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

Date

2014-07-01

Author

Taskin, Omer Suat
Erel Göktepe, İrem
Khan, Muhammad Alyaan Ahmed
Pispas, Stergios
Yağcı, Yusuf

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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.

Subject Keywords

General Physics and Astronomy, General Chemistry, General Chemical Engineering

URI

https://hdl.handle.net/11511/48196

Journal

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

DOI

https://doi.org/10.1016/j.jphotochem.2014.03.018

Collections

Department of Chemistry, Article

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Citation Formats

O. S. Taskin, İ. Erel Göktepe, M. A. A. Khan, S. Pispas, and Y. Yağcı, “Polystyrene-b-poly(2-vinyl phenacyl pyridinium) salts as photoinitiators for free radical and cationic polymerizations and their photoinduced molecular associations,” JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, pp. 30–36, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48196.