- Revêtements protecteurs Procédés de fabrication Revêtements organiques Rugosité 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 : This study focuses on the possibility of using siloxane resins with epoxy modification to delay corrosion of metal substrates for hydraulic applications. Formulations aimed at metal protection were designed, without including anticorrosive additives, and deposited on 11SMnPb37 steel. Thin monolayer films were obtained by dip coating in different process conditions, avoiding primers. The developed procedure was simple and able to provide solid and well-anchored coatings. They were characterized in terms of morphology, scratch and wear endurance, and resistance to a corrosive environment. The optimum formulation and deposition parameters were found. The selected coating showed remarkable adhesion to the substrate, good mechanical properties, and resistance in a saline environment, proving to be suitable as a protective barrier against corrosion. The protective effect was ensured not by additives but through the excellent adhesion of the coating and its endurance to scratch and wear. Note de contenu : - Materials and manufacturing process - Characterization procedure - Table 1 : Coatings developed in the experiments - Table 2 : Mean thickness values of the coatings obtained in various conditions according to Table 1 (alkaline pretreatment of the support or absence, resin concentration, extraction speed) - Table 3 : Measured roughness (Ra and Rz) of uncoated sample and selected coatings, AC3S10, AC3S100, C3S10, and C3S100 DOI : https://doi.org/10.1007/s11998-021-00594-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00594-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38079 [article]

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Synthesis of polyaniline on functionalized TiO2 using two-container type in situ coating technique / Marco Miguel P. Parel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 851-857 Titre : Synthesis of polyaniline on functionalized TiO2 using two-container type in situ coating technique Type de document : texte imprimé Auteurs : Marco Miguel P. Parel, Auteur ; Ivy R. Columbo, Auteur ; Marvin U. Herrera, Auteur Année de publication : 2022 Article en page(s) : p. 851-857 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Enrobage (technologie) Matériaux -- Propriétés fonctionnelles Polyacrylonitrile Polymères -- Synthèse Polymérisation Réaction de couplage Revêtements organiques Silane-aniline Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis of polyaniline on functionalized TiO2 using two-container type in situ coating technique The possibility of coating polyaniline molecules onto functionalized TiO2 particles was explored using two-container type in situ coating technique. The TiO2 particles were functionalized by silane–aniline molecules as linker between the TiO2 and polyaniline molecules. The precursor and oxidizing agent were placed in two separate containers during polymerization to minimize aggregation of polyaniline molecules in the bulk of the solution. Peaks detected from the infrared spectra possess the vibrational peaks associated with the synthesized polyaniline molecules coating onto the silane–aniline functionalized TiO2. A possible configuration was constructed to illustrate the coexistence of different structures as a result of the synthesized polyaniline molecules onto the functionalized TiO2 surface. Morphology of the samples using SEM with EDX mapping shows the uniform distribution of Ti and Si atoms throughout the sample. By utilizing the two-container type in situ coating technique, polyaniline molecules were successfully coated onto the surface of TiO2 particles using silane–aniline as coupling agent. Note de contenu : - Table 1 Peaks obtained from (a) silane–aniline functionalized TiO2 and (b) polyaniline-coated silane–aniline functionalized TiO2 with respect to TiO2 using FTIR DOI : https://doi.org/10.1007/s11998-021-00562-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00562-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38080 [article]

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Influence of deposition parameters on the behavior of nitro-cobalt-based and Ti-hexafluoride-based pretreatments / A. Cristoforetti in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 859-873 Titre : Influence of deposition parameters on the behavior of nitro-cobalt-based and Ti-hexafluoride-based pretreatments Type de document : texte imprimé Auteurs : A. Cristoforetti, Auteur ; M. Fedel, Auteur ; F. Deflorian, Auteur ; S. Rossi, Auteur Année de publication : 2022 Article en page(s) : p. 859-873 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. Adhésion Coil coatings Essais accélérés (technologie) Essais de brouillard salin Galvanisation Revêtement de conversion Revêtements:Peinture Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Two different chemical pretreatments for hot-dip galvanized steel, typically used in the coil coating field, were considered comparing their electrochemical behavior (electrochemical impedance spectroscopy (EIS), potentiodynamic curves) after a morphological characterization of the deposited films. The wet and dry adhesion of the following deposited paint is tested employing neutral salt spray chamber test (NSST) and pull-off test. Despite these technologies being widely adopted in industrial plants, the literature lacks some relevant research about the actual improvement in durability, especially in the case of nitro-cobalt based conversion. This paper analyzes the factors affecting the protection provided by the deposited film and varying the principal production parameter, the immersion time in the chemical conversion solution, an optimization study was carried out. The better behavior of the titanium hexafluoride-based artificial conversions, with respect to the nitro-cobalt one, is highlighted. Such treatment analyzed as bare surface gives higher impedance modulus and lower corrosion current density compared to the second one. For both the technologies, the uselessness of longer treatment periods in terms of performance improvement is found. The results obtained from the electrochemical characterization are in accordance with the technological test on the painted samples, such as NSST, where the delamination rate is significantly higher for the substrate treated employing a nitro-cobalt-based bath. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS - RESULTS AND DISCUSSION : Morphology and composition - Free corrosion potential trend - Impedance spectra - Potentiodynamic polarization curves - Neutral salt spray chamber test, adhesion of painted samples - Table 1 : Sample's production parameters and corresponding code - Table 2 : Comparison between surface and cluster composition by EDXS analysis on T-300 sample - Table 3 : Numerical data obtained from electrochemical measurements carried out in aerated conditions DOI : https://doi.org/10.1007/s11998-021-00563-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00563-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38081 [article]

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Efficacy and mechanism of GO/IBTS coating against microbial fouling of concrete surfaces in marine tidal areas / Shaochun Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 875-885 Titre : Efficacy and mechanism of GO/IBTS coating against microbial fouling of concrete surfaces in marine tidal areas Type de document : texte imprimé Auteurs : Shaochun Li, Auteur ; Jun Liu, Auteur ; Yongjuan Geng, Auteur ; Ang Liu, Auteur ; Ailing Xu, Auteur ; Dongshuai Hou, Auteur ; Xiulu Lang, Auteur Année de publication : 2022 Article en page(s) : p. 875-885 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion microbienne Isobutyltriethoxysilane Matériaux cimentaires Oxyde de graphène Revêtements antisalissures Revêtements organiques Silanes Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, GO/IBTS composite emulsion was prepared by sol–gel method with graphene oxide (GO) and isobutyltriethoxysilane (IBTS) as raw materials. GO/IBTS composite coating was constructed on the surface of concrete blocks, which were then placed in a marine tidal area for biological fouling experiment. The results show that the GO/IBTS composite emulsion can ensure long-term hydrophobicity of the concrete surface, preventing the adhesion of marine microorganisms and effectively inhibiting the formation of microbial biofilms. High-throughput DNA sequencing results show that the GO/IBTS composite coating can reduce the species richness and community diversity of microorganisms on the concrete surface, especially the abundance of Desulfobacterota and Firmicutes species, which can corrode concrete. The degree of microbial contamination was significantly reduced, and the bacterial community structure was improved by the coating. Microscopy results show that the GO/IBTS composite coating reduces the degree of carbonization of concrete, improves the microstructure of the concrete surface, and reduces the degree of microbial contamination on concrete. Note de contenu : - MATERIALS AND METHODS : Raw materials and preparation of a GO/IBTS composite emulsion - Concrete preparation - Contact angle measurements - Microbial extraction from concrete surfaces - Illumina MiSeq sequencing and data analysis - Analysis of biofilms on the concrete surface - pH values of the concrete surface and analysis of the corrosion product composition - Analysis of the micromorphology of the concrete surface - RESULTS AND DISCUSSION : Influence of the GO/IBTS composite coating on the contact angle of the concrete surface - Influence of the GO/IBTS composite coating on the microbial α-diversity indices for the concrete surface - Influence of the GO/IBTS composite coating on the composition of the microbial community of the concrete surface Influence of the GO/IBTS composite coating on the adhesion of bacteria to the concrete surface - The influence of the GO/IBTS composite coating on the phase composition of the concrete surface The influence of the GO/IBTS composite coating on the surface micromorphology of concrete - Table 1 : Raw materials for the preparation of GO/IBTS composite emulsions - Table 2 : Mixing ratios of prepared concrete (kg/m3) - Table 3 : Bacterial α-diversity indices for the concrete surface - Table 4 : pH values of the concrete surfaces DOI : https://doi.org/10.1007/s11998-021-00565-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00565-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38082 [article]

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Preparation and characterization of self-crosslinking acrylate emulsion modified by divinyl silane / Xiaolong Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 887-895 Titre : Preparation and characterization of self-crosslinking acrylate emulsion modified by divinyl silane Type de document : texte imprimé Auteurs : Xiaolong Chen, Auteur ; Shusen Cao, Auteur ; Wangting Zhao, Auteur ; Lijun Chen, Auteur Année de publication : 2022 Article en page(s) : p. 887-895 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate d'hydroxyéthyle Auto-réticulation Caractérisation Emulsifiants Granulométrie Latex Polyacrylates Réticulants en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : The divinyl silane modified self-crosslinking polyacrylate latex was successfully prepared by semicontinuous seeded emulsion polymerization. Methyl methacrylate (MMA) and butyl acrylate (BA) were used as main monomers and the reaction was initiated by potassium persulfate (KPS). The modified monomer 1, 3-divinyltetramethyldisiloxane (DVMS) and crosslinked monomer hydroxyethyl acrylate (HEA) were introduced into the basic dispersion. Sodium dodecyl sulfonate (SDS) anionic surfactant and alkyl polyglycoside (APG) nonionic emulsifier were utilized as composite emulsifiers. The structure of latex film was characterized by Fourier transform infrared spectroscopy (FTIR). The latex films were tested by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and contact angle (CA) and apparent crosslinking percentage. The particle size of the emulsion was measured by Zetatrac dynamic light scattering instrument. The optimum conditions are as follows: the amount of composite emulsifier is 5.0%, the mass ratio of SDS to APG is 1:1, the amount of initiator is 0.5%, the amount of DVMS is 5.0%, and the amount of HEA is 1.0%. The emulsion has good mechanical stability and chemical stability, and the storage stability is ideal. The dispersion is blue and translucent, with a small particle size. The apparent crosslinking percentage of the latex film is above 89%, and the highest contact angle was more than 98°. The polyacrylate colloidal film prepared in this paper has outstanding thermal stability and hydrophobicity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of self-crosslinking acrylic latex and its film - Characterizations - RESULTS AND DISCUSSION : FTIR and DSC film analysis of the films - Influence of amount of initiator on conversion percentage and coagulation percentage - The effect of functional monomers on the apparent crosslinking percentage - Water absorption and contact angle of film - Thermal properties of the prepared latex films - Table 1 : Recipe of self-crosslinking acrylic latex - Table 2 : Influence of mass ratio of emulsifier on properties of latex - Table 3 : Particle size of latex DOI : https://doi.org/10.1007/s11998-021-00566-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00566-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38083 [article]

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Preparation and characterization of hydrogen-containing silicone oil-modified polyurethane/Al composite coating with low-infrared emissivity / Weigang Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 897-905 Titre : Preparation and characterization of hydrogen-containing silicone oil-modified polyurethane/Al composite coating with low-infrared emissivity Type de document : texte imprimé Auteurs : Weigang Zhang, Auteur ; Si Xiong, Auteur ; Dandan Lv, Auteur Année de publication : 2022 Article en page(s) : p. 897-905 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Caractérisation Dioxyde de silicium Emissivité En transfert radiatif, l'émissivité correspond au flux radiatif du rayonnement thermique émis par un élément de surface à température donnée, rapporté à la valeur de référence qu’est le flux émis par un corps noir à cette même température. Cette dernière valeur étant la valeur maximale possible, l'émissivité est un nombre inférieur ou égal à l'unité. (widipedia) Hydrophobie Nanoparticules Polyuréthanes Poudres métalliques Rayonnement infrarouge Revêtement auto-nettoyant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The goal of this research was to obtain a coating with low-infrared emissivity and both good hydrophobic and mechanical properties. Using nano-SiO2 as the micro-nano structural modifier, a hydrogen-containing silicone oil (HCSO)-modified polyurethane (PU)/Al composite coating with super-hydrophobicity and low-infrared emissivity was prepared via a simple glass rod scraping method. Effects of the ratio of HCSO to PU, the total filler addition, and the ratio of Al powder and nano-SiO2 on the coating properties are systematically discussed. The results show that as the ratio of HCSO to PU increases, the surface energy of the coating decreases, and this significantly increases the hydrophobicity of the coating. When the ratio is 2:8, the coating has outstanding hydrophobic properties, the adhesion strength of the coating reaches grade 1, and the water contact angle (WCA) reaches 152°. The total filler addition has a significant impact on the coating performance. With an increase in the filler addition, the emissivity of the coating increases, and the glossiness decreases. When the total filler addition is 50 wt%, the coating surface forms an obvious papillary micro-nano rough structure, so that the coating has outstanding hydrophobic properties. The ratio of Al powder to nano-SiO2 obviously affects the emissivity and hydrophobic properties of the coating. When the ratio is 5.5:4.5, the coating has good overall performance. At this point, the emissivity of the coating is as low as 0.675; the glossiness and adhesion strength are 2.7 and grade 1, respectively; the WCA and sliding angle are 155° and 8°, respectively; and it has outstanding self-cleaning performance. Through the research in this paper, a low-infrared emissivity coating with outstanding super-hydrophobic properties and adhesion strength has been obtained and has important application value in the design and transformation of infrared stealth of various equipment. Note de contenu : - EXPERIMENTAL : Materials - Preparation of HCSO-modified PU/Al composite coating - Characterization - RESULTS AND DISCUSSION : Effects of ratio of HCSO to PU on coating performance - Effects of total filler addition on coating performance - Effects of ratio of Al powder to nano-SiO 2 on coating performance - Table 1 : Performance indicators of the coatings with different ratios of HCSO to PU - Table 2 : Performance indicators of the coatings with different amounts of fillers - Table 3 : Performance indicators of the coatings with different ratios of Al powder to nano-SiO2 DOI : https://doi.org/10.1007/s11998-021-00567-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00567-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38084 [article]

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Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics / Qiuping Su in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 907-917 Titre : Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics Type de document : texte imprimé Auteurs : Qiuping Su, Auteur ; Zilun Tang, Auteur ; Jiajian He, Auteur ; Yuxin Gu, Auteur ; Yong Li, Auteur ; Jing Xie, Auteur ; Shaoshun Wang, Auteur ; Ruijun Lin, Auteur ; Xiaofeng Lin, Auteur ; Wenjing Lin, Auteur ; Guobin Yi, Auteur Année de publication : 2022 Article en page(s) : p. 907-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cinétique chimique Composés organiques -- Synthèse Morphologie (matériaux) Polyesters Polymérisation Réticulants Revêtements organiques Revêtements poudre Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) was synthesized by a new two-step method without using harmful epichlorohydrin and served as a curing agent for polyester powder coatings. The chemical structure of TOTC was determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The curing behavior and the curing reaction kinetics of TOTC/polyester resin (NH-3307) system were studied by dynamic differential scanning calorimetry. The activation energy Ea was 71.75 kJ mol-1 according to Flynn–Wall–Ozawa method, and the curing reaction of TOTC/NH-3307 system was described by Friedman method. It was found that the curing reaction of TOTC/NH-3307 system was a two-parameter autocatalysis which followed the Å estάk–Berggren model. The nonisothermal curing reaction rate was simulated according to the Å estάk–Berggren model and the experimentally parameters. What is more, the thermogravimetric analysis results showed that the TOTC/NH-3307 system had good thermal stability with an initial decomposition temperature of 374.92°C. The TOTC/NH-3307 cured film exhibited excellent leveling performance by SEM. The results demonstrated that TOTC has efficient curing ability and huge market potential. Note de contenu : - Experimental : Materials - Methods : Synthesis of triallyl benzene-1,3,5-tricarboxylate (TATC) - Synthesis of tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) - Preparation of powder coatings - Characterization and instrumentation - Results and discussion : Synthesis and characterization of TOTC - Curing kinetics and mechanism analysis : Nonisothermal DSC cure - Curing kinetics - Curing mechanism - Thermal stability analysis - Surface morphology analysis - Table 1 : Characteristic parameters of TOTC/NH-3307 powder coating system - Table 2 : Characteristic peak conversion values and calculated kinetic parameters for autocatalytic model at different heating rates DOI : https://doi.org/10.1007/s11998-021-00578-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00578-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38085 [article]

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Investigation of effect of type of pigment/extender on the stability of high pigment volume concentration water-based architectural paint / Ritesh A. Bhavsar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 919-930 Titre : Investigation of effect of type of pigment/extender on the stability of high pigment volume concentration water-based architectural paint Type de document : texte imprimé Auteurs : Ritesh A. Bhavsar, Auteur ; Avinash Sardesai, Auteur Année de publication : 2022 Article en page(s) : p. 919-930 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Charges (matériaux) Concentration pigmentaire volumique Diluants Dispersions et suspensions -- Stabilité Floculation Pigments inorganiques Potentiel zeta Revêtements en bâtiment:Peinture en bâtiment Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This article elucidates the effect of type of pigment/extenders viz. titanium dioxide (TiO2), magnesium silicate (steatite), calcium carbonate, dolomite, precipitated sodium magnesium aluminosilicates, hydrated and calcined aluminum silicates (kaolin) when used alone or in combination in the paint dispersions on their sedimentation stability. Accelerated heat age stability test was conducted as per ASTM D 1849. Wettability of pigment extenders were measured in terms of their contact angle using Washburn technique. Rheology viscosity curve and oscillatory amplitude sweep test are carried out to depict the structural properties, more precisely the extent of flocculation in the paint dispersion. From rheology viscosity curve, extent of residual flocculation is determined using Asbeck extrapolation method. Extent of total flocculation in the paint dispersion is estimated from cohesive energy density (Ec) using oscillatory amplitude sweep test. Energy of separation of particles in flocs (Esep) is also determined using yield point measurement. Attempt was made to correlate extent of flocculation present in paint dispersion with settling and syneresis observed during accelerated heat age stability test. It is observed that, the paint dispersions based on only TiO2, only hydrous kaolin and only precipitated sodium magnesium aluminosilicates are found to be quite stable whereas the dispersions based on only magnesium silicates and only calcined kaolin are found to be unstable. Paint dispersions based on carbonate extenders show syneresis and soft settling which is easily mixable. From the rheological study, it is identified that Ec is the most crucial parameter that correlates very well with the accelerated heat age stability test results of paint dispersion. Note de contenu : - EXTENT OF FLOCCULATION : Investigation of degree of residual flocculation using Asbeck extrapolation method - Energy of separation between the particles in a flocs (E sep) - Cohesive energy density (E c) - EXPERIMENTAL WORK : Materials - Preparation of dispersion - Characterization - RESULTS AND DISCUSSION : Effect of type of pigment/extenders on the stability of high PVC interior paint - Powder wettability - Rheological characterization - Effect of varying ratio of unstable to stable pigment and extenders on the stability of Paint-1 - Table 1 : Physico-chemical properties of pigments and extenders used in paint dispersion - Table 2 : Key formulation ingredients of high PVC interior paint-1 and their respective experiments with individual pigment/extender at same volume solid content - Table 3 : Summary of pH, zeta potential, stormer viscosity of paint dispersions before and after accelerated heat age stability test - Table 4 : Material constant and powder contact angle with DI water and surfactant solution - Table 5 : Infinite shear viscosity (η∞) and the extent of residual flocculation (m) as computed from Asbeck model, yield point (τ0) and energy of separation of particles in floccs (Esep), viscoelastic parameter G′ and critical strain (Υc) and cohesive energy density (Ec) is summarized DOI : https://doi.org/10.1007/s11998-021-00568-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00568-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38086 [article]

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Influence of pigment and binder composition on the dynamic water penetration and dried structure of precoating layers for double-coated paper / Hye Jung Youn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 931-938 Titre : Influence of pigment and binder composition on the dynamic water penetration and dried structure of precoating layers for double-coated paper Type de document : texte imprimé Auteurs : Hye Jung Youn, Auteur ; Hak Lae Lee, Auteur Année de publication : 2022 Article en page(s) : p. 931-938 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couleur Enrobage (technologie) Formulation (Génie chimique) Humidité -- Absorption:Eau -- Absorption Liants Papier -- Revêtements Papier et carton couché Pigments Rayonnement ultraviolet -- Absorption Revêtements -- Analyse Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : The influence of precoating colors on the dynamic water penetration behavior of double-coated paper was investigated using a laboratory coater equipped with two coating heads. Emphasis was placed on the effects of the pigment combination and binder type on dynamic water penetration. In addition, the latex content on the surface of the coating layer was examined by UV absorbance analysis. The amount of water that penetrated the base paper was found to be proportional to the square root of the contact time between the coating color and the base paper, regardless of the pigments and binders used. When a large amount of pigment with a fine particle size was used, or the starch binder content was increased, the low shear viscosity of the coating color increased, and the amount of water penetration into the base paper decreased. The UV absorbance analysis showed that higher water holding in the coating color increased the latex content on the surface of the coating layer. Increasing the viscosity or water retention of the coating color was found to reduce the amount of binder migration into the base paper. Note de contenu : - EXPERIMENTAL SECTION : Materials - Coating formulation - Coating and drying - Coating analysis - RESULTS AND DISCUSSION : Dynamic absorption of coating color - Pore structure of the precoating layer - Surface properties of precoating layer - Table 1 : Precoating color formulations in parts per hundred - Table 2 : Properties of precoating color as a function of pigment mixing ratio - Table 3 : Properties of precoating color as a function of the binder mixing ratio - Table 4 : Structural parameters of precoated layers as a function of pigment composition - Table 5 : Structural parameters of precoated layers as a function of pigment mixing ratio - Table 6 : Surface properties of precoated layers as a function of pigment composition and pigment mixing ratio - Table 7 : Precoated layer UV absorbance and water absorption into the base paper DOI : https://doi.org/10.1007/s11998-021-00569-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00569-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38087 [article]

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The enhanced surface properties of geopolymer inorganic coatings by adding with MgO / Xueting Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 947-957 Titre : The enhanced surface properties of geopolymer inorganic coatings by adding with MgO Type de document : texte imprimé Auteurs : Xueting Liu, Auteur ; Ying Fan, Auteur ; Yuan Li, Auteur ; Wenkui Liu, Auteur ; Jingjing Wu, Auteur ; Changming Liu, Auteur ; Bin Yang, Auteur ; Zhicheng Pang, Auteur Année de publication : 2022 Article en page(s) : p. 947-957 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Géopolymères Les géopolymères sont la réciproque des polymères organiques. À la place de dérivés du pétrole et de la chaîne carbonée, on utilise de la matière minérale composée de silice et d’alumine. Les géopolymères sont basés sur des alumino-silicates désignés sous le terme poly(sialate), qui est une abréviation de poly(silico-oxo-aluminate) ou (-Si-O-Al-O-)n (soit n le degré de polymérisation). La structure chimique de la Figure 1 montre un géopolymère poly(sialate-siloxo) résultant d'une géosynthèse de poly(silisique) acide (SiO2)n et de potassium alumino-silicate, en milieu alcalin (KOH, NaOH). Dans cette structure, le groupement sialate (Si-O-Al-O-) est un agent de réticulation. On pense que le mécanisme de la synthèse géochimique se fait par l'intermédiaire d'oligomères (dimère, trimère) qui constituent les véritables groupements structuraux unitaires formant une structure macromoléculaire tridimensionnelle. Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Oxyde de magnésium L'oxyde de magnésium, communément appelé magnésie, a pour formule MgO et se présente sous la forme de poudre blanche très fortement basique absorbant l'eau et le dioxyde de carbone présents dans l'atmosphère. STRUCTURE : L'oxyde de magnésium est un cristal ionique. L'oxyde de magnésium a une structure comparable à celle du chlorure de sodium7. Cela se traduit par Un réseau d'anion oxygène formant une structure de type cubique à faces centrées Un réseau de cation magnésium occupant l'ensemble des sites octaèdriques. L'oxyde de magnésium est un matériau modèle des cristaux ioniques car la faible électronégativité du magnésium, et la forte électronégativité de l’oxygène font que la structure de l’oxyde de magnésium peut s’expliquer quasi uniquement grâce à des interactions entre des particules ponctuelles chargées 10. La surface de l'oxyde de magnésium la plus stable dans le vide est obtenue en réalisant une coupe selon le plan cristallographique (100). Les particules d'oxyde de magnésium produites par combustion du magnésium métallique présentent d'ailleurs une forme cubique révélatrice de la présence de ces plans. Néanmoins, en présence d'eau, la surface de l'oxyde de magnésium est couverte d'ions hydroxyles qui stabilisent les plans (111) PRODUCTION : La majeure partie de l'oxyde de magnésium est actuellement obtenue soit à partir de carbonate de magnésium MgCO3 qui constitue certains minéraux tels que la magnésite, soit à partir de chlorure de magnésium que l'on extrait de l'eau de mer ou de saumures souterraines. Résistance à l'abrasion Revêtements inorganiques Index. décimale : 667.9 Revêtements et enduits Résumé : This paper mainly studies an inorganic coating based on geopolymer technology. Metakaolin is used as raw material, and water glass solution is used as alkali activator to prepare geopolymer. The surface properties including crack resistance and scrub resistance of the obtained coating were improved by adding certain amount of resin and fillers such as silicone acrylic emulsion, mica powder, and MgO powder. The results show that when the contents of silicone acrylic emulsion, mica powder, and MgO powder are 19.00%, 3.20%, and 2.16–2.86%, respectively, the surface properties of the coating are optimal. Especially noteworthy is that adding MgO can enhance the surface properties of the prepared coating, the mechanism of which can be rationalized by the inhibited shrinkage of the coating via microcrack deformation, the enhanced compactness and the filled pores of the coating upon adding MgO. In addition, the flame retardancy of the samples was explored through thermal analysis and cone calorimeter. Note de contenu : - EXPERIMENTAL : Materials - Experimental methods - Experimental proportion - Characterization and testing methods - RESULTS AND DISCUSSION : Coating properties - Structure characterizations - Table 1 : Chemical composition of kaolin and metakaolin - Table 2 : Mixed proportions of samples - Table 3 : The crack resistance of the coatings without adding any filler - Table 4 : The crack resistance of the coatings with fillers - Table 5 : The influence of WG/MK on the water resistance of the coating - Table 6 : The appearance performance of the coating under different curing daysTable 7 Heat release parameters for sample DOI : https://doi.org/10.1007/s11998-021-00572-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00572-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38088 [article]

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Improving fungal decay resistance of solvent and waterborne polyurethane-coated wood by free and microencapsulated thyme essential oil / Seyed Mahmoud Miri Tari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 959-966 Titre : Improving fungal decay resistance of solvent and waterborne polyurethane-coated wood by free and microencapsulated thyme essential oil Type de document : texte imprimé Auteurs : Seyed Mahmoud Miri Tari, Auteur ; Asghar Tarmian, Auteur ; Mohammad Azadfallah, Auteur Année de publication : 2022 Article en page(s) : p. 959-966 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Bois -- Revêtements protecteurs Caractérisation Charme (arbre) Carpinus, le Charme, est un genre d'arbres et d'arbustes de la famille des Bétulacées (anciennement de la famille des Corylacées qui est maintenant intégrée aux Bétulacées). Ce genre compte une trentaine d'espèces des régions tempérées de l'hémisphère nord, d'Asie mineure et d'Europe. Ils fournissent un excellent bois de chauffage, du bois de trituration et différents bois de service. Les charmes sont des arbres pouvant mesurer jusqu'à 25 mètres, à feuilles marcescentes, alternes, petites (de 3 à 10 cm de long), simples, avec le bord du limbe finement denté. L'écorce de l'arbre est foncée et souvent grise. Elle est quelquefois marron. Les fruits sont des akènes ligneux de 3 à 6 mm de long, attachés à une bractée en forme de feuille simple ou trilobée qui forme une aile favorisant leur dispersion. (Wikipedia) Encapsulation Huile essentielle de thym Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Polyuréthanes Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Free and microencapsulated thyme essential oils (Zataria multiflora Boiss) were incorporated into solvent and waterborne polyurethane coatings separately to enhance decay resistance of the biocide free coatings. The essential oil was extracted by hydro-distillation in a Clevenger-type apparatus for 4 h. Poly (methyl methacrylate) (PMMA) microcapsules containing thyme oil as an active ingredient were prepared through solvent evaporation method with oil in water emulsion system. Fungal resistance of the coated hornbeam wood (Carpinus betulus) against white rot fungus Coriolus versicolor CTB 863 A and brown rot fungus Coniophora puteana BAM Ebw. 15 was tested according to European EN 113 standard before and after six-cycle accelerated aging test (ASTM D1037). The results revealed that the core-shell capsules were formed properly, and their sizes were in the range of 5–50 µ. The encapsulation efficiency determined by UV–visible spectrophotometer at λ = 275 nm was 67%. The free essential oil was not efficient enough to improve the fungal resistance, while the microencapsulated oil enhanced the resistance even after the accelerated aging via a controlled-release mechanism as well as protected the susceptible ingredients through the shielding effect of the polymeric shell. Note de contenu : - MATERIALS AND METHODS : Coatings and chemicals - Isolation of essential oil and gas chromatography-mass spectrometry (GC–MS) Synthesis of PMMA microcapsules and their characterization - Measuring encapsulation efficiency - Release kinetics of thyme essential oil - Wood sampling and coating method - Decay and accelerated aging tests - Statistical analysis - RESULTS AND DISCUSSION : Morphology of the microcapsules - Encapsulation efficiency (%) - Release kinetics of thyme oil - Chemical compositions of thyme essential oil - Fungal decay - Table 1 : Chemical compositions of Z. multiflora essential oil - Table 2 : The average mass loss of Carpinus betulus wood specimens coated by biocide-free and biocide-containing solvent-based polyurethane coatings against white rot fungus Coriolus versicolor and brown rot fungus Coniophora puteana before and after an accelerated aging - Table 3 : The average mass loss of Carpinus betulus wood specimens coated by biocide-free and biocide-containing waterborne polyurethane coatings against white rot fungus Coriolus versicolor and brown rot fungus Coniophora puteana before and after an accelerated aging DOI : https://doi.org/10.1007/s11998-021-00573-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00573-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38089 [article]

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Preparation of superhydrophobic titanium surface via the combined modification of hierarchical micro/nanopatterning and fluorination / Zhen Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 967-975 Titre : Preparation of superhydrophobic titanium surface via the combined modification of hierarchical micro/nanopatterning and fluorination Type de document : texte imprimé Auteurs : Zhen Wang, Auteur ; Bing Ren, Auteur Année de publication : 2022 Article en page(s) : p. 967-975 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chimie des surfaces Dispositifs médicaux Fluoroalkylsilane Hydrophobie Implants médicaux Infections nosocomiales Mouillabilité Revêtements -- Emploi en thérapeutique Titane Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Adhesion of bacteria and platelets on blood-contact implants and surgical devices is one of the causes of infections and thrombus. A superhydrophobic surface serving as a protective layer can minimize adhesion and contamination due to the low surface energy. The objective of this paper is to construct a superhydrophobic surface on a titanium implant by a combination of a topological structure and chemical coating. First, a micro/nano hierarchical morphology is obtained by sandblasting, acid-etching, and anodic oxidation. Then, a low surface energy coating material (fluoroalkylsilane, as the example case in this study) is used to modify the surface further. The effects of the morphology of micro and/or nanoscales and corresponding fluorination on the wettability are investigated. The results show that a hierarchical surface with microroughness and nanotubes is successfully constructed, and the contact angle (CA) is 44.9°, indicating good hydrophilicity. Interestingly, after being modified by fluoroalkylsilane, the surface converted from hydrophilic to superhydrophobic with a CA of 151.4°. In contrast, the fluorination modification of single micro or nanofeatures cannot achieve superhydrophobicity, indicating that the micro/nanostructures may show a synergistic effect for an efficient fluorination coating later on. Overall, our results demonstrate the feasibility of achieving a superhydrophobic surface via the micro/nano topological patterning and fluorination modification. The proposed method is expected to enrich the preparation technologies of superhydrophobic titanium surfaces. Note de contenu : - MATERIALS AND METHODS : Anodic oxidation parameter settings - Construction of micro/nano hierarchical structures - Fluoroalkylsilane (FAS) modification - Surface characterization - RESULTS : Effects of electrolyte and voltage during anodic oxidation - Surface morphology - Chemical composition - Surface wettability DOI : https://doi.org/10.1007/s11998-021-00576-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00576-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38090 [article]

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Preparation of PVA/PU/PUA microcapsules and application in self-healing two-component waterborne polyurethane coatings / Xinmeng Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 977-988 Titre : Preparation of PVA/PU/PUA microcapsules and application in self-healing two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Xinmeng Xu, Auteur ; Zhongqun Zhou, Auteur ; Liangrong Qin, Auteur Année de publication : 2022 Article en page(s) : p. 977-988 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Microcapsules Polyacétate de vinyle Polymères -- Synthèse Polyurée Polyuréthanes Revêtement autoréparant Revêtements bi-composant Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : It is difficult to produce coatings that have good mechanical and self-healing properties. In this study, polyvinyl alcohol/polyurethane/polyurea (PVA/PU/PUA) microcapsules (MCs) loaded with isophorone diisocyanate (IPDI) as core materials were first prepared by interfacial polymerization in an oil-in-water emulsion using different PVA as an emulsifier. The MCs were then uniformly dispersed in the matrix. Optical microscopy and scanning electron microscopy revealed that the size of MCs decreased as alcoholysis and polymerization degree of PVA increased. Thermogravimetric analysis showed that the MCs prepared with the high polymerization or alcoholysis degree of PVA revealed outstanding thermal stability, and the initial decomposition temperature increased by approximately 100°C compared with IPDI. Furthermore, the self-healing performance of the two-component waterborne polyurethane (2K WPU) coating system containing MCs was investigated. The 2K WPU coatings with 9 wt% PVA/PU/PUA MCs exhibited excellent self-healing, mechanical properties, and corrosion resistance, and indicated a high potential for smart coating. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Synthesis of PVA solution - Synthesis of MCs - Preparation of self-healing 2K - WPU coatings - Characterization - RESULTS AND DISCUSSION : Analysis and characterization of MCs - Self-healing performance of 2K WPU - Table 1 : Thermal weight loss data of MCs and capsule shells - Table 2 : Film performance of 2K WPU coatings loaded with different types of MCs - Table 3 : Coating performance of 2K WPU with different MCs content DOI : https://doi.org/10.1007/s11998-021-00577-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00577-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38091 [article]

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Thin liquid films on a rotary bell atomizer in surface-following coordinates / Mark Doerre in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 939-945 Titre : Thin liquid films on a rotary bell atomizer in surface-following coordinates Type de document : texte imprimé Auteurs : Mark Doerre, Auteur ; Nelson K. Akafuah, Auteur Année de publication : 2022 Article en page(s) : p. 939-945 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atomisation Automobiles -- Revêtements:Automobiles -- Peinture Cloche rotative Fluides, Mécanique des Revêtements -- Appareils et matériels:Peinture -- Appareils et matériels Index. décimale : 667.9 Revêtements et enduits Résumé : This article analyzes a published formulation of the Navier–Stokes equations cast into surface-following coordinates and provides some additional mathematical background to follow the article. Ubiquitous in the paint shops of automotive plants around the world, a high-speed rotary bell is succinctly described as a rapidly spinning concave axisymmetric surface with liquid paint supplied from a port coinciding with the center of rotation. The spinning surface transfers momentum to the paint film causing it to flow outward. Upon reaching the bell periphery, it is flung off, subsequently forming an atomized spray transferred to an automotive body through advection and electrostatics. Common analytical frameworks of rotating films were spherical or cylindrical coordinate systems where the wetted surface profile of the bell was constrained to follow a coordinate axis. This led to solutions for films modeled with conical, disk-like, or partial hemispherical profiles. An alternative was a more general case using a surface-following orthogonal curvilinear coordinate system along with its derived vector operators. In the unique case of a thin film, these results validated a simpler pattern found in common coordinate systems. Note de contenu : - Example in literature - Surface-following coordinate system - Table 1 : Summary of prior works in common coordinate systems DOI : https://doi.org/10.1007/s11998-021-00571-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00571-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38092 [article]

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