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Polystyrene-b-poly(2-vinyl phenacyl pyridinium) salts as photoinitiators for free radical and cationic polymerizations and their photoinduced molecular associations

Paper ID Volume ID Publish Year Pages File Format Full-Text
25905 43917 2014 7 PDF Available
Title
Polystyrene-b-poly(2-vinyl phenacyl pyridinium) salts as photoinitiators for free radical and cationic polymerizations and their photoinduced molecular associations
Abstract

•PS-b-PVPP photoinitiator initiates radical and cationic polymerizations.•The initiation of the polymerization involves homolytic and heterolytic scission.•Photoinduced switching behavior of PS-b-PVPP was demonstrated by surface analysis.

Polystyrene-b-poly(2-vinyl phenacyl pyridinium hexafluorophosphate) (PS-b-PVPP) was synthesized by reacting polystyrene-b-poly(2-vinyl pyridine) prepared by living anionic polymerization with phenacyl bromide followed by counter anion exchange reaction. The ability of PS-b-PVPP to act as a photoinitiator for both free radical and cationic polymerizations is demonstrated. In the free radical polymerization, the initiation step involves the decay of the excited state of the salt with homolytic bond rupture of the nitrogen–carbon bond. For the cationic polymerization, homolytic cleavage followed by electron transfer and/or heterolytic scission reactions are responsible for the generation of reactive species. Photoinduced switching behavior of PS-b-PVPP from ionic to neutral state was also demonstrated by surface analysis, particle size and film thickness measurements.

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Keywords
Phenacyl pyridinium salt; Photodecomposition; Photopolymerization; Cationic polymerization; Free radical polymerization; Photochemical switch
First Page Preview
Polystyrene-b-poly(2-vinyl phenacyl pyridinium) salts as photoinitiators for free radical and cationic polymerizations and their photoinduced molecular associations
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 285, 1 July 2014, Pages 30–36
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering