Epoxy Nucleophile catalyzed transesterification / Gary P. Craun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 841 (02/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 841 (02/1995) . - p. 23-30 Titre : Epoxy Nucleophile catalyzed transesterification Type de document : texte imprimé Auteurs : Gary P. Craun, Auteur Année de publication : 1995 Article en page(s) : p. 23-30 Note générale : Blibliogr. Langues : Américain (ame) Catégories : Catalyseurs Cinétique chimique Copolymères Epoxydes Esterification Haut extrait sec Polyacryliques Polyesters Réactions chimiques Réticulation (polymérisation) Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy nucleophile catalyzed transesterification (ENCAT) is a new cure technology, which is particularly well-suited for coatings application. Acrylic and acrylic-polyester blends in high-solids paints self-cure with ENCAT under normal bake conditions to give an excellent balance of hardness, flexibility, and solvent resistance. Powder paints prepared with ester derivatives of epoxy resins self-cure, and likewise give an excellent balance of properties. The ENCAT catalyst is formed during cure by the combination of a nucleophile with an epoxide moiety. A strong base alkoxide, which is produced when the epoxide ring opens by nucleophilic attack, initiates transesterification. This mechanism is supported by 13C NMR and gas chromatographic studies. rate of transesterification is related to the structure of the hydroxyl and ester group undergoing transesterification. Transesterification rate is directly related to the concentrations of the nucleophile and epoxy co-catalysts, as well as to the basicity and nucleophilicity of the nucleophile Note de contenu : - EXPERIMENTAL : Model compound studies - Transesterification rate by gas chromatography - Polymer synthesis - Paint preparation and testing - RESULTS AND DISCUSSION : Model compound studies - TRANSESTERIFICATION RATE STUDIES : Evidence of transesterification by gas chromatography - Transesterification rate : nucleophile and epoxy co-catalyst effects - Transesterification rate : ester and hydroxyl structure effects - Paint properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18490 [article]

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