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Tetraalkylammonium Salts of Amino Acids and Sulfur-Containing Amino Acids as Effective Co-Initiators of Free Radical Polymerization in the Presence of Aromatic Ketones

✍ Scribed by Franciszek Ścigalski; Jerzy Pączkowski

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
279 KB
Volume
209
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Photoredox pairs, composed of xanthone or thioxanthone derivatives acting as light absorbers and tetrabutylammonium salts of amino acids or sulfur‐containing amino acids as co‐initiators, were studied as photoinitiators for free‐radical polymerization. The mechanism of free‐radical formation was established using the laser flash photolysis. Measurements of polymerization kinetics show that the photoinitiation ability of the xanthone‐ or thioxanthone‐derivative/amino acid or sulfur‐containing amino acid pairs depends on the initiator and co‐initiator properties, mostly on the triplet state lifetime of xanthone or thioxanthone derivatives.

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