On the stratification mechanism of self-stratifying epoxy–acrylic coatings / Ali Abbasian 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. 559-568 Titre : On the stratification mechanism of self-stratifying epoxy–acrylic coatings Type de document : texte imprimé Auteurs : Ali Abbasian, Auteur ; S. Ekbatani, Auteur ; N. Bagherzadeh, Auteur Année de publication : 2021 Article en page(s) : p. 559-568 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère époxy acrylique Enrobage (technologie) Epaisseur -- Mesure Marangoni, Effet Revêtements autostratifiants Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : To shed light on the self-stratification mechanism in epoxy–acrylic coatings, 200-, 400-, and 800-micron-thick coatings were applied on glass and aluminum substrates, and their solidification behavior was studied. Some of the applied coats showed self-stratification behavior, with the thermoplastic acrylic copolymer in the top layer. In addition, experiments were performed on epoxy–acrylic solutions without hardeners to evaluate the resulting convective patterns on the solution surface, which exhibited finger-type convection. The final structure of the films had an apparent dependency on the thickness. Thicker films were usually more stratified and had a thicker stratified layer. As these observations could not support diffusion as the primary mechanism of self-stratification, convection experiments were done on epoxy and coatings solutions. The surface patterns on the solutions were studied, and the finger-type convection was observed. Based on these observations, we propose that convection may be the primary movement mechanism rather the diffusion of polymers toward the surface in the self-stratifying coats. Note de contenu : - Experimental - Results and discussion : Self-stratification tests - Thickness effect - Effect of substrate - Convection experiments in resin solutions - Table 1 : Specifications of curing agents - Table 2 : Specifications of acrylic copolymers DOI : https://doi.org/10.1007/s11998-020-00424-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00424-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35615 [article]

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