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Phenolic Hyperbranched Polymers as Additives in Cationic Photopolymerization of Epoxy Systems

✍ Scribed by Marco Sangermano; Aldo Priola; Giulio Malucelli; Roberta Bongiovanni; Andrea Quaglia; Brigitte Voit; Antje Ziemer

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
101 KB
Volume
289
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

Summary: 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.

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