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Rate enhancement of amines in the photopolymerization of methyl methacrylate under oxygen
Author(s) -
Sato Rikiya,
Kurihara Tomoki,
Takeishi Makoto
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(1998100)47:2<159::aid-pi39>3.0.co;2-3
Subject(s) - photopolymer , diethylamine , photochemistry , triethylamine , radical , methyl methacrylate , oxygen , chemistry , methacrylate , reaction mechanism , polymerization , polymer chemistry , polymer , organic chemistry , catalysis
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 charge‐transfer 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. © 1998 Society of Chemical Industry