Silyl Radical Chemistry and Conventional Photoinitiators: A Route for the Design of Efficient Systems

Three new efficient photoinitiators (PI) based on a well-known chromophore skeleton (hydroxyphenylacetophenone, thioxanthone, or benzoin) linked to a silyl-containing moiety are proposed. The ability of these structures to initiate both free radical polymerization and free radical promoted cationic...

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Bibliographic Details
Published in:Macromolecules 2009-08, Vol.42 (16), p.6031-6037
Main Authors: Lalevée, J, Blanchard, N, Chany, A. C, El-Roz, M, Souane, R, Graff, B, Allonas, X, Fouassier, J. P
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Physicochemistry of polymers
Polymerization
Polymers and radiations
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Summary:Three new efficient photoinitiators (PI) based on a well-known chromophore skeleton (hydroxyphenylacetophenone, thioxanthone, or benzoin) linked to a silyl-containing moiety are proposed. The ability of these structures to initiate both free radical polymerization and free radical promoted cationic polymerization is investigated. A comparison with parent compounds is provided. High rates of polymerization and high final conversions are obtained. These PI directly generate silyl radicals under light irradiation as characterized by ESR spin-trapping. The analysis of the excited-state processes through laser flash photolysis and quantum molecular calculations allow to explain the observed photochemical behavior. The present results evidence the high potential of these new modified PI.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma901003h