Authors Sangermano, M. ; Priola, A. ; Malucelli, G. ; Bongiovanni, R. ; Quaglia, A. ; Voit, B. ; Ziemer, A.
Title Phenolic Hyperbranched Polymers as Additives in Cationic Photopolymerization of Epoxy Systems
Date 14.05.2004
Number 11943
Abstract A phenolic group containing hyperbranched polyester (HBP) was synthesized and employed as chain transfer agent in cationic photopolymerization of a biscycloaliphatic epoxy monomer (CE). The epoxy group conversion increases by increasing the amount of HBP in the photocurable resin, due to a chain transfer reaction involving the phenolic-OH groups. HBP acts as a plasticizer inducing decrease of the T(g) values together with an increase of the toughness properties. Meanwhile gel content increases together with the E´ values. By increasing the amount of HBP in the photocurable resin an increase of the density is evident indicating a decrease of free volume. Therefore an improvement of the gas barrier properties might be expected; at the same time an increase of the thermal stability is evident.
Publisher Macromolecular Materials and Engineering
Wikidata Q57708690
Citation Macromolecular Materials and Engineering 289 (2004) 442-446
Tags cationic photopolymerization epoxy monomers hyperbranched polymers thermal stability toughness properties chain transfer agent polyester monomer resins microparticles

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