Concentration profiles in phase-separating photocuring coatings / Hirokazu Yoshihara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1629-1636 Titre : Concentration profiles in phase-separating photocuring coatings Type de document : texte imprimé Auteurs : Hirokazu Yoshihara, Auteur ; Masato Yamamura, Auteur Année de publication : 2019 Article en page(s) : p. 1629-1636 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Photoréticulation Polyfluorure de vinylidène Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Séparation (technologie) Spectroscopie Raman Terpolymère styrène anhydride maléïque Index. décimale : 667.9 Revêtements et enduits Résumé : We directly measured the local composition profiles in phase-separating photocurable thin films using confocal Raman spectroscopy. To avoid light scattering at phase interfaces, we developed a novel technique to replace the solvent with a monomer to match the reflective indices in the cured films. The results indicated that the concentration distribution of the polymer was uniform in solvent-free monomer/initiator binary solutions, while it was spatially nonuniform when the solvent-based films were thermodynamically unstable and promoted reaction-induced phase separation upon UV irradiation on the top surface. In the latter case, the film exhibited a dual-layer structure, in which the polymer concentration was almost uniform near the top surface, while concentration gradients developed near the bottom surface. The thickness of the top layer with a uniform concentration profile increased with the increase in the UV light intensity. These results implied that the propagation of the reaction front and the resulting light-driven transport of the solvent toward the bottom coating layer played key roles in the formation of nonuniform concentration profiles in photocuring solution coatings. DOI : 10.1007/s11998-019-00216-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00216-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33415 [article]

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