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Steering and in situ monitoring of drying phenomena during film fabrication / Fabien Scheepers in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1213-1221 Titre : Steering and in situ monitoring of drying phenomena during film fabrication Type de document : texte imprimé Auteurs : Fabien Scheepers, Auteur ; Andrea Stähler, Auteur ; Markus Stähler, Auteur ; Marcelo Carmo, Auteur ; Werner Lehnert, Auteur ; Detlef Stolten, Auteur Année de publication : 2019 Article en page(s) : p. 1213-1221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de verre Electrodes Enduction par filière Polytétrafluoréthylène Revêtements -- Défauts Revêtements -- Fissuration Revêtements organiques Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : During film fabrication, the phenomena of crack formation and delamination are often observed, dramatically hindering the discovery and characterization of new materials for energy applications. In this work, we report on a novel approach to fully steer the drying parameters or “knobs” that are commonly used during electrode manufacture. It allows us to precisely in situ control and monitor the solvent-specific evaporation rates that affect the development of suspension composition during drying. We managed to control the capillary stress inside the layer by precisely controlling the selectivity of solvent evaporation. Large cracks result when the surface tension increases over time and layer delamination occurs. When using an n-propanol/water system, critical crack formation is achieved when water is enriched by decreasing the gas exchange during drying or preloading the gas phase with water vapor. High gas exchange rates inhibit the water’s enrichment, and therefore, only small surface cracks develop. The experiments also surprisingly indicate that the drying temperature has no significant effect on crack formation. These results are of fundamental meaning for the future development of electrodes as the drying step has a high impact on the products specification and now can be ultimately controlled. The future development of electrodes will surely benefit from this achievement in the controlled fabrication of films for a variety of applications. Note de contenu : - EXPERIMENTAL : Principle - Slot die coating - Drying test station - RESULTS AND DISCUSSION : Variation in suspension composition/concentration - Variation in drying parameters DOI : 10.1007/s11998-019-00206-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00206-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33004 [article]

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Colloidal, morphological, thermal, rheological, and film properties of waterborne hyberbranched alkyd-acrylic resins / Edwin A. Murillo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1223-1232 Titre : Colloidal, morphological, thermal, rheological, and film properties of waterborne hyberbranched alkyd-acrylic resins Type de document : texte imprimé Auteurs : Edwin A. Murillo, Auteur ; Judith Percino, Auteur ; Betty L. Lopez, Auteur Année de publication : 2019 Article en page(s) : p. 1223-1232 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Colloides -- Stabilité Copolymère alkyde acrylique Polymères -- Analyse Polymères en émulsion Polymères ramifiés Potentiel zeta Rhéologie Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne hyperbranched alkyd–acrylic resins (HAAR) are interesting materials that provide excellent properties yet require only low levels of solvent in formulations using them. However, they have been scarcely studied. Therefore, the goal of this work was to prepare and evaluate various properties of HAAR. These materials were obtained by miniemulsion polymerization from a hyperbranched alkyd resin (HAR), methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA). The proportions of HAR:acrylic monomers were as follow: 50:50 (HAAR1), 40:60 (HAAR2), 30:70 (HAAR3), and 20:80 (HAAR4). The particle size increased with the content of HAR, but the colloidal stability, critical deformation, zeta potential, thermal stability, and hardness followed an opposite behavior. The order of colloidal stability of the HAAR miniemulsions was HAAR4 > HAAR3 > HAAR2 > HAAR1. The particle morphology of the HAAR was mainly core–shell, but acrylic and alkyd particles were also observed. In addition, all HAAR initially exhibited a reduction in complex viscosity (η*) with the increase in angular frequency. The thermal stability of the HAR was lower than that of the HAAR. The HAAR showed better resistance against a 0.10 M sodium hydroxide (NaOH) solution than HAR. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the HAAR - Characterization - RESULTS AND DISCUSSION : IR analysis - DLS analysis - Zeta potential - Contact angle analysis - TEM analysis - TGA - Rheological analysis - Film properties DOI : 10.1007/s11998-019-00205-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00205-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33006 [article]

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Synthesis and properties of fluorinated non-isocyanate polyurethanes coatings with good hydrophobic and oleophobic properties / Zhijun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1233-1241 Titre : Synthesis and properties of fluorinated non-isocyanate polyurethanes coatings with good hydrophobic and oleophobic properties Type de document : texte imprimé Auteurs : Zhijun Wu, Auteur ; Liuyan Tang, Auteur ; Jingtao Dai, Auteur ; Jinqing Qu, Auteur Année de publication : 2019 Article en page(s) : p. 1233-1241 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Carbonate cyclique Fluoropolymères Hydrophobie Oléophobie Polymères -- Synthèse Revêtements organiques Revêtements sans isocyanates Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the chemical resistance of non-isocyanate polyurethane (NIPU), two kinds of diglycidyl ether, bisphenol AF (E-AF) and perfluorooctyl glycidyl ether (PFGE), were selected to synthesize two different cyclic carbonates, bisphenol AF (EC-AF) and perfluorooctyl cyclic carbonate (PFGC), respectively. These cyclic carbonates were successfully used to prepare fluorine-containing non-isocyanate polyurethane coatings. The effects of PFGC amounts on the properties of NIPU were studied, and it was found that the contact angles of water, diiodomethane, and hexadecane were increased with the addition of PFGC and up to 106.7°, 80.2°, and 72.7°, respectively, whereas the pendulum hardness of NIPU coatings relatively decreased with the increase in PFGC contents. The NIPU coatings exhibited excellent flexibility, adhesion, and impact resistance. They also displayed good thermal stability with 5% weight loss temperature (T5%) ranging from 249 to 271°C. Moreover, these coatings possessed very low water uptake, excellent hydrophobic/oleophobic properties, and corrosion resistance properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of EC-AF and PFGC - Preparation of NIPU coatings - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of EC-AF and PFGC - Synthesis and characterization of NIPU coatings DOI : 10.1007/s11998-019-00195-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00195-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33007 [article]

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Facile fabrication of fluorine–silicon-containing poly (styrene–acrylate)/SiO2 hydrophobic composites by combining physically mixing and sol–gel process / Lingyun Ye in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1243-1252 Titre : Facile fabrication of fluorine–silicon-containing poly (styrene–acrylate)/SiO2 hydrophobic composites by combining physically mixing and sol–gel process Type de document : texte imprimé Auteurs : Lingyun Ye, Auteur ; Guanhao Ma, Auteur ; Shaona Zheng, Auteur ; Xiangxuan Huang, Auteur ; Lili Zhao, Auteur ; Hongbin Luo, Auteur ; Wenbo Liao, Auteur Année de publication : 2019 Article en page(s) : p. 1243-1252 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Copolymère styrène acrylate Dioxyde de silicium Fluor Gel de silice Hydrophobie Sol-gel, Procédé Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Novel hydrophobic composites (FS-PSA/SiO2) were prepared by directly physically mixing fluorine–silicon-containing poly (styrene–acrylate) latexes (FS-PSA) with colloidal silica. Sol–gel processes were carried out between silica particles and silanol groups on the surface of poly (styrene–acrylate) latexes to enhance the roughness and hydrophobicity of composite films. TEM photos revealed that FS-PSA latexes exhibited a clear core–shell structure, and the intermolecular hydrogen bonding guaranteed the uniform dispersion of silica particles. The average diameter data indicated that the copolymerization and sol–gel process had all increased the average diameter of the composite latexes. FTIR and XPS spectra confirmed that two kinds of Si–O bonds existed in the composite films, of which one was related to the Si–O groups of colloidal silica while the other was related to the Si–O–Si groups obtained from the sol–gel processes. SEM and AFM images revealed that the sol–gel processes had increased the roughness of the composite films. The water contact angle (WCA) of the composite films were found to increase with the copolymerization and sol–gel processes. Thermogravimetric analysis (TGA) curves demonstrated that the FS-PSA/SiO2 composite films exhibited much better thermal stability than the PSA and FS-PSA films. Note de contenu : - EXPERIMENTAL : Materials - Preparation of poly(styrene-acrylate) (PSA) and fluorine-silicone-containing poly(styrene-acrylate) materials (FS-PSA) - Preparation of FS-PSA/SiO2 composites - RESULTS AND DISCUSSION : The preparation of the FS-PAS and FS-PAS/SiO2 composites - The chemical structure - The surface wetting property and surface morphology - Formation mechanism of composite films - The thermal stability DOI : 10.1007/s11998-019-00198-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00198-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33008 [article]

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Layer-by-layer films based on polyaniline, titanate nanotubes, and cetyl trimethyl ammonium bromide for antifungal coatings / Natalia de Araujo Dionisio in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1253-1262 Titre : Layer-by-layer films based on polyaniline, titanate nanotubes, and cetyl trimethyl ammonium bromide for antifungal coatings Type de document : texte imprimé Auteurs : Natalia de Araujo Dionisio, Auteur ; Emmanuel Airton de Oliveira Farias, Auteur ; Thiago Araùjo, Auteur ; Patrick Veras Quelemes, Auteur ; Alyne Rodrigues de Araujo, Auteur ; Fernanda Machado Fonseca, Auteur ; Ludyane Nascimeto Costa, Auteur ; José Milton E. Matos, Auteur ; José Roberto S. A. Leite, Auteur ; Peter Eaton, Auteur ; Carla Eiras, Auteur Année de publication : 2019 Article en page(s) : p. 1253-1262 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Bromure de cétyl-triméthyl-ammonium Nanotubes Polyacrylonitrile Revêtements multicouches Revêtements organiques Titanates Les titanates sont des composés inorganiques dont la composition combine un oxyde de titane à un autre oxyde. Le terme est parfois utilisé plus généralement pour tout composé comportant un anion du titane, par exemple [TiCl6]2− et [Ti(CO)7]2−. On connaît un grand nombre de titanates, dont plusieurs ont une importance économique. Ce sont typiquement des matériaux blancs, diamagnétiques, à haut point de fusion et insolubles dans l'eau, que l'on prépare généralement à haute température (par exemple en utilisant un four tubulaire (en)) à partir de dioxyde de titane1. Plusieurs titanates sont connus à l'état naturel, c'est-à-dire sous la forme de minéraux, dont les principaux sont l'ilménite FeTiO3 et la pérovskite CaTiO3. Dans la quasi-totalité des cas, le titane a dans les titanates une coordination octaédrique (coordinence 6). Dans les cristaux de titanates il n'y a pas toujours un oxoanion du titane bien identifié (comme [TiO3]2− ou [TiO4]4−) mais souvent un cation Ti4+ ou des situations intermédiaires. (Wikipedia) Index. décimale : 667.9 Revêtements et enduits Résumé : Layer-by-layer (LbL) films have been developed for multiple applications, including functional coatings with antimicrobial activity. In this work, we describe the development of LbL films based on polyaniline (PANI), titanate nanotubes (TiNTs-Na2Ti3O7), and cetyl trimethyl ammonium bromide (CTAB) for applications in antifungal coatings. The LbL films were characterized by spectroscopy in the UV–visible region, cyclic voltammetry, scanning electron microscopy, and atomic force microscopy. Among various films architectures tested, the PANI(TiNTs)/CTAB film was more promising for the suggested applications. This film showed excellent activity against Cryptococcus neoformans fungi, showing inhibition zones. The material developed in this work is a candidate for coating of air conditioning pipes, for instance, since besides the antifungal activity, it also adds the anticorrosive and air-purifying properties present in PANI and TiNTs. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Solutions used in the preparation of films - Preparation of layer-by-layer films - TiNTs characterization - LbL films characterization - Antifungal effect of the film with 20 bilayers of PANI(TiNTs)/CTAB - RESULTS AND DISCUSSION : TiNTs characterization - Characterization of bilayer films by UV-Vis spectroscopy - Electrochemical characterization by cyclic voltammetry - Morphological characterization - Evaluatioin of antifungal effect of the developed film DOI : 10.1007/s11998-019-00199-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00199-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33009 [article]

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A novel approach for new cost-saving durable anticorrosive and antibacterial coatings / Walaa M. Abd El-Gawad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1263-1281 Titre : A novel approach for new cost-saving durable anticorrosive and antibacterial coatings Type de document : texte imprimé Auteurs : Walaa M. Abd El-Gawad, Auteur ; Nivin M. Ahmed, Auteur ; Wael S. Mohamed, Auteur ; Eglal R. Souaya, Auteur Année de publication : 2019 Article en page(s) : p. 1263-1281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétate de vinyle L'acétate de vinyle est l'ester de l'acide acétique (acide éthanoïque) avec le tautomère alcoolique de l'éthanal (acétaldéhyde) et de formule semi-développée, CH3COO–CH=CH2. L'acétate de vinyle est préparé, en règle générale, en phase vapeur, en faisant réagir un grand excès d'acétylène sur de l'acide acétique (200 °C) en présence de catalyseurs au zinc et au cadmium). On obtient un liquide incolore à odeur très pénétrante qui ne se polymérise en polyacétate de vinyle (PVAC) qu'en présence de catalyseurs et donne des solides durs très stables à la chaleur. Il peut être copolymérisé avec d'autres composés vinyliques ou d'autres monomères. Antibactériens Anticorrosifs Anticorrosion Copolymérisation Essais accélérés (technologie) Evaluation Matériaux -- Propriétés fonctionnelles Matériaux hybrides Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Zéolites Index. décimale : 667.9 Revêtements et enduits Résumé : Multifunctional coatings that perform various actions simultaneously are now of prevailing importance, with zeolites being one of the most useful materials in this field. In this work, Na-P-zeolite was prepared from kaolin and subjected to a cation-exchange process to replace Na+ by Cu2+ and/or Zn2+ to achieve anticorrosive and antibacterial effects. In situ emulsion polymerization of vinyl acetate-vinyl versatate (VAc-VEOVA) copolymer at the nanoscale with P-zeolite and Zn-, Cu-, Zn/Cu-cation-exchanged P-zeolites was then applied to obtain P-zeolite-(VAc-VEOVA), Zn-P-zeolite-(VAc-VEOVA), Cu-P-zeolite-(VAc-VEOVA), and Zn/Cu-P-zeolite-(VAc-VEOVA) nanocomposites. Anticorrosive and antibacterial tests were then carried out on films containing the different nanocomposites using laboratory accelerated testing, electrochemical impedance spectroscopy (EIS), and the disc well diffusion method with different types of Gram-positive (G+) and Gram-negative (G−) bacteria, revealing that the film containing the mixed (Zn/Cu)-P-zeolite showed the best anticorrosive and antibacterial performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of P-zeolite - Prepration of cation-exchanged P-zeolites - Preparation of (VAc-VEOVA) copolymer nanocomposites by in situ emulsion polymerization - Paint preparation - Preparatin of steel panels for anticorrosion testing - Preparation of specimens for antibacterial testing - METHODS OF TESTING AND EVALUATION OF PAINTS : Anticorrosion measurements - RESULTS AND DISCUSSION : Characterization of P-zeolite and cation-exchanged P-zeolites - Characterization of the prepared nanocomposites - Anticorrosion performance of paints containing P-zeolite and cation-exchanged P-zeolites - Antibacterial results for cation-exchanged P-zeolites and their paint formulations DOI : 10.1007/s11998-019-00202-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00202-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33010 [article]

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Polymethylsilsesquioxane powder prepared by morphology-controlled growth and its composite with waterborne latex for superhydrophobic coating fabrication / Baiyu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1283-1294 Titre : Polymethylsilsesquioxane powder prepared by morphology-controlled growth and its composite with waterborne latex for superhydrophobic coating fabrication Type de document : texte imprimé Auteurs : Baiyu Li, Auteur ; Chunxiao Zhang, Auteur ; Fei Jing, Auteur ; Xiang Li, Auteur ; Naipu He, Auteur ; Zaiman Liu, Auteur Année de publication : 2019 Article en page(s) : p. 1283-1294 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Hydrophobie Latex Polyméthylsilsesquioxane Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The incompatibility of superhydrophobic particles with waterborne latexes impedes the direct mixing of them to make mixtures for superhydrophobic coatings fabrication. Polymethylsilsesquioxane (PMSQ) prepared by methyltrialkoxysilane precursors can change from hydrophilic to hydrophobic with the increased degree of condensation. This property makes PMSQ suitable for compounding with waterborne latexes for highly hydrophobic coatings fabrication. The present work presents a method for the morphology control of PMSQ to make highly porous PMSQ particles with micro-/nano-roughness on the surface. A gel of PMSQ was first prepared in aqueous medium and broken into small pieces by a high speed homogenizer; additional acid-catalyzed hydrolyzate of methyltrimethoxysilane was added to this dispersion of broken particles. The following base-catalyzed regrowth of PMSQ on the preformed gel skeleton gave highly porous PMSQ powder suitable for compounding with waterborne latexes. The composite of PMSQ wet powder and a styrene-acrylate waterborne latex gave a superhydrophobic coating after drying in ambient condition, of which the water contact angle reaches 153.1° and sliding angle is low to 28.7°. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PMSQ gel - Base-catalyzed regrowth in the environmnet of preformed gel small pieces - Preparation of composite coatings of PMSQ powder and waterborne latex - Characterization - RESULTS AND DISCUSSION : Gel formation - Base-catalyzed regrowth of PMSQ in the preformed gel dispersion - Composite coatings of PMSQ wet powder and waterborne latex DOI : 10.1007/s11998-019-00204-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00204-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33011 [article]

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Influence of nano-silica and polyethylene wax on the scratch behavior of acrylic-based polyurethane coatings / S. Y. Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1295-1303 Titre : Influence of nano-silica and polyethylene wax on the scratch behavior of acrylic-based polyurethane coatings Type de document : texte imprimé Auteurs : S. Y. Lee, Auteur ; W.-Y. Jung, Auteur ; J.-B. Shin, Auteur ; J.-I. Weon, Auteur Année de publication : 2019 Article en page(s) : p. 1295-1303 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse de dommages (matériaux) Brillance (optique) Cires Copolymère uréthane acrylique Essais (technologie) Luminosité Nanoparticules Polyéthylène Rayures Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : The scratch behavior and resistance of acrylic-based polyurethane coatings were studied. The effects of fumed silica and polyethylene wax were investigated using an area-contact scratch tip, which can apply a constant load to the coating surfaces at a relatively low stress level. Measurements of the normalized changes in gloss (%Gn) and luminance (%Ln) could be provided as reliable and meaningful methodologies for estimating the scratch resistance and subtle damage to polymeric coating surfaces. A higher gloss-valued coating surface has better scratch resistance. The addition of nano-silica particles provides the increases in hardness, transparency, and resistance to scratch damage for the acrylic-based polyurethane surface, whereas the polyethylene wax contributes to the increases in gloss and smoothness for the coating surface. The surface characteristics observed are responsible for the improved scratch performance of the acrylic-based polyurethane coating surface. Note de contenu : - EXPERIMENTAL : Materials - Scratch test methodology - Scratch damage analysis - Surface characterization - RESULTS AND DISCUSSION : Scratch behavior and analysis - FTIR analysis - XPS analysis DOI : 10.1007/s11998-019-00207-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00207-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33012 [article]

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UV-curable waterborne epoxy acrylate coating modified by monomethacryloyloxy-terminated fluorinated oligomer / Hongyi Shi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1305-1316 Titre : UV-curable waterborne epoxy acrylate coating modified by monomethacryloyloxy-terminated fluorinated oligomer Type de document : texte imprimé Auteurs : Hongyi Shi, Auteur ; Weiqu Liu, Auteur ; Chunhua Liu, Auteur ; Sha He, Auteur ; Chi Jiang, Auteur ; Zhengfang Wang, Auteur Année de publication : 2019 Article en page(s) : p. 1305-1316 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère époxy acrylate Emulsifiants Energie de surface Fluoropolymères Oligomères Polymères en émulsion Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Monomethacryloyloxy-terminated fluorinated oligomers (PPFOMA-GMA and PHFBMA-GMA) and methyl allyl alcohol polyoxyethylene ether-modified epoxy resin (HPEGEA) were successfully synthesized and used as reactive additives and emulsifier for epoxy acrylate, respectively. FTIR, 1H NMR, and GPC were used to characterize the structures of PPFOMA-GMA, PHFBMA-GMA, and HPEGEA. The influence of the concentrations of PPFOMA-GMA and PHFBMA-GMA on the properties of waterborne epoxy acrylate (WEA) resin coatings was investigated. The surface energy of waterborne epoxy acrylate coating was decreased from 38.20 mN/m to 15.31 mN/m by adding just 0.21 wt% PPFOMA-GMA, indicating its high effectiveness in improving the hydrophobic properties of the surface. The surface compositions of the WEA resin coatings (with 0.85 wt% PPFOMA-GMA or 0.85 wt% PHFBMA-GMA) were characterized by XPS. The XPS results confirmed the quantitative enrichment of fluorine atoms on the surface. What is more, the physical properties of waterborne epoxy acrylate coatings prepared with different concentrations of fluorinated reactive additive, such as optical transmittance, adhesion (on glass, PET, and tinplate), pencil hardness, water absorption, and thermal properties, were also analyzed in detail. Hence, the waterborne epoxy acrylate coatings prepared with low concentrations of reactive additives were economical and have potential for large-scale industrial applications. Note de contenu : - EXPERIMENTAL : Materials -Synthesis of PPFOMA-GMA and PHFBMA-GMA - Synthesis of EA and HEPGEA - Preparation of UV-curable waterborne epoxy acrylate - Preparation of UV-curable waterborne epoxy acrylate coatings - Characterization - RESULT AND DISCUSSION : Chracterization of PHFBMA-GMA and PPFOMA-GMA, and HPEGEA - Surface properties of F0, F1, F2, F3, and F4 coating - Surface compositions of F1, F2, F3, and F4 coating - Pencil hardness, adhesion, and water absorption of F1, F2, F3, and F4 coating - Thermal properties of F1, F2, F3, and F4 coating - Optical properties of F1, F2, F3, and F4 coating DOI : 10.1007/s11998-019-00209-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00209-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33013 [article]

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Electrophoretically deposited graphene oxide–polymer bilayer coating on Cu-Ni alloy with enhanced corrosion resistance in simulated chloride environment / Geetisubhra Jena in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1317-1335 Titre : Electrophoretically deposited graphene oxide–polymer bilayer coating on Cu-Ni alloy with enhanced corrosion resistance in simulated chloride environment Type de document : texte imprimé Auteurs : Geetisubhra Jena, Auteur ; S. C. Vanithakumari, Auteur ; S. R. Polaki, Auteur ; R. P. George, Auteur ; John Philip, Auteur ; G. Amarendra, Auteur Année de publication : 2019 Article en page(s) : p. 1317-1335 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse électrochimique Anticorrosifs Anticorrosion Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Métaux -- Revêtements protecteurs Oxyde de graphène Polarisation (électricité) Polyacryliques Revêtements multicouches Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : An environmentally benign and facile bilayer coating comprised of graphene oxide (GO) and acrylic polymer is fabricated over cupronickel sample using electrophoretic deposition followed by dip coating. The infrared, Raman, and field emission scanning electron microscopy (FESEM) studies of the bilayer coating confirm the noncovalent functionalization of GO through H-bonding with acrylic polymer, reduction in local defects in GO structure, and distorted spherical void peripheries of polymer coating, respectively. The FESEM cross-sectional analysis showed that the coating thickness is 5–6 µm. The bilayer-coated sample showed a three- to fourfold increase in the corrosion resistance, as compared to GO-alone-coated sample in 3.5% (w/v) NaCl electrolyte, which is attributed to the reduction in the local defects in GO coating and the galvanic coupling between the GO and sample surface. The GO sheets make the diffusion pathway of corrosive media more tortuous for corrosive ions to reach the metal surface. The lower anodic current density observed with the new bilayer coating after 30 days of exposure confirms the active corrosion protection. The coating was intact and stable after 30 days of exposure in chloride medium with a water uptake of about 32.7%. Note de contenu : - EXPERIMENTAL METHODS : Materials - GO coating on Cu-Ni alloy by electrophoretic deposition (EPD) - Post-treatment of GO-coated Cu-Ni with acrylic-based polymer - Characterization of coatings before exposure - Electrochemical studies - Long-term exposure studies - RESULTS AND DISCUSSION : Characterization of coatings before exposure - Electrochemical characterization - Elucidating the mechanism of corrosion protection performance - Long-term exposure studies - Electrochemical characterization under long-term exposure - Characterization of uncoated and Go-polymer bilayer-coated Cu-Ni samples after long-term exposure DOI : 10.1007/s11998-019-00213-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00213-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33014 [article]

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High electrical conductivity waterborne inks for textile printing / Muhammad Ali in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1337-1349 Titre : High electrical conductivity waterborne inks for textile printing Type de document : texte imprimé Auteurs : Muhammad Ali, Auteur ; Long Lin, Auteur ; D. Cartridge, Auteur Année de publication : 2019 Article en page(s) : p. 1337-1349 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Conduction électrique Dispersions et suspensions Encre d'imprimerie Encre en phase aqueuse Essais (technologie) Impression sur étoffes Liants Noir de carbone Pigments Textiles et tissus à usages techniques Index. décimale : 667.2 Colorants et pigments Résumé : Printing of conductive inks is an attractive means of manufacturing of electronic components on flexible substrates including textiles. The textiles thus produced are often referred to as “e-textiles.” When high electrical conductivity is required, inks are preferably made from metal nanoparticles such as silver. However, such inks are expensive and generally not known to withstand severe washing and wearing to which textiles are normally subjected during the end use. In the present study, which forms a part of a larger study by the authors, waterborne dispersions of conductive grades of carbon black were converted into finished inks followed by washing and creasing tests to ascertain the durability of these inks. We found that not only were the inks stable after letdown with different binders, but they possessed high electrical conductivity despite the fact that the final pigment loading in all of the formulated inks was significantly less than the pigment loading that is generally found in commercial conductive inks. In addition, the electrical conductivity after washing and creasing tests of the formulated inks was found to be significantly greater than that of the tested commercial conductive inks. This shows that using large surface area, highly conductive grades of carbon black pigments in relatively small amounts in inks for textile printing is beneficial in achieving some of the critically required characteristics, particularly those pertaining to durability of the ink film. Note de contenu : - MATERIALS : Pigment dispersions - Binders - Commercial conductive inks - Substrates - METHODS : Letdown procedure to formulate finished inks - Sample preparation - Durability testing of inks - Electrical characterization - RESULTS AND DISCUSSION : Letdown stability of finished inks - Printing and testing on textile substrates - Resistivity of multiple ink layers DOI : 10.1007/s11998-019-00214-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00214-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33015 [article]

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Formulation development and characterization of highly water-soluble drug-loaded extended-release pellets prepared by extrusion–spheronization technique / Muhammad Iqbal Nasiri ; Rabia Ismail Yousuf ; Muhammad Harris Shoaib ; Kamran Zaheer ; Tariq Ali ; Kamran Ahmed ; Faaiza Qazia ; Sohail Anwer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1351-1365 Titre : Formulation development and characterization of highly water-soluble drug-loaded extended-release pellets prepared by extrusion–spheronization technique Type de document : texte imprimé Auteurs : Muhammad Iqbal Nasiri, Auteur ; Rabia Ismail Yousuf, Auteur ; Muhammad Harris Shoaib, Auteur ; Kamran Zaheer, Auteur ; Tariq Ali, Auteur ; Kamran Ahmed, Auteur ; Faaiza Qazia, Auteur ; Sohail Anwer, Auteur Année de publication : 2019 Article en page(s) : p. 1351-1365 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ethylcellulose Extrusion sphéronisation Formulation (Génie chimique) Granulés plastiques Hydrochlorure d'itopride Médicaments Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The objectives of current study were (a) to prepare extended-release plain (without polymers) and matrix pellets of itopride hydrochloride (ITP) by extrusion and spheronization technique, (b) to control the initial fast release of drug from the matrix pellets by coating using ethylcellulose, Eudragit® RL/RS100 (2:1), and Kollicoat® SR 30D, and (c) to investigate the influence of different types and concentration of coating polymers on release of highly water-soluble drug. The plain pellet contained microcrystalline cellulose and lactose without polymer, whereas matrix pellet formulations were composed of hydroxypropyl methylcellulose (HPMC K4M, K15M, and K100M) and ethylcellulose (EC 7 cps). Matrix pellet formulations failed to control the drug release, up to targeted period of 12 h. Five pellet formulations—one without polymer (F1) and one from each polymer category (F4, F7, F10, and F13)—were screened out for coating using different types and levels of polymers. The DDSolver (an add-in software for MS Excel) was used to analyze the dissolution profile data for drug release kinetics. However, drug release from pellet formulation (F7) containing HPMC as a matrix former and coated with EC followed zero-order kinetics (R2 = 0.897–0.998). The release mechanism of EC-coated formulations F7, F10, and F13 was non-Fickian diffusion (anomalous transport), whereas F1 and F4 were Fickian diffusion mechanism. The stability studies of all 5% EC-coated ITP pellet formulations were conducted at room and accelerated temperature as per ICH guidelines, and results were found satisfactory. It is concluded that ethylcellulose other than Eudragit® RL/RS100 (2:1) and Kollicoat® SR 30D was found to be an excellent release controlling agent for ITP which showed good controlled-release characteristics. Note de contenu : - Materials - Methods - Physical and chemical evaluation of pellet formulations - Image analysis - In vitro drug release studies - Effect of EC coating on pellet formulations - Effect of Eudragit RL/RS 100 coating on pellet formulations - Effect of Kollicoat SR 30D coating on pellet formulations - Effect of dissolution medium on drug release - Ethylcellulose-coated pellet formulations - Eudragit RL/RS 100-coated pellet formulations - Kollicoat SR 30D-coated pellet formulations - Drug release kinetic studies - Kinetics of EC-coated pellets - Kinetics of Eudragit RL/RS100-coated pellets - Kinetics of Kollicoat SR 30D-coated pellets - Drug release mechanism - Stability studies DOI : 10.1007/s11998-019-00211-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00211-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33016 [article]

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Electrophoretic deposition of waterborne ultraviolet (UV)-curable coatings based on microgels / Junhua Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1367-1378 Titre : Electrophoretic deposition of waterborne ultraviolet (UV)-curable coatings based on microgels Type de document : texte imprimé Auteurs : Junhua Chen, Auteur ; Teng Yuan, Auteur ; Weiping Tu, Auteur ; Kaimei Peng, Auteur ; Jianqing Hu, Auteur ; Feng Wang, Auteur Année de publication : 2019 Article en page(s) : p. 1367-1378 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt électrophorétique Microgels Un microgel est un gel formé à partir d'un réseau de filaments microscopiques de polymères Polyéther imide Polymères ramifiés Résistance à la traction Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Microgels are novel functional polymers with an intramolecular crosslinked structure that can significantly improve the mechanical properties of coatings. We demonstrate herein for the first time successful fabrication of microgels based on branched poly(ethylenimine) (PEI) and their incorporation into water-soluble polyacrylate (WPA), with subsequent preparation of compact coatings via electrophoretic deposition (EPD) and ultraviolet (UV) radiation. The films including the microgels exhibited tensile strength and elongation at breakage values above 6.82 MPa and 72.09%, respectively. The coatings showed good thermal stability, decreased water absorption, outstanding durability, and rust resistance after immersion in 5 wt% NaCl solution for 7 days at 40°C. This work provides a new strategy that can be readily applied to a variety of conductive substrates. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of acrylate prepolymer - Synthesis of microgels with hyperbranched structure - Preparation of UV-curable EPD coatings - Characterization - RESULTS AND DISCUSSION : FTIR and 1H NMR analyses of PIK monomer - Particle size control of WPA-PIK emulsions - Thermal stability of waterborne UV-curable EPD coatings - Mechanical properties and water resistance - Other physical properties of UV-curable EPD coatings DOI : 10.1007/s11998-019-00219-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00219-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33017 [article]

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The influence of hydrophobic protection on building exterior claddings / Carlos Esteves in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1379-1388 Titre : The influence of hydrophobic protection on building exterior claddings Type de document : texte imprimé Auteurs : Carlos Esteves, Auteur ; Hawreen Ahmed, Auteur ; Inês Flores-Colen, Auteur ; Rosario Veiga, Auteur Année de publication : 2019 Article en page(s) : p. 1379-1388 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Applications extérieures Capillarité Composites Essais (technologie) Humidité -- Absorption:Eau -- Absorption Hydrophobie Isolation thermique Mortier Oligomères Perméabilité Pierre Revêtement mural Revêtements en bâtiment Séchage 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 presents the results of an experimental campaign with the aim of investigating the hydrophobic protection of three substrates (stone, render, and external thermal insulation composite system—ETICS) with the application of three hydrophobic products: silicon and titanium dioxides-based nanostructured dispersion (HNST); a silane/oligomeric siloxane (HSila/Silox); and a siloxane (HSilox). To determine the effectiveness of the hydrophobic treatments, specimens of the untreated and treated wall coatings were characterized with different laboratory tests. The results showed that all products introduced significant improvements in the hydric properties of the substrates, leading to lower capillary water absorption (98%), water permeability with Karsten pipes (99%), drying index (39%), and higher water repellency assessed through the contact angle (283%). The application of hydrophobic materials also had a negative effect, leading to up to a 227% increase in resistance to water vapor diffusion. Among the assessed wall coatings, the rendering mortar appears to have the best initial performance after the application of all the types of hydrophobic materials tested. In general, the hydrophobic product HSilox was proved to be the most suitable for rendering mortars, while HNST was more appropriate for stone substrates. Note de contenu : - EXPERIMENTAL CAMPAIGN : Materials - Methodology - RESULTS AND DISCUSSION : Capillary water absorption and water absorption by Karsten pipes - Drying test - Water vapor permeability - Contact angle - Biological colonization - Optimization DOI : 10.1007/s11998-019-00220-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00220-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33018 [article]

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Effect of aluminum hydroxide on the fireproofing properties of ammonium polyphosphate–pentaerythritol-based intumescent coating / Yu M. Evtushenko in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1389-1398 Titre : Effect of aluminum hydroxide on the fireproofing properties of ammonium polyphosphate–pentaerythritol-based intumescent coating Type de document : texte imprimé Auteurs : Yu M. Evtushenko, Auteur ; Yu A. Grigoriev, Auteur ; T. A. Rudakova, Auteur ; A. N. Ozerin, Auteur Année de publication : 2019 Article en page(s) : p. 1389-1398 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Hydroxyde d'aluminium Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Pentaérythritol Le pentaérythritol est un composé organique de formule semi-développée C(CH2OH)4. Ce polyol blanc et cristallin avec un squelette néopentane est une brique polyvalente pour la préparation de nombreux composés multifonctionnalisés comme l'explosif PETN ou le tétraacrylate de pentaérythritol. Les dérivés du pentaérythritol sont des composants des résines glycéro, tackifiantes, des vernis, des stabilisateurs du PVC, des esters de tallöl (en) et des antioxydants d'oléfines. Synthèse : Le pentaérythritol peut être préparé par condensation d' acétaldéhyde et de formaldéhyde en milieu basique. Le processus inclut des aldolisations successives suivie d'une réaction de Cannizzaro. Les impuretés produites sont le dipentaérythritol et le tripentaérythritol : 2 CH3CHO + 8 CH2O + Ca(OH)2 → 2 C(CH2OH)4 + (HCOO)2Ca Polyphosphate d'ammonium Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : A fireproof composition based on ammonium polyphosphate and pentaerythritol with a number of functional additives was developed and studied. The additives are able to form a protective char during fire exposure below the thermal decomposition temperature of the polymer composites. The decrease in the char formation temperature of the fire-protective coating provides a molar excess of ammonium polyphosphate with respect to the mole fractions of pentaerythritol and aluminum hydroxide. Introducing the latter in the composition of the flame-retardant coating also contributes to the decrease in the char formation temperature. The fire-protection coating can be used to protect various combustible materials, e.g., wood, laminates, plastics, etc. DOI : 10.1007/s11998-019-00221-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00221-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33019 [article]

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Strong and sustainable chemical bonding of TiO2 on nylon surface using 3-mercaptopropyltrimethoxysilane (3-MPTMS): analysis of antimicrobial and decomposition characteristics of contaminants / Gyoyoung Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1399-1409 Titre : Strong and sustainable chemical bonding of TiO2 on nylon surface using 3-mercaptopropyltrimethoxysilane (3-MPTMS): analysis of antimicrobial and decomposition characteristics of contaminants Type de document : texte imprimé Auteurs : Gyoyoung Lee, Auteur ; Jaewoong Lee, Auteur ; Chankyu Kang, Auteur Année de publication : 2019 Article en page(s) : p. 1399-1409 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 3-mercaptopropyltriméthoxysilane Antimicrobiens Dioxyde de titane Fibres textiles synthétiques Liaisons chimiques Photodétérioration Polyamide 66 Textiles et tissus synthétiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the antimicrobial and photodegradation properties of nylon fabric were improved by chemical treatment using 3-mercaptopropyltrimethoxysilane (3-MPTMS), which binds to photocatalyst TiO2, on a nylon fabric surface. The nylon fibers were impregnated with a solution containing isopropanol, titanium dioxide (TiO2), and 3-MPTMS at optimum ratios, and then stirred for 90 min. To remove the nonreactive impurities, the sample was washed twice with isopropanol and distilled water, and then dried. The TiO2 concentration, agitation temperature, and time were varied to determine suitable coating conditions for attachment to the nylon surface; the resulting properties were confirmed by scanning electron microscopy/energy dispersive spectroscopy. To evaluate the antimicrobial and photodegradation properties of TiO2, antimicrobial tests were conducted using the microbial reduction method and contact angle tests. The fiber contamination rate was measured by computer color matching after the sample was contaminated with methylene blue. Moreover, the antimicrobial activity of Staphylococcus aureus and Escherichia coli strains on the treated nylon was investigated. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Material - Agitationof 3-MPTMS and TiO2 colloid sol - Pad-dry-cure method for TiO2 colloid sol - Scanning electron microscopy/energy dispersive spectroscopy - X-ray photoelectron spectroscopy - Atomic force microscopy - Contact angle analysis - Thermal analysis by thermogravimetry/differential thermal analysis - Transmission electron microscopy - Washing fastness - Antimicrobial analysis - Pollution degradability - Thermal stability of fabrics antimicrobial and photocatalytic properties DOI : 10.1007/s11998-019-00222-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00222-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33020 [article]

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A promising ternary nanohybrid of Copper@Zinc oxide intercalated with polyaniline for simultaneous antistatic and antibacterial applications / Abdolreza Mirmohseni in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1411-1422 Titre : A promising ternary nanohybrid of Copper@Zinc oxide intercalated with polyaniline for simultaneous antistatic and antibacterial applications Type de document : texte imprimé Auteurs : Abdolreza Mirmohseni, Auteur ; Maryam Azizi, Auteur ; Mir Saeed Seyed Dorraji, Auteur Année de publication : 2019 Article en page(s) : p. 1411-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Antistatiques Cuivre Essais d'adhésion Matériaux hybrides Oxyde de zinc Polymères en émulsion Polyuréthanes Résistance à l'abrasion Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a facile and cost-effective approach has been developed for fabricating antibacterial and antistatic waterborne polyurethane (WPU)-based coatings by using Polyaniline-Copper@Zinc oxide (P-Cu@ZnO) ternary nanohybrid as a multifunctional additive. The solid-state reaction of copper acetate and zinc acetate salts led to the synthesis of copper clusters on the ZnO nanoparticles (Cu@ZnO). The obtained Cu@ZnO nanoparticles were intercalated with polyaniline (PANI) chains to prepare the P-Cu@ZnO nanohybrid. FTIR, XRD, UV–Vis, and FESEM analyses were used to characterize the structural, crystallographic, and morphological properties of the synthesized nanohybrid. Adding P-Cu@ZnO nanohybrid to the WPU matrix not only improved adhesion strength of the coatings but also enhanced their scratch resistance compared to the pristine WPU coating. Moreover, incorporation of the obtained nanohybrid into the WPU coatings caused electrical surface resistance of the obtained coatings to reach 1.2 × 10+8 Ω/sq, so, these coatings gained the optimum electrical surface resistance to be counted as an antistatic coating. Also, the results of the colony counting test showed that the modified coatings could reduce the Staphylococcus aureus and Escherichia coli bacteria growth by about 86% and 74%, respectively. Note de contenu : - EXPERIMENTAL : Materials - Prepration of copper decorated zinc oxide (Cu@ZnO) - Synthesis of pure polyaniline (PANI) and polyaniline-copper@zinc oxyde ternary nanohybrid (P-CU@ZnO) - Preparation of waterborne polyurethane dispersion (WPUs) - Preparation of modified waterborne polyurethane coatings - Characterization of polyaniline-copper@Zinc oxide ternary nanohybrid - Confirmation of the presence of Cu clusters in Cu@ZnO nanoparticles by UV-vis study - The proposed mechanism for the formation of copper clusters on the zinc oxide - Evaluation of the coatings' adhesion strength and scratch resistance - Antistatic behavior of waterborne polyurethane based coatings - Investigating antibacterial activity of the waterborne polyurethane coatings DOI : 10.1007/s11998-019-00223-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00223-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33021 [article]

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Effect of operating parameters on the structural growth of ZnAl layered double hydroxide on AA6082 and corresponding corrosion resistance properties / Muhammad Ahsan Iqbal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1423-1433 Titre : Effect of operating parameters on the structural growth of ZnAl layered double hydroxide on AA6082 and corresponding corrosion resistance properties Type de document : texte imprimé Auteurs : Muhammad Ahsan Iqbal, Auteur ; Michele Fedel, Auteur Année de publication : 2019 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages Anticorrosifs Anticorrosion Composés organiques -- Synthèse Hydroxydes doubles lamellaires Morphologie (matériaux) Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a series of ZnAl layered double hydroxide (ZnAl-LDH) thin films were synthesized on an AA6082 alloy by a single-step hydrothermal process at different synthesis parameters, including reaction temperature, reaction time, pH, and the relation between the LDH structural variations, and the corresponding corrosion resistance properties are briefly reported. The as-prepared synthetic coatings were characterized by scanning electron microscopy and X-ray diffraction. The corresponding corrosion properties were evaluated through potentiodynamic polarization curves and through electrochemical impedance spectra. The findings demonstrated that synthesis parameter variations impart an influential effect on the geometry of LDH, film thickness, and structural morphologies which have a significant impact on LDH corrosion resistance properties. The ZnAl-LDH corrosion resistance was found to increase with respect to extended high temperature and aging time, while the synthetic pH conditions also promoted LDH growth and film thickness, relative to lower-pH reaction conditions. The optimization results are attributed to high ZnAl-LDH corrosion resistance and act as a strong barrier film and ion-exchange surface area. The ZnAl-LDH films at 80°C-18r-6.5pH have shown much lower corrosion current density compared to bare AA6082, and a decrease of up to five orders of magnitude is observed. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ZnAl layered double hydroxide film - CHARACTERIZATION En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00227-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33022 [article]

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Effect of particle shape on the wear and friction behavior of particle-reinforced epoxy coatings / Kenan Cinar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1435-1445 Titre : Effect of particle shape on the wear and friction behavior of particle-reinforced epoxy coatings Type de document : texte imprimé Auteurs : Kenan Cinar, Auteur ; S. Ozmen Eruslu, Auteur ; I. Savas Dalmis, Auteur ; Ibrahim Guven, Auteur Année de publication : 2019 Article en page(s) : p. 1435-1445 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Epoxydes Formes des particules Frottements (mécanique) Particules (matières) Polymères -- Détérioration Revêtements organiques Tomographie à rayons X Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy coatings are increasingly becoming popular choices as barriers against acids and alkali for protection of concrete and metal products. In applications, metal containers are often coated with epoxy-based coatings to prevent rusting and corrosion. In this study, an experimental examination was carried out to investigate the effect of particle shape and size on the friction and wear behavior of epoxy coatings. Friction and wear experiments were conducted using a pin-on-disk tribometer. Epoxy resin was filled with four different shapes of glass particles (spherical, flake, rod, and irregular shape) and varying particle sizes. Fillers were settled down and filler surface area fraction through thickness was characterized using microcomputed tomography (micro-CT). The wear mechanisms such as matrix wear, matrix cracking, particle fracture, particle debonding, and pullout and debris formation were studied using scanning electron microscopy. According to observations, it was found that particle shape has an effect on the wear characteristic. Particle fracture and particle pullout mainly dominated the wear in the samples of flake- and rod-shaped fillers, perpendicular matrix cracks occurred in the samples of spherical fillers, large debonding at the particle–matrix interface without particle pullout occurred in the samples of large irregular-shaped fillers (75–150 µm), and matrix cracks dominated the wear as the size of irregular-shaped fillers decreased to 50–75 µm. Further, it was found that friction coefficient depends on the shape of the particle. The samples with spherical- and irregular-shaped fillers had higher friction coefficient as compared to the samples with flake and rod fillers. Note de contenu : - MATERIALS AND EXPERIMENTAL PROCEDURES : Materials and manufacturing - Microcomputed tomography imaging - Wear and friction tests - RESULTS AND DISCUSSION : Coefficient of friction - Weight loss - Wear mechanisms and morphology of the worn surfaces DOI : 10.1007/s11998-019-00228-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00228-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33023 [article]

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Environmentally friendly Zn–Al layered double hydroxide (LDH)-based sol–gel corrosion protection coatings on AA 2024-T3 / R. Subasri in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1447-1463 Titre : Environmentally friendly Zn–Al layered double hydroxide (LDH)-based sol–gel corrosion protection coatings on AA 2024-T3 Type de document : texte imprimé Auteurs : R. Subasri, Auteur ; K. R. C. Soma Raju, Auteur ; D. S. Reddy, Auteur ; A. Jyothirmayi, Auteur ; Vijaykumar S. Ijeri, Auteur ; Om Prakash, Auteur ; Stephen P. Gaydos, Auteur Année de publication : 2019 Article en page(s) : p. 1447-1463 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse électrochimique Anticorrosifs Anticorrosion Caractérisation Chrome hexavalent Essais d'adhésion Essais de brouillard salin Hydroxydes doubles lamellaires Inhibiteurs (chimie) Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Zn–Al layered double hydroxide (LDH) intercalated with various corrosion inhibitors namely vanadate (E1), 2-mercapto benzothiazole (E3), molybdate (E7), phytic acid (E8) and 8-hydroxyquinoline (E9) was dispersed in a hybrid sol–gel silica matrix sol. Bilayer coatings with configurations E3|E1, E7|E1, E8|E1 and E9|E1 were generated on aluminum alloy AA 2024-T3 substrates using the inhibitor intercalated LDH modified sols by dip coating technique followed by UV curing and thermal curing at 80°C for 1 h in air. Corrosion resistance of coatings deposited from matrix sol with and without inhibitor intercalated LDH was studied by electrochemical impedance spectroscopy, potentiodynamic polarization after exposure to 3.5% NaCl and salt spray tests, results of which were compared with those of uncoated and chromated substrates. A non-chromated primer was applied on the sol–gel coated substrates. Adhesion of the coatings to the substrate and to the primer was evaluated by peel-off tape test and found to be rank 5. The sol–gel coated substrates did not exhibit corrosion during salt spray tests. Electrochemical tests showed that all the sol–gel coated substrates exhibited superior corrosion resistance when compared to bare and chromated substrates. More specifically, coatings generated using the corrosion inhibitors phytic acid and 8-hydroxy quinoline intercalated Zn–Al LDH were seen to render maximum corrosion protection, exhibiting two orders of magnitude lower corrosion currents than bare substrates and one order lower corrosion current than chromated substrate, after 120-h exposure to 3.5% NaCl solution. Note de contenu : - EXPERIMENTAL : Materials - LDH and sol synthesis - Substrate cleaning, coating deposition and curing - Characterization - RESULTS AND DISCUSSION : Phase purity and morphology of as-synthesized Zn-Al LDH and intercalated Zn-Al LDH powders - Microstructure of coated substrates - Salt spray tests - Potentiodynamic polarization and electrochemical impedance spectroscopy studies - Adhesion strength DOI : 10.1007/s11998-019-00229-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00229-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33024 [article]

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Practical adhesion measurements of protective coatings on bronze by three-point bending test / Maëlenn Aufray in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1465-1477 Titre : Practical adhesion measurements of protective coatings on bronze by three-point bending test Type de document : texte imprimé Auteurs : Maëlenn Aufray, Auteur ; Claudie Josse, Auteur ; Andrea Balbo, Auteur ; Cecilia Monticelli, Auteur ; Erika Svara Fabjan, Auteur ; Luka Skrlep, Auteur ; Tadeja Kosec, Auteur ; Nina Gartner, Auteur ; Carla Martini, Auteur ; Giulia Masi, Auteur ; Cristina Chiavari, Auteur ; Elena Bernardi, Auteur ; Maria Chiara Bignozzi, Auteur ; Luc Robbiola, Auteur ; Marija Babnik, Auteur ; Teja Korsic, Auteur ; Marko Kete, Auteur Année de publication : 2019 Article en page(s) : p. 1465-1477 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Bronze Essais dynamiques Evaluation Flexion trois points Métaux -- Revêtements protecteurs Objets d'art -- Conservation et restauration Patine Revêtements -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : When attempting to sufficiently protect outdoor bronze monuments from corrosion, searches for an effective solution are usually based on coating applications which have a high anticorrosive efficiency. In order to correctly assess the level of protection provided by such coatings, adherence (practical adhesion) measurements need to be performed for the proper evaluation of the deterioration of coating systems with aging. Although a coupled study of adherence with aging would be of great interest, very few such studies are available. In this work, a methodological approach is proposed for the evaluation of coatings applied to metallic cultural heritage monuments of, based on the use of a three-point bending test. Adherence characterization of different protective coatings has been performed both on bare and on traditionally black-patinated bronze coupons (Cu–Sn alloy with 5.9 wt% Sn), which were used as basic model substrates. The investigated coatings were Incralac®, silane, sol–gel oxysilane, and a silane-modified polymethacrylate (an adhesion promoter for fluoropolymer). The results of measurements which were obtained before and after accelerated aging in concentrated acid rain made it possible to more easily differentiate between the various adherence levels of different coating systems. Coupled with adherence measurements, the results of systematic optical and SEM observation of the different failure morphologies are also presented. In the case of the coated bare alloy, adhesive failures were mainly observed. The silane (PropS-SH) coating showed the best adherence. In the case of the patinated bronze test specimens, only cohesive failures occurred. Adherence is directly related to the cohesion of the black patina rather than that of the applied coating. It was observed that aging reduces the level of the adherence. Note de contenu : - EXPERIMENTAL : Materials - The aging method - Practical adhesion measurements - Adhesive failure observation and surface characterization - RESULTS AND DISCUSSION : Coated bare bronze (B) - Coated patinated bronze (P) DOI : 10.1007/s11998-019-00230-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00230-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33025 [article]

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UV-curable waterborne polyurethane dispersions modified with a trimethoxysilane end-capping agent and edge-hydroxylated boron nitride / Huixiang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1479-1492 Titre : UV-curable waterborne polyurethane dispersions modified with a trimethoxysilane end-capping agent and edge-hydroxylated boron nitride Type de document : texte imprimé Auteurs : Huixiang Liu, Auteur ; Hong Zhang, Auteur ; Chaohua Peng, Auteur ; Shufan Ren, Auteur ; Conghui Yuan, Auteur ; Weiang Luo, Auteur ; Guorong Chen, Auteur ; Fuqiang He, Auteur ; Lizong Dai, Auteur Année de publication : 2019 Article en page(s) : p. 1479-1492 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Caractérisation Nitrure de bore Le nitrure de bore est un composé chimique du bore et de l'azote, de formule chimique brute BN (nombre égal d'atomes de chaque élément). Le nitrure de bore est isoélectronique avec le carbone et, comme ce dernier, existe sous plusieurs formes polymorphiques, dont l'une est analogue au diamant et l'autre au graphite. La forme diamant est l'un des matériaux les plus durs connus et la forme graphite est un lubrifiant apprécié. De plus, ces deux polymorphes possèdent des propriétés d'absorption radar. Polymères à terminaison silane Polymères en émulsion Polyuréthanes Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Surfaces -- Analyse Triméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, waterborne polyurethane (WPU) dispersions were prepared using a trimethoxysilane end-capping agent (DAA-GPTMS) derived from diallylamine (DAA), (3-glycidoxypropyl)methyldiethoxysilane (GPTMS) and modified with edge-hydroxylated boron nitride (hBN-OH) nanosheets. The WPU films containing DAA-GPTMS possessed remarkable hydrophobicity and favorable water repellency, attaining a contact angle of 101.2° and a 52% decrease in water absorption relative to those of the pure WPU. When the contents of DAA-GPTMS and hBN-OH were 7.5 wt% and 0.2 wt%, respectively, the synergetic effect between the DAA-GPTMS and the hBN-OH nanosheets greatly enhanced the physical and mechanical properties of the nanocomposite films, i.e., the stress doubled and the Young’s modulus increased by fivefold compared to those of pure WPU. Embedding 0.2 wt% of the hBN-OH nanosheets in the WPU coatings resulted in a lower corrosion current density (1.0 × 10−10 A cm−2) and more positive corrosion potential (− 0.63 V). The results demonstrate that WPU/hBN-OH nanocomposite coatings possess great potential for corrosion protection. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and chemicals - Synthesis of a triethoxysilane end-capping agent (DAA-GPTMS) - Synthesis of hydroxylated hexagonal boron nitride (hBN-OH) - Synthesis of WPU and WPU/hBN-OH nanocomposites - Preparation of the WPU and hBN-OH/WPU nanocomposite films - Characterization - RESULTS : Structural characterization - DLS analysis of WPU and WPU/hBH-OH nanocomposite dispersions - Hydrophobicity and water resistance of WPU and WPU/hBN-OH nanocomposite films - Crosslinking degree of the WPU and WPU/hBN-OH nanocomposite films - Mechanical and physical properties of the WPU and WPU/hBN-OH nanocomposite films - Morphology analysis of the fracture surfaces - Anticorrosion performance DOI : 10.1007/s11998-019-00232-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00232-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33026 [article]

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Phosphorus-containing reactive agent for UV-curable flame-retardant wood coating / Saket Mulge in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1493-1502 Titre : Phosphorus-containing reactive agent for UV-curable flame-retardant wood coating Type de document : texte imprimé Auteurs : Saket Mulge, Auteur ; Siddhesh Mestry, Auteur ; Durva Naik, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2019 Article en page(s) : p. 1493-1502 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Caractérisation Dichlorure de phénylphosphonique Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Réactions chimiques Résonance magnétique nucléaire Réticulants Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : An attempt to develop a phosphorus-based flame-retardant UV-curable agent (UV-RA) for coating application led to the synthesis of a reactive compound which can be used as crosslinker along with UV-curable epoxy acrylate oligomer to form a coating. UV-RA was characterized via FTIR, NMR, hydroxyl, and iodine values. Study based on the effects of varying amount of UV-RA incorporated in the formulation was investigated by checking thermal, mechanical, and flame-retardant properties. An enhancement in all the properties was observed with an increase in concentration of UV-RA and each coating containing UV-RA successfully portrayed flame-retardant properties. The highest loss on ignition (LOI) value obtained was 27 while the initial and final degradation temperatures increased along with the char yield. The mechanical properties did not vary much except for the low values for 20UV-RA. Note de contenu : - MATERIALS AND METHODS : Materials - Reaction of ethanolamine and PPDC - Reaction of I-1 with GMA - Preparation of UV-curable wood coatings - Characterization - Instrumentation - RESULTS AND DISCUSSION : NMR analysis - Coating properties DOI : 10.1007/s11998-019-00224-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00224-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33027 [article]

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Effect of practical parameters on the structure and corrosion behavior of vanadium/zirconium conversion coating on AA 2024 aluminum alloy / P. Ahmadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1503-1513 Titre : Effect of practical parameters on the structure and corrosion behavior of vanadium/zirconium conversion coating on AA 2024 aluminum alloy Type de document : texte imprimé Auteurs : P. Ahmadi, Auteur ; A. A. Sarabi, Auteur ; H. Eivaz Mohammadloo, Auteur ; H. Behgam, Auteur Année de publication : 2019 Article en page(s) : p. 1503-1513 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages 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. Anticorrosifs Anticorrosion Caractérisation Electrochimie Métaux -- Revêtements protecteurs Microscopie à force atomique Polarisation (électricité) Revêtement de conversion Spectroscopie d'impédance électrochimique Vanadium Le vanadium est un élément chimique, de symbole V et de numéro atomique 23. C'est un métal rare, dur et ductile que l'on trouve dans certains minerais. Il est principalement utilisé dans les alliages. Il possède une bonne résistance à la corrosion par les composés alcalins, ainsi qu'aux acides chlorhydrique et sulfurique. Il s'oxyde rapidement à environ 933 K. Le vanadium possède une bonne force structurelle ainsi qu'une faible section efficace d'interaction avec les neutrons de fission, ce qui le rend utile dans les applications nucléaires. C'est un métal qui présente à la fois des caractéristiques acide et basique. Zirconium Index. décimale : 667.9 Revêtements et enduits Résumé : In this research corrosion behavior of the hexafluorozirconic acid-based conversion coating (ZrCC) applied on the surface of AA2024 aluminum alloy, in the absence and presence of sodium metavanadate (ZrVCC), has been investigated. At the first step, practical parameters of ZrCC conversion coating were optimized using data of polarization resistance (Rp) and corrosion current density (icorr) obtained from electrochemical impedance spectroscopy and polarization techniques, respectively. In the next step the effect of sodium metavanadate presence by assessment on the effect of parameters including concentration of sodium metavanadate, immersion time, and solution pH on surface and electrochemical properties was investigated. The optimized practical conditions for ZrCC were immersion time of 60 s in 0.01 M of H2ZrF6 solution at room temperature and solution pH = 2. For the ZrVCC sample, the best results appeared for the immersion time of 60 s in the bath containing 1 g/lit sodium metavanadate at room temperature and pH = 2. Corrosion current density value of the ZrVCC sample was 0.07 µA/cm2 which seems to be 10 times smaller than its amount for the uncoated sample. Film formation of conversion coatings was investigated by field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM). FE-SEM and EDS test results revealed that zirconium compounds mostly precipitated on the surface of intermetallic particles. Note de contenu : - EXPERIMENTAL : Specimen preparation - Surface examination - Electrochemical experiments - RESULTS AND DISCUSSION : Contact angle measurement - Zirconium conversion coating characterization - Effect of NaVO3 on anticorrosion performance - Surface study DOI : 10.1007/s11998-019-00215-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00215-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33028 [article]

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