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Rate enhancement of amines in the photopolymerization of methyl methacrylate under oxygen

✍ Scribed by Sato, Rikiya; Kurihara, Tomoki; Takeishi, Makoto

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 193 KB
Volume: 47
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(1998100)47:2<159::aid-pi39>3.0.co;2-3

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✦ Synopsis

The photopolymerization of methyl methacrylate was accelerated by amines such as N,N-dimethylbenzylamine, triethylamine, and diethylamine under nitrogen, in which additional initiating radicals were generated by the reaction of the amines with excited MMA. Enhanced rates were observed under oxygen for this photopolymerization in the presence of amines. Because UV spectra of the amines under oxygen indicated that the amines form chargetransfer complexes with oxygen, the rate enhancement was ascribed to photodecomposition of complexes that yield radical species. Molecular weights of polymers obtained in the photopolymerization in the presence of amines decreased under oxygen, supporting the assumed mechanism.

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