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Camphorquinone–amines photoinitating systems for the initiation of free radical polymerization

✍ Scribed by J. Jakubiak; X. Allonas; J.P. Fouassier; A. Sionkowska; E. Andrzejewska; L.Å. Linden; J.F. Rabek

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
186 KB
Volume
44
Category
Article
ISSN
0032-3861

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✦ Synopsis

Results of the camphorquinone/hindered piperidines, visible-light photoinduced polymerization of triethyleneglycol dimethacrylate are presented. The effectiveness of piperidines as a coinitiator is compared with a few aliphatic amines and aromatic amines. The main objective in this research was to study the mechanism of photoinitiation of polymerization. Reactive radicals that initiate the polymerization are formed by a mechanism of hydrogen atom abstraction by the triplet state of camphorquinone, mediated by photoinduced electron transfer. The different efficiencies of the aliphatic amines and of the aromatic amines affecting photopolymerization are explained on the basis of the different quenching reactivities of the excited states of camphorquinone.

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## Abstract **Summary:** Comparative studies of photoinitiation processes using camphorquinone (CQ) and benzophenone (BP) as light absorbers were performed. The experimental results show that after the transformation of (phenylthio)acetic acid (PTAA) into its tetrabutylammonium salt (PTAA AS), a su