Influences of maleic reactive surfactants with different EO chain lengths on the properties of the acrylate latices / Jianhong Yang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1041-1052 Titre : Influences of maleic reactive surfactants with different EO chain lengths on the properties of the acrylate latices Type de document : texte imprimé Auteurs : Jianhong Yang, Auteur ; Yanhong Zhu, Auteur ; Jianfeng Zhu, Auteur ; Wanghui Liu, Auteur ; Ming Zhou, Auteur ; Lingmin Zhi, Auteur ; Dinglong Li, Auteur ; Qin Shen, Auteur Année de publication : 2015 Article en page(s) : p. 1041-1052 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Anhydride maléique Groupe oxyéthylène Latex Polymérisation en émulsion Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : Three maleic reactive surfactants with different oxyethylene (EO) units (5, 9 and 15) were synthesized and used to prepare the soap-free acrylate latices with methyl methacrylate, butyl acrylate, and hydroxypropyl acrylate as monomers through the polymerization of pre-emulsifying seed emulsion and semi-continuous dropping process. Effects of EO chain lengths on the properties of the latices and their films were investigated. The results showed the polymerization using maleic reactive surfactant with 9 EO units could achieve the highest monomer conversion and the copolymers with highest M w were obtained. The viscosity of latices decreased and their chemical stabilities and particle sizes increased with the increase of EO chain lengths. The EO chain lengths slightly influenced the pencil hardness and adhesion of the latex films, but the shorter the EO chain lengths were, the better were these properties. The amount of maleic reactive surfactants had effects on the properties of the acrylate latices as well. In addition, the results from TEM showed that the latex particles were irregular and there were some “caves” in the particles. It was considered that the particles were formed due to the coil and entanglement of the growing polymer chains in the aqueous phase. Note de contenu : - EXPERIMENTAL : Materials - Preparation of maleic reactive surfactants - Synthesis of soap-free acrylate latex - Characterization - RESULTS AND DISCUSSION : Preparation of maleic reactive surfactants - Effects of maleic reactive surfactants on emulsion polymerization - H NMR analysis - GPC analysis - Effects of surfactants on particle sizes and their distribution - Stability against electrolyte - Viscosity - Effects of reactive surfactants on mechanical properties DOI : 10.1007/s11998-015-9696-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9696-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24956 [article]

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Rapid fabrication of large-scale structurally colored PS@SiO2 films with enhanced self-cleaning capability / Fen Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 489-499 Titre : Rapid fabrication of large-scale structurally colored PS@SiO2 films with enhanced self-cleaning capability Type de document : texte imprimé Auteurs : Fen Wang, Auteur ; Fuqiang Guo, Auteur ; Yu Xue, Auteur ; Hongjie Luo, Auteur ; Jianfeng Zhu, Auteur Année de publication : 2021 Article en page(s) : p. 489-499 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couleur Dioxyde de silicium Hydrophobie Oléophobie Polystyrène Revêtement auto-nettoyant Revêtements -- Propriétés optiques Revêtements organiques Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Structural colors are widespread in myriads of natural living organisms measuring from tens to hundreds of nanometers. In recent years, amorphous photonic crystal films have received extensive attention due to their stable color rendering properties. However, the internal structure of the films is easy to be contaminated by liquid. Thus, self-cleaning performance has been considered as one of the main obstacles to the practical application of artificial structural colored films. In order to solve the issues, we used heptadecafluoro-1,1,2,2-tetrahydrodacyl trimethoxysilane to modify the structural colored films. The results demonstrated that the modified colored films showed super-hydrophobic (contact angle > 160°) and high oleophobic (contact angle > 150°) properties. The rapid production of water-resistant and oil-resistant structural color coatings by spraying is significant for expanding their application in outdoor conditions (e.g., acid–base, alkali base, pollution) for a long time. Note de contenu : - EXPERIMENTAL : Chemicals and materials - Experimental process - Characterization - RESULTS AND DISCUSSION : Morphology of PS@SiO2 spheres - Optical properties of the structural colored films - Wettability and stability of PS@SiO2 surfaces coated with HFTHTMS - Scheme 1 : Schematic diagram for the synthesis of a stable amphiphobic PS@SiO2/AC films DOI : https://doi.org/10.1007/s11998-020-00418-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00418-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35609 [article]

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