Multicolor Photoinitiators for Radical and Cationic Polymerization: Monofunctional vs Polyfunctional Thiophene Derivatives

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• 作者：Pu Xiao ; Fr茅d茅ric Dumur ; Damien Thirion ; S茅bastien Fagour ; Antoine Vacher ; Xavier Sallenave ; Fabrice Morlet-Savary ; Bernadette Graff ; Jean Pierre Fouassier ; Didier Gigmes ; Jacques Lalev茅e
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：September 10, 2013
• 年：2013
• 卷：46
• 期：17
• 页码：6786-6793
• 全文大小：502K
• 年卷期：v.46,no.17(September 10, 2013)
• ISSN：1520-5835

文摘

Thiophene and polythiophene derivatives have been prepared and used as photoinitiators upon visible light exposure. Their abilities to initiate, when combined with an iodonium salt (and optionally N-vinylcarbazole), a ring-opening cationic photopolymerization of epoxides and radical photopolymerization of acrylates under various different irradiation sources (i.e., very soft halogen lamp irradiation, laser diode at 405, 457, 473, 532, and 635 nm and blue LED bulb at 462 nm) have been investigated. These systems are characterized by a remarkable performance for purple to red light exposure. They are also particularly efficient for the cationic and radical photopolymerization of an epoxide/acrylate blend in a one-step hybrid cure and lead to the formation of an interpenetrated polymer network IPN (30 s for getting tack-free coatings). Their migration stability is excellent in the cured IPNs. The photochemical mechanisms are studied by steady state photolysis, fluorescence, cyclic voltammetry, electron spin resonance spin trapping, and laser flash photolysis techniques.