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Onium Salts of Amino Acids as Co-Initiators in Photoinduced Free-Radical Polymerization

✍ Scribed by Franciszek Ścigalski; Magdalena Kryszak; Beata Jędrzejewska; Jerzy Pączkowski

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
204 KB
Volume
291
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

Summary: The onium salts of selected aliphatic and aromatic amino acids were investigated as electron donors in photoinduced free radical polymerization, in conjunction with either DIBF or BP as sensitizer. The laser flash photolysis experiments unmistakably documented that the free radical formation occurs via an electron transfer reaction from the amino acid salt to the chromophore triplet state. The kinetic studies clearly showed that either the DIBF or BP onium salts of selected aliphatic and aromatic sulfur‐containing amino acids exhibit a significant increase in the efficiency of free‐radical polymerization of TMPTA as compared to non‐sulfur‐containing co‐initiators and that the efficiency of all tested electron donors is only slightly dependent on the cation type coupled with co‐initiators tested.

Possible mechanism for the free radical photoinitiated polymerization.

magnified imagePossible mechanism for the free radical photoinitiated polymerization.

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