Solution and solid C13 NMR studies of multifunctional polyolacrylate networks / Adrian Lungu in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 850 (11/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 850 (11/1995) . - p. 29-35 Titre : Solution and solid C13 NMR studies of multifunctional polyolacrylate networks Type de document : texte imprimé Auteurs : Adrian Lungu, Auteur ; Douglas C. Neckers, Auteur Année de publication : 1995 Article en page(s) : p. 29-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbone Copolymères réticulés Copolymérisation lasers Monomères Oligomères Photoréticulation Physique de l'état solide Polyoacrylates Résonance magnétique nucléaire Réticulation (polymérisation) Revêtements:Peinture Solutions (chimie) Structure moléculaire Index. décimale : 667.9 Revêtements et enduits Résumé : Several C13 NMR techniques are introduced to address the problem of structure determination of photopolymerized polyolacrylates, and to study both the liquid and solid states of acrylic monomers and oligomers, as well as the network structure formed upon their photopolymerization. By measuring the relative integration of specific peaks in the carbon spectra as a function of the time of irradiation and laser power, the relative reactivity of monomers/ oligomers used in the early stages of polymerization is determined. Changes in crosslink density and in the mobility of the polymeric chains can be followed throughout the photopolymerization process by monitoring proton T1ρ relaxation times. The degree of crosslinking is correlated to the relaxation times and it increases with an increasing power of the irradiating laser even under conditions where the degree of conversion, as measured by quantitative infrared absorption of the 810 cm-1 band of the acrylate is almost unchanged. Note de contenu : - EXPERIMENTAL : General - Sample preparation - RESULTS AND DISCUSSION : Liquid phase - Solid-state studies Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18572 [article]

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