Model compound study for acrylic latex crosslinking reactions with cycloaliphatic epoxides / Shaobing Wu in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 869 (06/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 869 (06/1997) . - p. 43-49 Titre : Model compound study for acrylic latex crosslinking reactions with cycloaliphatic epoxides Type de document : texte imprimé Auteurs : Shaobing Wu, Auteur ; Mark D. Soucek, Auteur Année de publication : 1997 Article en page(s) : p. 43-49 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères Epoxydes Latex Polyacryliques Polymères aliphatiques Réticulation (polymérisation) Tags : 'Acrylique  acide  copolymère'  'Méthacrylate  d'hydroxyéthyle'  Latex  Réticulation  Epoxyde  'Composé  bicyclique'  'Réaction  modèle'  Cinétique  'Mécanisme  réaction'  Régiosélectivité  'Effet  température'  pH  Stoechiométrie Index. décimale : 667.9 Revêtements et enduits Résumé : Cyclohexene oxide, methanol, and acetic acid were used as model compounds to study the competitive crosslinking of cycloaliphatic diepoxides with hydroxyl and carboxyl functionalized acrylic copolymers. Model reactions were performed as a function of molar ratio, pH, and temperature. At a 2:1:1 molar ratio of epoxide: hydroxyl: carboxyl, the formation of the primary ether and ester linkages were found to be the major crosslinking reactions. By increasing the molar ratio to 3:1:1, the formation of both the ether and ester oligomer products were significantly enhanced. As the pH of the media decreased, the rate of the crosslinking reactions increased, and generally ester products were formed preferentially to ether products. A temperature dependence of the rate of reactions were generally more pronounced at higher pH. Note de contenu : - EXPERIMENTAL SECTION : Materials - Instrumentation - General procedure for model reactions - Sampling and GC analysis - RESULTS AND DISCUSSION : Model compound products and molar ratio effect on product formation - pH effect on the formation of primary and secondary ether and ester products - Temperature effect on the formation of primary and secondary products - Proposed crosslinking modes for cycloaliphatic epoxides with hydroxyl and carboxyl functionalized acrylic copolymers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18245 [article]

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