Branching theories and thermodynamics used to help designing precursor architectures and binder systems / K. Dusek in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B2 (06/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B2 (06/2006) . - p. 123-131 Titre : Branching theories and thermodynamics used to help designing precursor architectures and binder systems Type de document : texte imprimé Auteurs : K. Dusek, Auteur ; R. Barsotti, Auteur ; J. Huybrechts, Auteur ; L. A. Lewin, Auteur ; M. Duskova-Smrckova, Auteur Année de publication : 2006 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cyclisation (chimie) Gélification Liants Réseaux polymères Réticulation (polymérisation) Revêtements organiques Thermochimie Index. décimale : 667.9 Revêtements et enduits Résumé : Cross-linking hydroxy-functional stars and copolymer precursors with a triisocyanate and associated structural changes were studied theoretically and experimentally. The model of network formation was based on the statistical generation of structures from units which were in different reaction states. The differences in gel point conversion and cross-link density were interpreted in terms of precursor functionality and functionality distribution, and differences in the reactivity of functional groups. Hydroxy-functional copolymer systems containing precursors of the same number-average functionality gel at lower conversions than stars which are monodispersed mainly due to functionality distribution. The structure of copolymers characteristic of several internal cross-links contributes more to the concentration of elastically-active network chains than stars with a single cross-link. Cyclization accompanies intermolecular cross-linking; its intensity is higher for copolymer systems compared with stars. Note de contenu : - Experimental systems and methods : Precursors - Methods - Results and discussion - Network build-up from precursors differing in architecture - theoretical description - Structure evolution for cross-linking of precursors of various architectures - Thermodynamic factors DOI : 10.1007/BF02699642 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699642.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5383 [article]

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