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Ajouter le résultat dans votre panierRecent progress of zeolitic imidazolate frameworks (ZIFs) in superhydrophobic and anticorrosive coatings for metals and their alloys / Dan Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
Titre : Recent progress of zeolitic imidazolate frameworks (ZIFs) in superhydrophobic and anticorrosive coatings for metals and their alloys Type de document : texte imprimé Auteurs : Dan Zhang, Auteur ; Linming Xiao, Auteur ; Gaodian Xiong, Auteur ; Zengxi Pan, Auteur ; Guohong Ma, Auteur Année de publication : 2023 Article en page(s) : p. 1157-1177 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Hydrophobie
Imidazolates de zéolite
Métaux -- Revêtements protecteurs
Mouillabilité
Polymères
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Metal-organic frameworks (MOFs) have gained interest in recent years for anticorrosion applications owing to their inimitable structures and excellent properties. As a prominent subclass of MOFs, zeolite imidazolate frameworks (ZIFs) exhibited hydrophobicity, corrosion inhibition, and positive water stability, making them frequently appear in the field of metallic anticorrosion. This review presents the establishment and development of a theoretical model for superhydrophobicity, followed by the reported applications of different kinds of ZIFs in the field of metallic anticorrosion with particular emphasis on ZIF-8, which is the most extensively researched structure among ZIFs. In addition, the applications of superhydrophobic coatings in many aspects other than anticorrosion are also summarized. Finally, the existing challenging problems and future development trends of this kind of coating are discussed. It is hoped that this review will contribute to further development in the field of superhydrophobic anticorrosion coatings for metallic materials. Note de contenu : - WETTABILITY THEORY :
- Young’s equation
- Wenzel’s equation
- Cassie–Baxter’s Model
- APPLICATION OF ZIF-8 COMPOSITES :
- Improvement of superhydrophobic and anticorrosion properties for metallic materials
- Other application of ZIF-8 composites
- APPLICATION OF OTHER ZIFS (EXCEPT ZIF-8) COMPOSITES IN SUPERHYDROPHOBIC/ANTICORROSION OF METALLIC MATERIALS
- Table 1 : Detailed data of ZIF-8 modified with low surface energy in superhydrophobic corrosion protection of metallic materials
- Table 2 : Detailed data of ZIFs application in superhydrophobic/anticorrosionDOI : https://doi.org/10.1007/s11998-023-00769-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00769-4.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39708
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Titre : Prediction of paint chalking rates from early exposure data Type de document : texte imprimé Auteurs : Michael P. Diebold, Auteur Année de publication : 2023 Article en page(s) : p. 1179-1191 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane
Durée de vie (Ingénierie)
Essais accélérés (technologie)
Farinage (défauts)
Modèles mathématiques
Revêtements -- Défauts:Peinture -- Défauts
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets du rayonnement ultraviolet:Peinture -- Effets du rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Color fade (chalking) data for roughly 1200 paints made with different grades of TiO2 pigment that were exposed in Florida were compiled and analyzed a number of ways. Chalk/fade (C/F) values were calculated for each sample after 6, 7, 8, 9, 12, 15 and 18 months and compared to their final (21 month) C/F values. There is generally excellent agreement between 6- and 9-month C/F results and final C/F values, and this technique can be used with a high level of confidence to rapidly predict C/F durability values. In some instances, early C/F values are better measures of TiO2 pigment photocatalytic activity than the later C/F values. In addition, we examined the effect of starting month on degradation rate and found that after one year, series started in early summer degraded to a greater extent than those started in late autumn, despite the fact that all samples were exposed to the same nominal amount of ultraviolet light. Finally, location of a panel within each exposure series had a small but statistically significant effect on C/F values. Note de contenu : - Objective and method
- Data collection
- Data analysis
- Mathematical modeling : General - Proof of concept - Sources of error
- Other results of interest
- Effect of position in series on chalking
- Effect of starting month on chalking
- Table 1 : Percent of samples with three or more red reflectance values greater than 100 after a set number of months exposed
- Table 2 : Percent of samples having early C/F values within a given range about the final C/F value
- Table 3 : Average difference (measured in C/F units) between early and final C/F values, as a function of exposure time
- Table 4 : Differences between early and final C/F value, classified according to the number of data points used to calculate X22
- Table 5 : Comparison of actual and calculated times to 220 red reflectance for samples with 9-month errors in excess of + 10 C/F unitsDOI : https://doi.org/10.1007/s11998-023-00727-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00727-6.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39709
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Titre : Thermal properties of intumescent coating with waterborne melamine-acrylic emulsion resin for plywood Type de document : texte imprimé Auteurs : Chih-Shen Chuang, Auteur ; Po-Heng Lin, Auteur Année de publication : 2023 Article en page(s) : p. 1193-1205 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère mélamine-formaldéhyde
Intumescence (chimie)
Polyacryliques
Résonance magnétique nucléaire
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements organiques
ThermocinétiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : A mixture of etherified melamine–formaldehyde and acrylic emulsion resin was designed, with the hybrid resin improving the fire retardancy of indoor plywood as well as the CO and CO2 emissions. The water-based hybrid resin exhibited a single curing peak; the need for solvents was reduced. Compared with pure etherified melamine–formaldehyde resin, the hybrid resin had better flame retardancy and produced less pollution. Scanning electron microscopy and cone calorimetry were conducted, and the analyses revealed that lower binder resin concentrations resulted in improved flame retardancy and better char layer formation. When the binder resin concentrations were increased and CO/CO2 emissions were continued beyond 300 s, the flame retardancy of the intumescent coating was the same as that of the lower binding resin concentrations. Furthermore, the chemical structure and durability of the phosphocarbonaceous structure were verified through Fourier transform infrared spectroscopy and solid-state nuclear magnetic resonance analyses. Note de contenu : - EXPERIMENT :
- Materials
- Preparation of water-based melamine acrylic resin and intumescent coating
- Thermal property analysis of resin and coating film
- Cone calorimeter test
- Analysis of chemical properties of coating film (Fourier-transform infrared spectroscopy and 31 P solid-state nuclear magnetic resonance test)
- RESULTS AND DISCUSSION :
- Thermal properties of melamine/acrylic hybrid resin
- Analysis of FR of intumescent coatings
- TGA of intumescent coatings
- CO and CO 2 emissions
- Fourier transform infrared analysis
- P solid state NMR analysis
- Table 1 : Basic information of the material
- Table 2 : Different formulations of intumescent fire-retardant paint in solid weight ratio (w/w)
- Table 3 : The different compositions coatings of cone calorimeter experimentsDOI : https://doi.org/10.1007/s11998-023-00736-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00736-5.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39710
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Titre : The effect of reactive diluents on curing of epoxy resins and properties of the cured epoxy coatings Type de document : texte imprimé Auteurs : Liepa Pastarnokien, Auteur ; Jurate Jonikaite-Svegzdiene, Auteur ; Neringa Lapinskaite, Auteur ; Ruta Kulbokaite, Auteur ; Alma Bockuviene, Auteur ; Tatjana Kochane, Auteur ; Ricardas Makuska, Auteur Année de publication : 2023 Article en page(s) : p.1207-1221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Analyse thermique
Diluants
Epoxydes
Gélification
Réticulants
Réticulation (polymérisation)
Revêtements organiques
Rhéométrie
Temps de prise en gelIndex. décimale : 667.9 Revêtements et enduits Résumé : The effect of monofunctional, difunctional, and trifunctional reactive epoxy diluents (RDs) on curing of epoxy resins by amine hardeners was studied by DSC and oscillatory rheometry. It was determined that curing of the epoxy resins containing difunctional RD was characterized by the lowest activation energy Ea, and the cure reaction was of first order. The shortest gelation time under curing was characteristic for the epoxy resins containing difunctional RDs, while vitrification time of the cured epoxy resins containing difunctional or trifunctional RDs was similar. The use of difunctional RDs as a part of epoxy resins was the most advantageous since they facilitated curing process enabling to reach high degree of curing faster. The effect of RDs of various functionalities on glass transition temperature Tg of the cured epoxy resins and mechanical properties of the epoxy coatings was noticeable but small. Functionality of RDs had no noticeable effect on adhesion and flexibility of the epoxy coatings. Coatings of the cured epoxy resins containing difunctional RD were characterized by slightly higher hardness and increased abrasion resistance. Difunctional reactive epoxy diluents show great potential to be used in epoxy formulations by facilitating curing process and improving mechanical properties of the cured epoxy coatings. Note de contenu : - EXPERIMENTAL :
- Materials
- Methods
- RESULTS AND DISCUSSION :
- The effect of reactive diluents on the curing of the epoxy/amine systems
- The effect of reactive diluents on properties of the cured epoxy coatings
- Full size table
- Table 1 Composition of epoxy resins (PA)
- Table 2 Composition of amine hardeners (PB)
- Table 3 Metal substrates used for mechanical tests
- Table 4 Characteristic parameters of DSC curing of epoxy resins by different amines
- Table 5 Kinetic parameters for the DSC curing of epoxy/amine systems
- Table 6 Gelation and vitrification time of the curing epoxy resins determined by oscillatory rheometry
- Table 7 Properties of the cured epoxy coatings containing reactive diluents of various functionalities
- Table 8 Properties of the cured epoxy coatings containing various reactive diluents, fillers, and additivesDOI : https://doi.org/10.1007/s11998-023-00737-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00737-4.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39711
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Titre : Polypyrrole-modified multi-functional coatings for improved electro-conductive, hydrophilic and flame-retardant properties of polyamide 66 textiles Type de document : texte imprimé Auteurs : Chanchal Kumar Kundu, Auteur ; Zhiwei Li, Auteur ; M. Azizur R. Khan, Auteur ; Oisik Das, Auteur Année de publication : 2023 Article en page(s) : p. 1223-1234 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Conduction électrique
Essais de comportement au feu
Essais dynamiques
Formulation (Génie chimique)
Hydrophilie
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Matériaux -- Propriétés fonctionnelles
Morphologie (matériaux)
Polyamide 66
Polypyrroles
Surfaces -- Analyse
Textiles et tissus à usages techniques -- Propriétés mécaniques
Thermogravimétrie
Traction (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : Multi-functional textiles have received much attention in the technical textile field for their novel functionalities available in a single substrate. Polyamide 66 (PA66), being an engineering polymer with excellent physio-mechanical properties, exhibits immense possibilities to be developed as a multifunctional textile substrate. In this work, multi-functional polyamide 66 (PA66) textiles equipped with enhanced electro-conductive, hydrophilic and flame-retardant properties were developed via in situ polymerization of pyrrole monomer onto the PA66 fabric surfaces. Meanwhile, various formulations comprised of phytic acid (PA), chitosan (CS), graphene oxide (GO) and Na-metaborate (B) along with the pyrrole also experimented with a goal to study the contribution of each compound onto the desired properties and finally, to come up with a suitable formulation. Among these formulations, only pyrrole containing formulation (i.e., PA66-PPy) demonstrated a significant improvement in all three desired functionalities, namely a noteworthy escalation in electrical conductivity (i.e., about a 43 times increase compared to the pure PA66), a semi-hydrophilic surface (i.e., water contact angle value was lowered from 124.3– 49.9°) and a substantial reduction in the peak heat release rate by 45%. Meanwhile, the formulation comprising both the pyrrole and phytic acid made the polyamide surface a super-hydrophilic one, whereas other formulations exhibited potential efficacy in attaining better flame retardancy, especially in terms of limiting oxygen index (LOI) values, vertical flame test data and char yield%. Note de contenu : - EXPERIMENTAL :
- Materials
- Fabric preparation
- Characterization techniques
- RESULTS AND DISCUSSION :
- Surface morphology
- Electrical conductivity
- Hydrophilicity
- Thermal analysis
- Fire properties
- Mechanical properties
- Table 1 : Formulations and dry weight pickup of PA66 fabric samples
- Table 2 : Electrical conductivity data of PA66 fabric samples
- Table 3 : Thermogravimetric analysis data of PA66 fabric samples
- Table 4 : LOI and vertical flame test data of PA66 fabric samples
- Table 5 : Cone calorimetry data of PA66 fabric samples
- Table 6 : Tensile properties of PA66 fabric samplesDOI : https://doi.org/10.1007/s11998-023-00738-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00738-3.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39712
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Titre : Influence of impingement flows with sand particles on the barrier properties of organic coatings Type de document : texte imprimé Auteurs : Amin Vedadi, Auteur ; Jordi Estevadeordal, Auteur ; Xinnan Wang, Auteur ; Jiajia Rao, Auteur ; Yechun Wang, Auteur Année de publication : 2023 Article en page(s) : p. 1235-1255 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contraintes (mécanique)
Dynamique des fluides computationnelle
Eoliennes
Essais de résilience
Essais dynamiques
Flux d'impact
Particules (matières)
Revêtements organiques
Sable
Spectroscopie d'impédance électrochimique
Structures offshoreIndex. décimale : 667.9 Revêtements et enduits Résumé : The installations of offshore wind farms, especially the type with monopile structures, increase the number of suspended particles in the surrounding area. The offshore wind structures are usually coated with several layers of coatings, including a thin layer of organic coating as a topcoat. In this study, we aim to investigate the influence of the stresses on the organic coatings due to the kinetic energy of the suspended sand particles. To accomplish the goal, impingement flow jets with particles were applied on coated steel samples for a week in a lab-scale impingement chamber. The working fluid for the experiments was 3.5 wt% NaCl solution with 1 wt% suspended sand particles. Electrochemical impedance spectroscopy (EIS) was conducted to monitor the degradation of organic coatings while exposed to the impingement flow. Computational fluid dynamics (CFD) modeling was utilized to calculate the magnitude of the applied fluid stresses on the coatings. Thermodynamics of electrochemical reactions and the activation theories were utilized to compare with the electrochemical parameters. It was concluded that for the lowest flow rate (Q1 = 6.31 cm3/s), the added sand particles started to show destructive influence after the first three days of exposure. As the flow rate increased, the destructive influence of sand particles on coating samples appeared earlier at the beginning of the exposure, and the elements of equivalent circuit model showed larger difference between coatings exposed to pure NaCl solution and those exposed to solution with sand particles. For the highest flow rate (Q3 = 18.93 cm3/s), the destructive influence of sand particles was significant, indicating that for the particulate flows with the velocity of 1 m/s, which is the regular velocity of the underwater zone in shallow sea regions (with a depth of 30 m), the momentum impact of the sand particles plays a vital role in the degradation of the organic coatings. Note de contenu : - EXPERIMENTS :
- Samples and fluid preparation
- Electrochemical spectroscopy measurement and topography characterization
- Experimental set-up
- CFD modeling of the impingement flow in the chamber
- RESULTS AND DISCUSSION :
- Analysis of the applied fluid’s stresses and particle impacts based on CFD results
- EIS results of the particulate and non-particulate impingement flows and their respective equivalent circuit model
- Equivalent circuit modeling, and comparison between the circuit elements of the particulate and non-particulate flow
- Electrochemical parameters of the particulate and non-particulate flows
- Table 1 : The thickness and average coating capacitance before and after exposure to sand particulate and non-particulate 3.5 wt% NaCl solution at different flow rate, as well as the water uptake and volume fraction of water in the coatings after a week of exposureDOI : https://doi.org/10.1007/s11998-023-00739-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00739-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39713
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Titre : Novel bio-based phosphorous-containing UV-curable flame-retardant coatings Type de document : texte imprimé Auteurs : Elif Ozman, Auteur ; Cemil Dizman, Auteur ; Hatice Birtane, Auteur ; Memet Vezir Kahraman, Auteur Année de publication : 2023 Article en page(s) : p. 1257-1268 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux
Chimie -- Essais et réactifs
Composés organiques -- Synthèse
Formulation (Génie chimique)
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Méthacrylate de glycidyle
Revêtements -- Propriétés thermiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, a novel bio-based phosphorus-containing reagent was synthesized and characterized. To obtain a flame retardant agent with acid functionality, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and bio-based itaconic acid were first reacted. The synthesized acid then was reacted with glycidyl methacrylate to form a difunctional phosphorus-containing methacrylate flame retardant monomer. The flame retardant monomer was added to a reactive monomer matrix with a photoinitiator to prepare UV-curable coatings. The molecular structure of the flame retardant was confirmed by Fourier-transform infrared-attenuated total reflection spectroscopy and proton nuclear magnetic resonance (1H NMR) spectroscopy. The flame retardant behavior of coatings was determined using limiting oxygen index. Thermal behaviors of the films were studied by thermal gravimetric analysis. Furthermore, scanning electron microscopy/energy-dispersive spectroscopy was used to determine the elemental composition and to observe the morphology of the coatings. The properties (water adsorption, gel content, etc.) of the coatings were also studied. It was found that the addition of DOPO resulted in a significant improvement in the flame retardant and thermal properties of the coatings. Note de contenu : - MATERIALS :
- Synthesis
- Synthesis of DOPO-ITA
- Synthesis of DOPO dimethacrylate (DOPO-DMA)
- PREPARATION OF VU CURABLE COMPOSITIONS
- Table 1 : Formulations of UV curable coatings
- Table 2 : Thermal properties of UV curing formulations
- Table 3 : The gel contents of UV-curable films
- Table 4 : The mechanical properties of DOPO-DMA filmsDOI : https://doi.org/10.1007/s11998-023-00740-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00740-9.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39714
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Titre : Preparation of 3-alkoxy-2-hydroxypropyl ester of 2-ethylhexanoic acid and its application in polymer latexes and coatings Type de document : texte imprimé Auteurs : Zou Xinru, Auteur ; Yi-en Yuan, Auteur ; Yong-xin Ji, Auteur Année de publication : 2023 Article en page(s) : p. 1269-1283 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Auxiliaire de coalescence
Caractérisation
Coalescence (Sciences physiques)
Composés organiques -- Synthèse
Esterification
Latex
Revêtement mural
Revêtements -- Additifs
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : In recent years, most of the coalescing aids commonly used in the market contain volatile organic compounds (VOCs) with low boiling point. Herein, we designed and prepared a novel environmentally friendly coalescing aid, 2-ethylhexanoic acid-3-alkoxy-2-hydroxypropyl ester. Under the action of a catalyst, 2-ethylhexanoic acid and alkyl glycidyl ether were used as raw materials for ring-opening esterification reaction, and 2-ethylhexanoic acid-3-alkoxy-2-hydroxypropyl ester was finally generated. We conducted a single-factor experiment and orthogonal experiment L9(34) to explore the optimal reaction conditions. The structure of the product was characterized by 1HNMR and FTIR. The boiling point of the product was determined to be 270–283°C, which was in line with the requirements of the national environmental protection regulations for VOCs. Compared with traditional coalescing aids, the product has low volatility, is not classified as a VOC and is safe and environmentally friendly. The properties of the product were characterized, and the applications of the product in polymer latex and coating were determined. We measured the minimum film-forming temperature (MFFT), atomic force microscopy (AFM), water absorption, scrub resistance, adhesion, color difference, and other properties of the film. The results show that the performance of the new coalescing aid is superior to Texanol (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), which is commonly used in the market, and it has obvious advantages. Note de contenu : - EXPERIMENTAL SECTION :
- Materials
- Instruments
- Synthetic route to IE-3 and IE-4
- Synthesis of IE-3 and IE-4
- Gas chromatography analysis
- Characterization of product
- Evaluation of the effect of IE-3 and IE-4 in polymer latex
- Evaluation of the effect of IE-3 and IE-4 in coatings
- RESULTS AND DISCUSSION :
- Selection of reaction conditions
- Characterizations of product
- Evaluation of the effect of IE-3 and IE-4 in polymer latex
- Evaluation of the effect of IE-3 and IE-4 in coatings
- Table 1 : Composition of polymer latex
- Table 2 : Composition of exterior wall coating
- Table 3 : Composition of interior wall coating
- Table 4 : Orthogonal experimental factors and level table
- Table 5 : Orthogonal experimental program and results
- Table 6 : Boiling point range of two coalescing aids
- Table 7 : VOC content of interior wall coating and exterior wall coating that was added with coalescing aid
- Table 8 : Color difference of interior wall coating added with different coalescing aids
- Table 9 : Color difference of exterior wall coating added with different coalescing aidsDOI : https://doi.org/10.1007/s11998-023-00741-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00741-8.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39715
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Titre : Surface application of different concentrations of chitosan on recycled paper and its impact on packaging properties Type de document : texte imprimé Auteurs : Shubhang Bhardwaj, Auteur ; Prabhjot Kaur, Auteur ; Nishi Kant Bhardwaj, Auteur ; Yuvraj Singh Negi, Auteur Année de publication : 2023 Article en page(s) : p. 1285-1298 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Caractérisation
ChitosaneLe 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.
Emballages
Energie -- Absorption
Fourier, Spectroscopie infrarouge à transformée de
Matériaux -- Propriétés barrières
Papier
Papier -- Propriétés mécaniques
Produits et matériaux recyclés
Réflexion totale atténuée
Revêtements organiques
Traction (mécanique)
Traîtements de surface
Transmission de vapeur d'humiditéIndex. décimale : 667.9 Revêtements et enduits Résumé : The present study explored chitosan, a biodegradable nontoxic biopolymer, at different dosages for surface treatment of recycled paper to improve various properties relevant to packaging. Chitosan, at all applied concentrations, improved important paper properties like surface, strength and barrier due to which the low strength paper can also be used as a packaging paper. The effects of surface treatment of chitosan solutions of different concentrations on paper were analyzed by measuring breaking length, burst index, tear index, double fold, stiffness, air permeance, water vapor transmission rate (WVTR), wax pick, tensile energy absorption (TEA), and stretch. After surface treatment by 1% solution of chitosan, the breaking length, double fold, TEA, and stretch in machine direction were increased by 53.8%, 243%, 93%, and 75%, respectively, whereas burst index was increased by 38.4% in comparison with the base paper. The WVTR was reduced from 706 to 496 g/m2/24 h, and air passage time was increased from 18 to 65 Gurley s after surface treatment by 1% chitosan solution on the base paper. The chitosan solution at all the concentrations showed antibacterial activity in plate assay therefore reducing the susceptibility of paper to microbial attack. Note de contenu :
- MATERIALS AND METHODS :
- Materials
- Analytical techniques
- RESULTS AND DISCUSSION :
- Characterization of Chi
- Antibacterial activity of Chi at different concentrations
- FTIR–ATR analysis of paper with and without surface treatment
- Scanning electron microscopy of base paper and surface treated papers
- Effect of surface treatment by Chi solutions of different concentrations
- Table 1 : Application of chitosan either alone or in combination with other polymers on paper
- Table 2 : Characterization of Chi
- Table 3 : Effect of surface treatment by different Chi solutions on various strength properties
- Table 4 : Effect of surface treatment by different Chi solutions on various surface propertiesDOI : https://doi.org/10.1007/s11998-023-00743-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00743-6.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39716
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Titre : Characteristics of urushi film prepared through thermal polymerization Type de document : texte imprimé Auteurs : Chieko Narita, Auteur ; Yoko Okahisa, Auteur ; Saori Kitaguchi, Auteur ; Kazushi Yamada, Auteur Année de publication : 2023 Article en page(s) : p. 1299-1310 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Analyse thermique
Angle de contact
Biopolymères
Colorimétrie
Laque et laquage
Laque japonaise
Mesure
Microscopie électronique à balayage
Polymérisation thermique
Revêtements -- Propriétés mécaniques
RugositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Urushi (oriental lacquer) is a natural material that forms thin films with excellent durability and water resistance. There are two methods for curing urushi: oxidative and thermal polymerizations. Urushi is mainly applied to wood; therefore, the oxidative polymerization method has mainly been used to cure it. Oxidative polymerization requires temperature and humidity control and takes a long time to fully cure urushi. Urushi mixed with pigments has poor coloration. In contrast, the use of a thermal polymerization reaction can achieve curing in a short time. In this study, we focused on the thermal curing reaction of urushi, formed 13 different colored urushi coating films, and investigated their properties and coloration. We observed that urushi coatings produced through thermal polymerization took less time to cure than those produced through oxidative polymerization, and that urushi coatings with better coloration and high water repellency were obtained. Note de contenu : - EXPERIMENTAL :
- Materials and preparation of samples
- Measurement methods
- RESULTS AND DISCUSSION :
- FTIR spectroscopy
- DSC
- Color measurements
- UV–visible spectroscopy
- SEM observation
- Surface roughness and contact angle
- Mechanical properties
- Table 1 Correspondence table between pigments and sample name
- Table 2 L*, a*, b*, and C* values of all samples measured using SCI and SCE modes
- Table 3 Surface roughness of the samples G, K, and M obtained via laser microscopyDOI : https://doi.org/10.1007/s11998-022-00745-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00745-4.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39717
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Titre : Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures Type de document : texte imprimé Auteurs : Travis B. Smith, Auteur ; David Chisholm, Auteur ; Abby Cheng, Auteur ; Juan Ortiz Salazar, Auteur ; Lia Roccucci, Auteur ; Bailey Morales, Auteur ; Gary Dombrowski, Auteur ; John J. Rabasco, Auteur ; Patrick Hartnett, Auteur ; Ray Fernando, Auteur Année de publication : 2023 Article en page(s) : p. 1311-1324 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique)
Epaississants
Epaississement
Floculation
Latex
Polyuréthane éthoxylé modifié de façon hydrophobe
Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
SynérèseEn chimie, la synérèse définit la séparation d'un liquide de son gel.Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, hydrophobically modified, ethoxylate urethanes (HEURs) and latexes of well-defined structure and composition were used to examine the rheology and phase behavior of HEUR–latex mixtures. The mixtures comprised one of four HEURs that were synthesized with varying molecular weight polyethylene glycols (PEG 35 K, 20 K, 12 K, and 8 K) and end-capped with octadecyl hydrophobes, as well as one of two latexes (butyl acrylate/styrene [BA-Sty] and butyl acrylate/methyl methacrylate [BA-MMA]) that each contained a small amount of methacrylic acid. The two experimental latexes represent compositions commonly used in commercial paint formulations. The polarity of the HEURs decreases as the PEG molecular weight decreases and the surface of the styrene containing latex is less polar than that containing methyl methacrylate. In all HEUR–latex mixtures, the latex polymer volume fraction was maintained constant at 0.25 which provides a dispersed component spatial crowdedness that represents a fully formulated paint. All latex–HEUR mixtures were stable at very low (i.e., below 0.10% by weight) HEUR levels. At critical concentrations dependent on the polarity of thickener and latex, flocculation was accompanied by syneresis for latex-thickener mixtures prepared with all HEURs except the one with the longest PEG spacer. Further increase of HEUR levels revealed another critical concentration above which the mixtures were stable. Effects of the latex polarity diminished for the mixtures prepared with more hydrophobic HEURs. Note de contenu : - HEUR C18-EO795 and latex mixtures
- HEUR C18-EO455 and latex mixtures
- Table 1 : Compositions and molecular weights (determined by GPC) of model HEURs
- Table 2 : Properties of model latexes
- Table 3 : Compositions of representative latex–HEUR mixtures
- Table 4 : Visual assessment of stability of latex–HEUR samples after 6–8 days of equilibration
- Table 5 : Number of HEUR molecules available per BA-Sty latex particle
- Table 6 : Latex surface area (nm2) claimed by a HEUR hydrophobe, assuming one of the hydrophobes from every HEUR molecule is adsorbeDOI : https://doi.org/10.1007/s11998-022-00746-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00746-3.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39718
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Titre : Synthesis of phosphorous-containing bio-based curing agent for flame retardant epoxy resin system Type de document : texte imprimé Auteurs : V. E. Naiker, Auteur ; Ganesh A. Phalak, Auteur ; D. A. Patil, Auteur ; Aarti Purushottam More, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2023 Article en page(s) : p. 1325-1341 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux
Caractérisation
Combustion
Dichlorure de phénylphosphoneux
Epoxydes
Essais de comportement au feu
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Réticulants -- Synthèse
VanillineIndex. décimale : 667.9 Revêtements et enduits Résumé : A phosphorous containing primary amine-based curing agent, 4-(((3-aminopropyl) imino) methyl)-2-methoxyphenyl(4-(((3-aminopropyl) imino) methyl)-2-methoxyphenyl) phenylphosphonate (VDTS2), was successfully synthesized. The chemical structure of the intermediate and the curing agent was characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance spectroscopy. An epoxy resin was then cured with the phosphorous-based curing agent used in different ratios and with a petroleum-based curing agent. The flame-retardant (FR) properties and thermal decomposition of the respective films were investigated by the limiting oxygen index (LOI), UL-94 burning test, differential scanning calorimetry, thermogravimetric analysis (TGA) and FTIR spectroscopy. Scanning electron microscopy (SEM) analysis was also conducted to study the characteristics of the char obtained. The results of the FR tests showed that the epoxy films cured with the novel amine VDTS2 were able to achieve flame retardancy with an LOI value of 35% and a UL-94 rating of V-0. The TGA analysis showed that the residue of the flame retardant epoxy systems was almost double that of the epoxy resin cured with the petroleum-based amine. The respective films’ mechanical properties were also investigated, and it was observed that the phosphorous-containing amine-based curing agent showed potential to replace the petroleum-based amine for crosslinking epoxy resins. Note de contenu : - EXPERIMENTAL DETAILS :
- Materials
- Synthesis of VDTS1 (bis(4-formyl-2-methoxyphenyl) phenylphosphonate)
- Synthesis of VDTS2 (4-(((3-aminopropyl)imino)methyl)-2-methoxyphenyl (4-(((3-aminopropyl)imino)methyl)-2-methoxyphenyl) phenylphosphonate)
- Film and panel preparation
- CHARACTERIZATION :
- Chemical analysis
- Fourier transform infrared (FTIR) spectroscopy
- Nuclear magnetic resonance (NMR) spectroscopy
- Thermogravimetric analysis (TGA)
- Differential scanning calorimetry (DSC) analysis
- Scanning electron microscopy (SEM)
- Limiting oxygen index (LOI) and UL-94 vertical burning test
- Mechanical properties
- RESULTS AND DISCUSSION :
- Chemical analysis
- Fourier transform infrared (FTIR) spectroscopy
- Nuclear magnetic resonance (NMR) spectroscopy
- Thermogravimetric analysis (TGA)
- Differential scanning calorimetry (DSC) analysis
- Limiting oxygen index (LOI) and UL-94 vertical burning test
- Scanning electron microscopy (SEM)
- FTIR of char residue
- Mechanical properties
- Table 1 Epoxy and amine weight ratios
- Table 2 UL-94 ratings
- Table 3 Theoretical and experimental amine values of VDTS2
- Table 4 Thermal property of cured epoxy films
- Table 5 UL-94 and LOI test results
- Table 6 Mechanical property of filmsDOI : https://doi.org/10.1007/s11998-022-00747-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00747-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39719
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Titre : Robust superhydrophilic antifogging coatings by a facile sol-gel method Type de document : texte imprimé Auteurs : Chong Ke, Auteur ; Chenhua Zhang, Auteur ; Zhang Huijun, Auteur ; Yongdong Jiang, Auteur Année de publication : 2023 Article en page(s) : p. 1343-1352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dioxyde de silicium
Hydrophilie
Nanoparticules
Revêtements anti-buée
Sol-gel, Procédé
Tétraéthoxysilane
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a simple one-step sol–gel process was applied to synthesize SiO2-based superhydrophilic antifogging coatings on glass substrates. In this process, Si(OH)4 sol was first prepared and then SiO2 nanoparticles were added to the sol to form coating solutions. The influence of both the Si(OH)4 sol and SiO2 nanoparticle contents on the coating properties was investigated. Their contents have significant effects on the coatings’ properties, including hydrophilicity and surface morphology. The water contact angle of the optimum coating is about 3.4°. Besides, as revealed by the steam test and freeze test, the optimum superhydrophilic coating demonstrates good antifogging properties and an adequate level of mechanical strength as well. Compared to other techniques used to fabricate antifogging coating on glass substrate, the sol–gel-based process developed in this study requires no expensive equipment, and the processing time is largely shortened. Thus, such technique has great potential applications in the field of coating industry. Note de contenu : - Materials
- Preparation of the superhydrophilic coatings
- CharacterizationDOI : https://doi.org/10.1007/s11998-022-00748-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00748-1.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39720
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Titre : Phosphaphenanthrene-modified zirconium phosphate nanosheets for improving fire resistance, smoke suppression and water tolerance of intumescent coatings Type de document : texte imprimé Auteurs : Cheng Wang, Auteur ; Siqi Huo, Auteur ; Guofeng Ye, Auteur ; Zhengping Fang, Auteur ; Hao Wang, Auteur ; Zhitian Liu, Auteur Année de publication : 2023 Article en page(s) : p. 1353-1367 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-fumée
Caractérisation
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Nanoparticules
Phosphate de zirconium
Polyacryliques
Résistance à la flamme
Revêtements en phase aqueuse -- Additifs
Revêtements organiques
Revêtements protecteurs
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Developing intumescent fire-retardant coatings (IFRCs) combining superior smoke suppression and water resistance is crucial for their industrial applications. Herein, novel 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-decorated zirconium phosphate (ZrP-D) nanosheets are synthesized and employed in the IFRCs. The ZrP-D nanosheets feature multifunctionality, which simultaneously improve the fire resistance, smoke suppression, thermal stability and water tolerance of IFRCs. Notably, introducing 3wt% ZrP-D decreases the backside temperature of IFRC from 293.9 to 166.3°C by ~ 43.4% in fire resistance test, followed by 47.9%, 33.5% and 89.4% reductions in peak heat release rate, total heat release and total smoke release. Moreover, this IFRC exhibits improved thermal stability and water tolerance, of which char yield and water contact angle reach up to 64% and 82.7°, respectively. When exposed to high-temperature flame, the ZrP-D nanoplatelets mainly function in condensed phase, which significantly increases the expansion and compactness of residual char due to the barrier and catalytic charring effects, thus suppressing the heat release and smoke diffusion. This work provides a rational design for creating intumescent fire-retardant coatings combining smoke suppression and water resistance, thus possessing broad prospects in industry. Note de contenu : - EXPERIMENTAL :
- Materials
- Fabrication of α-zirconium phosphate (α-ZrP)
- Preparation of DOPO-decorated ZrP (ZrP-D) nanosheets
- Preparation of intumescent flame-retardant coatings
- Measurements
- RESULTS AND DISCUSSION :
- Characterization of ZrP-D
- Fire resistance and smoke suppression
- Thermal stability
- Fire-retardant mechanism
- Water tolerance
- Table 1 : The compositions of intumescent fire-retardant coatings
- Table 2 : Contents of C, O, N, P, Si, and Zr in ZrP-D
- Table 3 : Detailed results obtained from fire resistance and cone calorimeter tests
- Table 4 : Thermogravimetric properties of the intumescent fire-retardant coatingsDOI : https://doi.org/10.1007/s11998-022-00749-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00749-0.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39721
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Titre : Robotic painting : mimicking human applicators Type de document : texte imprimé Auteurs : Karan Bansal, Auteur ; Yayun Du, Auteur ; Eric Palan, Auteur ; Mohiuddin Quadir, Auteur ; Mohammad Khalid Jawed, Auteur Année de publication : 2023 Article en page(s) : p. 1369-1361 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couleur
Dureté (matériaux)
Epaisseur -- Mesure
Formulation (Génie chimique)
Peinture au rouleau
Résistance au chocs
Robotique collaborativeIndex. décimale : 667.9 Revêtements et enduits Résumé : Robotically assisted painting is widely used for spray and dip applications. However, use of robots for coating substrates using a roller applicator has not been systematically investigated. We showed for the first time, a generic robot arm-supported approach to painting engineering substrates using a roller with a constant force at an accurate joint step, while retaining compliance and thus safety. We optimized the robot design such that it is able to coat the substrate using a roller with a performance equivalent to that of a human applicator. To achieve this, we optimized the force, frequency of adjustment, and position control parameters of robotic design. A framework for autonomous coating is available at https://github.com/duyayun/Vision-and-force-control-automonous-painting-with-rollers; users are only required to provide the boundary coordinates of surfaces to be coated. We found that robotically- and human-painted panels showed similar trends in dry film thickness, coating hardness, flexibility, impact resistance, and microscopic properties. Color profile analysis of the coated panels showed non-significant difference in color scheme and is acceptable for architectural paints. Overall, this work shows the potential of robot-assisted coating strategy using roller applicator. This could be a viable option for hazardous area coating, high-altitude architectural paints, germs sanitization, and accelerated household applications. Note de contenu : - THEORETICAL BACKGROUND :
- Automatic path planning
- Passive force control using position feedback on the end-effector
Materials
- Coatings preparation and testing of coating properties
- Color scheme
- Organoleptic evaluation of coated panels was evaluated
- RESULTS AND DISCUSSIONS :
- Dry film thickness
- Pendulum hardness
- Impact resistance
- Conical mandrel bent test
- Color difference due to difference in painting method
- Table 1 : Summary of methods and formulations
- Table 2 : Color coordinates of the hand and robo-painted coatingsDOI : https://doi.org/10.1007/s11998-022-00750-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00750-7.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39722
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Titre : Preparation and characterization of organic-inorganic hybrid coatings for improving the insulation properties of electrical steel Type de document : texte imprimé Auteurs : Bong-Gu Kim, Auteur ; Hyun-Hee Choi, Auteur ; Hye-Yeong Park, Auteur ; Min Serk Kwon, Auteur ; Yun-Ki Byeun, Auteur ; Sung Kang, Auteur ; Yeon-Gil Jung, Auteur ; Jung-Hun Son, Auteur ; SeungCheol Yang, Auteur Année de publication : 2023 Article en page(s) : p. 1383-1393 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.
Dioxyde de silicium
Dioxyde de titane
Dispersions et suspensions
Isolants électriques
Matériaux hybrides
Métaux -- Revêtements protecteurs
Oxydes de chrome
Réaction de couplage
Rugosité
SilanesIndex. décimale : 667.9 Revêtements et enduits Résumé : Phosphate has been used as a coating agent in various fields, such as electrical steel (ES), because of its excellent electrical insulation and corrosion resistance. Although the insulating properties of a phosphate coating can significantly improve the iron loss of the ES sheet, a new coating material to enhance the performance of the ES sheet further should be developed. In this study, we synthesized organic–inorganic hybrid coating agents with superior insulation compared to that of the conventional phosphate coating agent. Inorganic particles with excellent insulating properties (SiO2, TiO2, and Cr2O3) and silane coupling agents were used as starting materials. The good surface modification of inorganic particles by silane coupling agents with appropriate solvent content in the coating agent led to good dispersion stability of the coating agent. Homogeneous dispersion of the coating agent was attributed to the good surface roughness of the hybrid materials coated on the ES. Finally, when the hybrid coating agent with optimized composition was applied to the ES, the insulation property of the hybrid coating (< 100 mA) was superior compared to that of the conventional phosphate coating (~ 200 mA), and corrosion resistance was also excellent. Note de contenu : - MATERIALS AND METHODS :
- Preparation of organic-inorganic hybrid coating agent
- Dispersion stability and evaluation of the properties of organic–inorganic hybrid coatings
- Characteristics of the electrical steel coated with organic–inorganic hybrid coating agents
- RESULTS AND DISCUSSION :
- Characteristics of organic-inorganic hybrid coating agents
- Evaluation of the characteristics of the electrical steel coated with the organic–inorganic hybrid coating agent
- Table 1 : Compositions of the organic–inorganic hybrid coating agentsDOI : https://doi.org/10.1007/s11998-022-00751-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00751-6.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39723
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Titre : Plasma deposition of silver nanoparticles onto poly(ethylene terephthalate) surfaces for the preparation of antimicrobial materials Type de document : texte imprimé Auteurs : Hanène Salmi-Mani, Auteur ; Grégory Balthazar, Auteur ; J. Atkins, Auteur ; Caroline Aymes-Chodur, Auteur ; Patrick Ribot, Auteur ; Gabriel Terreros, Auteur ; Nadine Barroca-Aubry, Auteur ; Christophe Regeard, Auteur ; Philippe Roger, Auteur Année de publication : 2023 Article en page(s) : p. 1395-1405 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Antibactériens
Argent
Caractérisation
Essais d'adhésion
Evaluation
Micro-ondes
Nanoparticules
Polyéthylène téréphtalate
Projection au plasma
Rayonnement ultraviolet
Revêtements
ThiolsIndex. décimale : 667.9 Revêtements et enduits Résumé : Poly(ethylene terephthalate) (PET) films were surface-modified according to microwave plasma activation allowing for dithiol functions grafting (1,6-hexanedithiol) in order to fabricate self-assembled photogenerated silver nanoparticles monolayers. The present study was carried out in constant discharge power conditions and the impact of the plasma treatment on PET wettability properties were reported. PET material modifications were characterized at various stages of the process : plasma activation, dithiol functionalization, and nanosilver grafting according to several experimental techniques : water contact angle measurements and X-ray photoelectron spectroscopy (XPS). The surface topography was studied by atomic force microscopy (AFM). Finally, antibacterial properties of PET material including silver nanoparticles were evaluated to determine the probability to reduce the surface bacterial adhesion of Staphylococcus aureus strain selected as pathogenic bacteria model. Surface grafted with silver nanoparticles was found to be particularly reactive and led to an inhibition of S. aureus adhesion around 96.2% in comparison with the unmodified PET material. Note de contenu : - EXPERIMENTAL PART
- General materials
- PET-plasma modification and thiol functionalization
- In situ photogeneration of silver nanoparticles
- Antibacterial activity assessment
- Bacterial adhesion tests
- Equipment and characterization
- Plasma reactor
- UV irradiation
- Contact angle measurements
- Atomic force microscopy (AFM) measurements
- X-ray photoelectron spectroscopy (XPS) measurements
- RESULTS AND DISCUSSION :
- Preliminary study : effect of plasma treatment
- Table 1 : Elemental composition (%) of untreated PET, PET-plasma, PET-plasma-SH, and PET-plasma-SH-Ag substratesTable 2 Water contact angles after each step of the treatment : (a) Untreated PET, (b) PET-plasma, (c) PET-plasma-SH, and (d) PET-plasma-SH-AgDOI : https://doi.org/10.1007/s11998-022-00752-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00752-5.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39724
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Titre : Investigation of EMI and UV-IR shielding properties of wool and cotton/elastane nanocomposite fabrics Type de document : texte imprimé Auteurs : Ilhami Ilhan, Auteur ; Mehmet Esen, Auteur ; Muharrem Karaaslan, Auteur ; Banu Yilmaz Akyürek, Auteur Année de publication : 2023 Article en page(s) : p. 1407-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Blindage (électricité)
CotonLe 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).
Elasthanne
Interférences électromagnétiques
Laine
Matériaux hybrides
Ondes électromagnétiques -- Absorption
Protection contre le rayonnement infrarouge
Protection contre le rayonnement ultraviolet
Rayonnement infrarouge -- Absorption
Rayonnement ultraviolet -- Absorption
Textiles et tissus à usages techniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, the electromagnetic interference (EMI) and ultraviolet–infrared (UV–IR) shielding behavior of wool (WO) and cotton/elastane (CO/EL) nanocomposite fabrics have been investigated. The study aims to investigate the EMI and UV–IR shielding performance of the CO/EL and wool-based fabrics coated with carbon (C), graphite (Gr), and indium (In) nanocomposite layers. To produce nanocomposite fabric samples, these three materials were used in different compositions and the coating processes were carried out by electron cyclotron resonance (ECR) and thermal evaporation methods. Subsequently, the EMI and UV–IR measurements were performed for the coated fabric samples, and the results have been analyzed. In this study, it has been proven for the first time that the ECR coating method can be used for coating fabrics as a textile material. Finally, it is found that the C+Gr(grid filled)+In wool sample and the carbon-coated CO/EL sample have widely exhibited a significant positive effect on increasing the EMI shielding performance in the range of 18–43 and 12–18 GHz frequencies, respectively. In addition, the results show that the C+Gr(grid)+C-coated CO/EL fabric has significant potential to increase the UV–IR shielding performance. Note de contenu : - MATERIALS AND METHODS :
- Experimental design and the materials
- Coating methods and principles
- Measurement process of EMI and UV–IR shielding performance
- RESULTS AND DISCUSSION :
- Analysis of EMSE performance
- Analysis of UV–IR absorption performance
- Table 1 : Properties of the coated woven fabric samples
- Table 2 : Experimental design to create the nanocomposite fabric samples
- Table 3 : Results of EDS analysis for the fabric samples
- Table 4 : Comparison of EMSE values of nanocomposite textile samples reported by the various experimental studiesDOI : https://doi.org/10.1007/s11998-022-00753-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00753-4.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39725
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Titre : Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt Type de document : texte imprimé Auteurs : Chao Lv, Auteur ; Ruiqing Shen, Auteur ; Yang Yang, Auteur ; Rui Shu, Auteur ; Guodong Li, Auteur ; Jingxian Liu, Auteur Année de publication : 2023 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Feutre (textiles et tissus)
Filtration
Matériaux -- Imprégnation
Matériaux aiguilletés
Polytétrafluoréthylène
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polytetrafluoroethylene (PTFE) emulsion is widely used as a coating material in the impregnation process for preparing polyphenylene sulfide (PPS) needle felts due to its excellent chemical stability and good mechanical properties. However, the effect of emulsion impregnation coating on the filtration performance of needle felts is still under debate. Moreover, in industrial applications with high temperatures, the service life of needle felts is directly affected by their thermal stability, but the pyrolysis and kinetic properties of PPS needle felt after PTFE emulsion impregnation post-processing have rarely been quantitatively investigated. In this study, the PPS fiber/PTFE emulsion (PPS/PTFE) composite needle felt was fabricated by a direct impregnation process. The pressure drop characteristic and mechanical collection efficiency of PPS needle felt and PPS/PTFE composite needle felt were comprehensively evaluated. It was found that the PTFE emulsion impregnation coating not only increases the pressure drop, but also decreases the collection efficiency. More specifically, for particles having a size below 2.5 μm, the decrement of collection efficiency further increases with the decrease of particle size, but the mechanical collection efficiency of PPS/PTFE composite needle felt for particles having larger size is almost the same as that of PPS needle felt. Three emulsion impregnation coating distribution models were inferred to systematically explain this experimental phenomenon. Additionally, the thermal degradation process of PPS needle felt and PPS/PTFE composite needle felt was analyzed, and several typical pyrolysis kinetic parameters were also determined theoretically. It was confirmed that the PTFE emulsion impregnation coatings can enhance the thermal stability of PPS needle felts. This work provides new insight into the rational application of the direct impregnation process as well as emulsion impregnation coating in the industrial filtration field. Note de contenu : - MATERIALS AND METHODS :
- Materials
- Preparation of PPS/PTFE composite needle felt
- Characterizations
- RESULTS AND DISCUSSION :
- Pressure drop characteristics and mechanical collection efficiency
- Thermal degradation process and reaction kinetics
- Table 1 : Information of experimental materialsDOI : https://doi.org/10.1007/s11998-022-00755-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00755-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39726
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Titre : Comparison of bio-based epoxide-diamine coatings prepared with acyclic and cyclic aliphatic diamines Type de document : texte imprimé Auteurs : Ilknur Babahan-Bircan, Auteur ; Jomin Thomas, Auteur ; Mark D. Soucek, Auteur Année de publication : 2023 Article en page(s) : p. 1435-1444 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bisphénol A
DiamineUne diamine est un type de polyamine contenant exactement deux groupes amine. Les diamines sont principalement utilisées comme monomères pour synthétiser des polyamides, des polyimides et des polyurées. La principale diamine produite est le 1,6-diaminohexane, précurseur du Nylon 6-6, suivie de l'éthylènediamine1. L'hydrazine (H2NNH2) n'est en général pas considérée comme une diamine puisque ce n'est ni une amine (pas de carbone), ni une dibase.
Epoxy amine
Huile de tungL'huile de tung ou "huile de bois de Chin" ou encore "huile d'abrasin" est une huile de couleur jaune d'or, tirée des graines mûres d'un arbre de la famille des Aleurites (Aleurites moluccana - le noyer de bancoule - ou de Vernicia fordii selon les sources). Elle est employée notamment comme huile siccative en peinture ou comme traitement de surface du bois. (Wikipedia)
Réactions chimiques
Réticulants
Revêtements -- Propriétés mécaniques
Revêtements organiques
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : As replacements for bisphenol-A, new bio-based and reactive epoxy-amine coatings have been investigated in this study. Bio-based precursor, epoxy-functionalized tung oil (ETO) was synthesized using glycidyl methacrylate (GMA) and tung oil via a Diels–Alder reaction according to our previous work. The new ETO-diamine-cured systems were prepared with the equivalent molar ratio at room temperature. ETO was cured with acyclic aliphatic (Jeffamine D400) and cyclic aliphatic (Epicure 3300) amines, at four temperatures ranging from 25 to 150°C. The coatings were then compared in terms of their thermal and mechanical properties. The cured coatings were analyzed by IR, thermogravimetric analysis (TGA), and gel content tests. TGA analysis showed that the epoxide-diamine polymers demonstrated thermal stability up to 170°C. The mechanical properties of the films were investigated by pendulum hardness, pencil hardness, cross-hatch adhesion, pull-off adhesion, impact resistance, reverse resistance, and chemical resistance testing. While all the cured systems exhibited good pencil hardness, cross-hatch adhesion, impact resistance, and reverse resistance properties, the epoxide-acyclic diamine system demonstrated greater pendulum hardness and notable pull-off adhesion at 150°C. The research demonstrates the potential for greener and more reactive tung oil-based epoxide coatings with enhanced properties. Note de contenu : - EXPERIMENTAL :
- Materials
- Instruments
- Synthesis of epoxy-functionalized tung oil (ETO)
- Preparation of epoxide-diamine coatings
- General coating properties
- RESULTS AND DISCUSSION :
- IR of epoxide-amine networks
- Thermogravimetric analysis (TGA) of epoxide-amine networks
- Gel content of the epoxide-amine networks
- General coating properties of epoxide-amine networks
- Table 1 : IR spectra of the epoxide-amine systems
- Table 2 : TGA results for epoxide-Jeffamine systems
- Table 3 : Gel content of coatings (%)
- Table 4 : General coating properties of the epoxide-amine systemsDOI : https://doi.org/10.1007/s11998-022-00756-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00756-1.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39727
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Titre : Acrylate boron silane polymer/carbon nitride–titanium dioxide composite coatings with enhancing photocatalytic antifouling performance under visible light Type de document : texte imprimé Auteurs : Yakun Li, Auteur ; Jianjun Liao, Auteur ; Haiqi Zhang, Auteur ; Xingsan Tang, Auteur ; Shiqiang Zhong, Auteur ; Qiuxia Li, Auteur Année de publication : 2023 Article en page(s) : p. 1445-1458 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Copolymère acrylate de bore silane
Dioxyde de titane
Formulation (Génie chimique)
Nitrure de carbone
Photocatalyse
Revêtement auto-nettoyant
Revêtements antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : Herein, a series of antifouling coatings (CTNCs) composed of acrylic boron silicon polymer (ABSP) and environmental-friendly photocatalysts C3N4-TiO2(B) heterojunctions were successfully prepared. Large-scale production and low-cost photocatalyst C3N4-TiO2(B) can be perfectly compounded with ABSP, realizing the possibility of engineering application. SEM and AFM analysis showed that the C3N4-TiO2(B) particles were firmly embedded in the coating, but serious agglomeration appeared when the content of the photocatalyst exceeds 7 wt%. The hydrophilic nanoparticles can accelerate the hydrolysis and adjust the self-polishing rates of the polymer matrix to repel bacteria and algae. When the content of C3N4-TiO2(B) was in the range of 5–7 wt%, the CTNCs displayed better resistance to Nitzschia closterium, Staphylococcus aureus and Escherichia coli than the coating containing pure C3N4, and the anti-bacterial rates towards S. aureus and E. coli can reach 99.72% and 98.96%. Note de contenu : - EXPERIMENTAL SECTION :
- Materials
- Preparation of TiO 2 (B) single-crystalline nanorods
- Preparation of C 3 N 4 -TiO 2 (B)
- Synthesis of ABSP
- Preparation of CTNCs
- Characterization
- RESULTS AND DISCUSSION :
- Structural characteristics of C 3 N 4 –TiO 2 (B) heterojunction
- Surface chemical states of C3N4-TiO2 heterojunction
- Surface morphology of CTNCs
- Surface wettability and self-polishing rates of CTNCs
- Diatom antisettling test
- Anti-bacterial test
- Environmental properties
- Antifouling mechanism of CTNCs
- Table 1 : The preparation formula of CTNCsDOI : https://doi.org/10.1007/s11998-022-00757-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00757-0.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39728
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Titre : Preparation and characterization of poly(lactic acid)-based contact-active antimicrobial surfaces Type de document : texte imprimé Auteurs : Figen Aynali, Auteur ; Erdinc Doganci, Auteur ; Huseyin Balci, Auteur ; Metin Cetin, Auteur ; Guralp Ozkoc, Auteur ; Hasan Sadikoglu, Auteur Année de publication : 2023 Article en page(s) : p. 1459-1475 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens
Caractérisation
Copolymères -- Synthèse
Dépôt par pulvérisation
Matériaux -- Propriétés barrières
Polylactique, AcideL'acide polylactique (anglais : polylactic acid, abrégé en PLA) est un polymère entièrement biodégradable utilisé dans l'alimentation pour l'emballage des œufs et plus récemment pour remplacer les sacs et cabas en plastiques jusqu'ici distribués dans les commerces. Il est utilisé également en chirurgie où les sutures sont réalisées avec des polymères biodégradables qui sont décomposés par réaction avec l’eau ou sous l’action d’enzymes. Il est également utilisé pour les nouveaux essais de stent biodégradable.
Le PLA peut-être obtenu à partir d'amidon de maïs, ce qui en fait la première alternative naturelle au polyéthylène (le terme de bioplastique est utilisé). En effet, l'acide polylactique est un produit résultant de la fermentation des sucres ou de l'amidon sous l'effet de bactéries synthétisant l'acide lactique. Dans un second temps, l'acide lactique est polymérisé par un nouveau procédé de fermentation, pour devenir de l'acide polylactique.
Ce procédé conduit à des polymères avec des masses molaires relativement basses. Afin de produire un acide polylactique avec des masses molaires plus élevées, l'acide polylactique produit par condensation de l'acide lactique est dépolymérisé, produisant du lactide, qui est à son tour polymérisé par ouverture de cycle.
Le PLA est donc l’un de ces polymères, dans lequel les longues molécules filiformes sont construites par la réaction d’un groupement acide et d’une molécule d’acide lactique sur le groupement hydroxyle d’une autre pour donner une jonction ester. Dans le corps, la réaction se fait en sens inverse et l’acide lactique ainsi libéré est incorporé dans le processus métabolique normal. On obtient un polymère plus résistant en utilisant l'acide glycolique, soit seul, soit combiné à l’acide lactique.
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements organiques
Surfaces antimicrobiennes
Toxicologie cellulaireIndex. décimale : 667.9 Revêtements et enduits Résumé : Poly(lactic acid) (PLA)-based contact-active antimicrobial surfaces were successfully fabricated via the spray coating method. For this purpose, firstly two separate antimicrobial polymers were synthesized by introducing alkyne functionalized quaternary ammonium salt into clickable copolymer containing 30 mol% and 5 mol% of quaternary ammonium salt on their backbones. Then, these synthesized polymers were applied to coat one surface of the neat PLA films (PLA/PEG, 90/10) at the rate of 5, 15, and 25 times, respectively. Afterward, the biocidal effect of these films was considered against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria by the way of contact-active method. It was observed that the films coated with polymer containing 30 mol% of quaternary ammonium salt (QAS), even at the lowest coating amount, showed a considerably active antimicrobial property against both bacteria. The thermal, mechanical, and barrier properties of coated films were also investigated. In addition, a cytotoxicity test was performed, and it was found that the PLA film was nontoxic when it was coated with polymer containing 5 mol% of quaternary ammonium salt, even at a high coating amount. For a polymer containing 30 mol% of quaternary ammonium salt on its backbone, it was necessary to coat the films at a low rate for acceptable cytotoxicity. In conclusion, due to the contact-active behavior of covalently attached antimicrobial agents, high antibacterial activity, suitable mechanical properties, and acceptable cytocompatibility, these antimicrobial surfaces can be considered as a potential candidate for bio-based materials. Note de contenu : - EXPERIMENTAL SECTION :
- Materials
- Synthesis of antimicrobial copolymers having antimicrobial agents bound covalently
- Film preparation
- Surface coating of PLA films with synthesized antimicrobial polymers (P1 and P2)
- Assessment of antimicrobial activity of the coated films
- Fourier transform infrared (FTIR) analysis
- Scanning electron microscopy (SEM)
- Mechanical properties
- Thermal properties
- Barrier properties
- Indirect cytotoxicity and cell viability assay
- RESULTS AND DISCUSSION :
- FTIR spectroscopy analysis
- Antimicrobial activity of films
- Scanning electron microscopy analysis
- Mechanical properties
- Thermal properties
- Barrier properties
- Cytotoxicity
- Table 1 : Thermal properties of the obtained polymers determined via DSC and TGA diagrams
- Table 2 : Barrier properties of the PLA films coated with P1DOI : https://doi.org/10.1007/s11998-022-00758-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00758-z.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39729
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Titre : Preparation and characterization of carbon black coated membranes for the treatment of saline water by membrane distillation Type de document : texte imprimé Auteurs : Mohamed E. A. Ali, Auteur ; Shimaa Elbakry, Auteur ; Moustafa Aboelfadl, Auteur ; Hosam Shawky, Auteur ; Qilin Li, Auteur ; Francois Perreault, Auteur Année de publication : 2023 Article en page(s) : p. 1477-1488 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Caractérisation
Distillation
Eau de mer -- Dessalement
Membranes (technologie)
Morphologie (matériaux)
Noir de carbone
Polyfluorure de vinylidène
Polytétrafluoréthylène
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : Membrane distillation (MD) is a promising approach to address water scarcity due to its capacity to achieve high water recovery in desalination. However, high energy consumption and decline in permeate flux are key issues of MD desalination. Nanophotonic materials like carbon black (CB) have been used to improve MD performance and reduce energy consumption in the presence of sunlight. In this article, we investigated different coating procedures for the formation of a uniform layer of CB particles on polytetrafluoroethylene (PTFE) and polyvinylidene fluoride membranes. The coated membranes were manufactured and characterized using Fourier-transform infrared spectroscopy and scanning electron microscopy. Contact angle measurements demonstrated an increase in hydrophilicity after CB was added. Both types of membranes exhibited an increase in permeate flux and salt rejection with the addition of CB, with the PTFE membrane coated with 0.5% of CB having the highest water flux, reaching 14.6 L/m2 h (LMH) compared to a commercial control having a flux of 8.0 LMH. The effects of different parameters on the performance of the hydrophilic CB-coated PTFE membrane were examined. The results demonstrated that the CB coating developed can be advantageous to improve the performance of MD membranes. Note de contenu : - EXPERIMENTAL :
- Materials
- Preparation of CB coating layer on PTFE or PVDF membranes
- Material characterization
- Evaluation of MD membrane performance
- RESULTS AND DISCUSSION :
- FTIR analysis
- Membrane morphology
- Contact angle measurements
- Performance of MD membrane
- Table 1 : An overview of other MD membranes modified with similar coating materials
- Table 2 : Total organic carbon (TOC) release from CB NPs coated the membranes of PTFE and PVDFDOI : https://doi.org/10.1007/s11998-022-00759-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00759-6.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39730
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Titre : Mechanical, thermal, and surface properties of fusion-bonded epoxy nanocomposite coatings Type de document : texte imprimé Auteurs : Baha Demir, Auteur ; Ahmed F. Abdelaal, Auteur ; Mirza Murtuza, Auteur ; Ali Baig, Auteur ; Abdul Samad Mohammed, Auteur Année de publication : 2023 Article en page(s) : p. 1489-1498 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine
Angle de contact
Charges (matériaux)
Dioxyde de titane
Epaisseur -- Mesure
Epoxydes
GraphèneLe 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.
Mesure
Nanoparticules
Nanotubes
Oxyde de cérium
Revêtement époxy lié par fusion
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements organiques
Thermocinétique
TitaneIndex. décimale : 667.9 Revêtements et enduits Résumé :
Epoxy coatings have generally been used in applications that require the surfaces to be protected against corrosion. However, their use in demanding applications wherein the contacting surfaces are required to be protected against wear and tear has been limited due to their inferior mechanical and thermal properties. To overcome this challenge, epoxy composite coatings came into being, wherein the epoxy resin is reinforced with different fillers. However, due to the availability of a large variety of fillers, the selection of a suitable filler and the amount to be used in the epoxy resin for the best properties still remains a challenge. Hence, the focus of this research is to compare the performance of five different fillers, viz. carbon nanotubes (CNTs), graphene (GO), alumina (Al2O3), titanium dioxide (TiO2), and ceria (CeO2) in enhancing the mechanical, thermal, and surface properties of epoxy coatings. The five fillers selected covered the spectrum of carbon based, ceramic, and metallic oxide fillers. Different loadings (0.5, 1.5, and 3 wt%) of each of the fillers were used to fabricate fusion-bonded epoxy composite coatings on mild steel coupons using an electrostatic spray gun. The effect of these fillers was evaluated on the hardness, thermal conductivity, and water contact angle of the epoxy composite coatings. It was observed from the results that 0.5 wt% of Al2O3 was found to be the best-performing filler among all the fillers in terms of higher hardness and 3 wt% of Al2O3 was best in terms of thermal conductivity as compared to the pristine epoxy coatings and other epoxy composite coatings.Note de contenu : - EXPERIMENTAL PROCEDURES :
- Powder preparation
- Coating preparation
- Microhardness
- Surface properties
- Thermal conductivity
- Scanning electron microscopy (SEM)
- Coating thickness measurements
- RESULTS AND DISCUSSION :
- SEM evaluation of the morphology of the different epoxy nanocomposite coatings
- Effect of different loadings of different fillers on the hardness of the epoxy nanocomposite coatings
- Effect of different loadings of different fillers on the thermal conductivity of the epoxy nanocomposite coatings
- Effect of different loadings of different fillers on the surface roughness of the epoxy nanocomposite coatings
- Effect of different loadings of different fillers on the water contact angle of the epoxy nanocomposite coatings
- The best-performing filler in terms of hardness and thermal conductivity
- Table 1 Surface roughness measurements of CNT, GO, ceria, TiO2, and Al2O3 at weight percent from 0.5, 1.5 to 3% in μm
- Table 2 Water contact angle measurements of CNT, GO, ceria, TiO2, and Al2O3 at weight percents from 0.5, 1.5 to 3% in degreesDOI : https://doi.org/10.1007/s11998-022-00760-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00760-z.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39731
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1489-1498[article]Réservation
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