Chemical and anticorrosion characterization of polysilsesquioxane coatings catalyzed by different acids / Wentao Xing in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 1 (03/2008)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 1 (03/2008) . - p. 65-72 Titre : Chemical and anticorrosion characterization of polysilsesquioxane coatings catalyzed by different acids Type de document : texte imprimé Auteurs : Wentao Xing, Auteur ; Bo You, Auteur ; Limin Wu, Auteur Année de publication : 2008 Article en page(s) : p. 65-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides Anticorrosifs Anticorrosion Polymères -- Synthèse Polysilsesquioxane Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The polysilsesquioxane coatings were synthesized via the sol-gel reaction of methyltriethoxysilane (MTES), 3-glycidoxypropyltrimethoxysilane (GPMS), and tetraethoxysilane (TEOS) using different kinds of acid such as phytic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, tannic acid, and hydrochloric acid as the catalysts, and investigated by 13C NMR, 29Si NMR, SEM, electrochemical techniques, and salt-spray test, respectively. It was found that four different acid-catalyzed polysilsesquioxanes were mainly composed of T2 and T structure, but different acids caused some differences in reaction mechanism and the relative ratio of T2 to T3 structure. The catalysis of phytic acid caused more complete polysilsesquioxanes, which had much better corrosion resistant performance than the other three acids-catalyzed polysilsesquioxanes. DOI : 10.1007/s11998-007-9076-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9076-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3615 [article]

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Dependence of dirt resistance of steel topcoats on their surface characteristics / Sainan Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 3 (05/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 3 (05/2013) Titre : Dependence of dirt resistance of steel topcoats on their surface characteristics Type de document : texte imprimé Auteurs : Sainan Li, Auteur ; Guangxin Gu, Auteur ; Shuxue Zhou, Auteur ; Limin Wu, Auteur Année de publication : 2013 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. Angle de contact Hydrophilie Mouillabilité Polyfluorure de vinylidène Résistance à la salissure Revêtement auto-nettoyant:Peinture auto-nettoyante Revêtements -- Finition:Peinture -- Finition Index. décimale : 667.9 Revêtements et enduits Résumé : Contamination of exterior coatings with dirt is a significant problem in seriously polluted environments. To correlate the dirt resistance of exterior coatings with surface characteristics (wettability, roughness, and composition), steel topcoats were evaluated using both dirt pick-up tests according to a national standard testing method of China (GB/T 9757-2001) and outdoor exposure experiments in Shanghai, China. These topcoats included polyvinylidene fluoride (PVDF) paints with various water contact angles (WCAs), polyurethane (PU) paint, polysiloxane (PSiO) paint, and 2K fluorocarbon (FPU) paint. Opposite dirt resistance results were obtained from these two dirt pick-up methods. In the outdoor exposure experiments, superhydrophilic PVDF paints showed excellent self-cleaning performance and thus superior dirt resistance. Superhydrophobic PVDF paint exhibited self-cleaning performance initially, but became dirty finally due to a piling up of PM2.5 pollutants. PVDF paints with WCAs of 85°–125°, PU, PSiO, and FPU paints all exhibited poor dirt resistance in the outdoor environment. These results indicate that dirt resistance depends on surface wettability and the characteristics of pollutants rather than on the surface roughness and composition. Note de contenu : - EXPERIMENTAL : Preparation of coating panels - Dirt pick-up test in lab - outdoor exposure experiments - Characterization - RESULTS AND DISCUSSION : The surface characteristics of steel topcoats - Dirt resistance test - Outdoor exposure experiment - Effect of surface wettability - Effect of the type of steel topcoats DOI : 10.1007/s11998-012-9462-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9462-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18733 [article]

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Extended hydrophobicity and self-cleaning performance of waterborne PDMS/TiO2 nanocomposite coatings under accelerated laboratory and outdoor exposure testing / Fei Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1025-1034 Titre : Extended hydrophobicity and self-cleaning performance of waterborne PDMS/TiO2 nanocomposite coatings under accelerated laboratory and outdoor exposure testing Type de document : texte imprimé Auteurs : Fei Xu, Auteur ; Tao Wang, Auteur ; James Bohling ; Alvin M. Maurice ; Hong Yu Chen ; Limin Wu ; Shuxue Zhou Année de publication : 2018 Article en page(s) : p. 1025-1034 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures Dioxyde de titane Essais accélérés (technologie) Hydrophobie Nanoparticules Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Revêtement auto-nettoyant Index. décimale : 667.9 Revêtements et enduits Résumé : It has been shown that incorporation of TiO2 nanoparticles into hydrophobic coatings can show self-cleaning performance. Accelerated laboratory testing indicated that the coats retain their hydrophobic nature for an extended time period. In this paper, hydrophobic polydimethylsiloxane (PDMS)/TiO2 nanocomposite coatings with a TiO2 content of 0–40% were fabricated by simple blending of a PDMS dispersion with an aqueous TiO2 nanoparticle dispersion. Their long-term hydrophobicity and self-cleaning performance were investigated both in laboratory and real-world outdoor testing. As expected, TiO2 nanoparticle-based coatings exhibited better self-cleaning relative to the TiO2-free PDMS control coating as measured by methylene blue degradation testing. Excellent long-term hydrophobicity was observed in accelerated weathering testing when they contained the appropriate levels of TiO2 nanoparticles (i.e., 0–30%). However, the same PDMS/TiO2 coatings did not show self-cleaning performance, and instead, exhibited improved dirt pickup resistance, in outdoor exposure testing. Sustained hydrophobicity was observed in outdoor exposure testing for the clear films except when TiO2 levels were at 40%. The hysteresis of water contact angle (HWCA) significantly increased for the PDMS control coating, and water beading was lost as the film surface picked up dirt. In contrast, the TiO2-based coatings with appropriate TiO2 levels maintained a relatively low HWCA after outdoor exposure and no water sheeting on rainy days was observed. This result demonstrates that while photocatalytic TiO2 nanoparticles can maintain coating hydrophobicity upon outdoor exposure, long-term self-cleaning performance in polluted environments has not yet been achieved with this type of coating under real-world conditions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of TiO2 nanoparticle dispersion - Preparation of hydrophobic PDMS/TiO2 nanocomposite coatings - Characterization - RESULTS AND DISCUSSION : Preparation of the hydrophobic PDMS/TiO2 coatings - Performances of TiO2-based hydrophobic coatings in laboratory - Performances of TiO2-based hydrophobic coatings outdoors DOI : 10.1007/s11998-017-0037-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0037-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31126 [article]

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Facile fabrication of superhydrophobic polysiloxane/magnetite nanocomposite coatings with electromagnetic shielding property / Xiaofeng Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 6 (11/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 6 (11/2011) . - p. 757-764 Titre : Facile fabrication of superhydrophobic polysiloxane/magnetite nanocomposite coatings with electromagnetic shielding property Type de document : texte imprimé Auteurs : Xiaofeng Ding, Auteur ; Shuxue Zhou, Auteur ; Guangxin Gu, Auteur ; Limin Wu, Auteur Année de publication : 2011 Article en page(s) : p. 757-764 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Blindage (électricité) Champs magnétiques Hydrophobie Magnétite Matériaux hybrides Nanoparticules Revêtements:Peinture 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 : Superhydrophobic coatings, with a water contact angle (WCA) of 158.3° and a sliding angle of 4.3°, were readily prepared by mixing silicone resin, aminopropyltriethoxysilane and Fe3O4 nanoparticles, and subsequently curing at an ambient temperature. The surface wettability, surface morphology and composition, and long-term durability of the coatings were investigated by WCA analysis, field emission scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and QUV accelerated weathering tests, respectively. The results show that the coatings display a pencil hardness of B, excellent weatherability, and electromagnetic shielding effectiveness beyond 60% in the frequency range of 10–3000 MHz. Note de contenu : - EXPERIMENTAL : Materials - Preparation of polysiloxane/Fe3PO4 nanocomposite coatings - Characterization - RESULTS : Preparation of polysiloxane/Fe3PO4 nanocomposite coatings - Surface wettability - Surface topography - Macro hardness - Weatherability - Electromagnetic interference shielding properties DOI : 10.1007/s11998-011-9358-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9358-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12602 [article]

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A novel adsorption method to simulate the dirt pickup performance of organic coatings / Shuxue Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 175-184 Titre : A novel adsorption method to simulate the dirt pickup performance of organic coatings Type de document : texte imprimé Auteurs : Shuxue Zhou, Auteur ; Yang Yang, Auteur ; Tao Wang, Auteur ; Hongyu Chen, Auteur ; James Bohling, Auteur ; Alvin M. Maurice, Auteur ; Limin Wu, Auteur Année de publication : 2018 Article en page(s) : p. 175-184 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Cendres Cendres de riz et constituants Essais (technologie) Méthyltriméthoxysilane Résistance à la salissure Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The evaluation of the dirt resistance of organic coatings according to traditional accelerated methods (e.g., the standard method GB/T 9780-2013 in China) usually provides results which deviate from their real-world performance in seriously polluted environments. As an alternative, a novel adsorption method with methyltrimethoxysilane-modified rice-straw ash as the artificial dirt standard was proposed in this paper. With this method, the ash was dispersed into the air in a testing chamber and then allowed to physically adsorb to the coating, which is believed to more accurately simulate the adsorption behavior of floating particulates outdoors. Two groups of latex coatings from Dow Chemical Company were employed to evaluate the adsorption method by monitoring the changes in color, whiteness, and reflectivity. In parallel, outdoor exposure testing of these coatings was conducted. The influences of charging method, of ash type, and panel position on the testing results were carefully investigated. Multicharging of ash (9 g × 3) and parallel panels at different positions in the testing chamber are designed for the generation of repeatable results. It was demonstrated that the adsorption method basically matched the outdoor exposure results and was more predictive of real-world results than GB/T 9780-2013. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of standard dirt - Testing apparatus and method - Outdoor exposure testing - Characterization - RESULTS AND DISCUSSION : Preparation of standard dirt - Influence of the type of dirt - Influence of charging method of ash - Influence of testing panel position - Examination of the repeatibility of adsorption method - The feasibility of adsorption method DOI : 10.1007/s11998-017-9971-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9971-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30110 [article]

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Preparation and surface properties of silicone-modified polyester-based polyurethane coats / Jun Yang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 4 (10/2006)  

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