English Abstract
Effect of Sensitizer on Diene Polymers in Photodegradation of the Solution System
Yasuhiro SHIBATA
Hiroaki KOUZAI
Department of Applied Material and Life Science, Kanto Gakuin University, Yokohama, Japan
Nippon Gomu Kyokaishi,(2005),78(3),103-105 Original Paper in Japanese

It was confirmed that photodegradation of diene polymers in solutions is accelerated by the addition of carbazole as a sensitizer.
The viscosities of the polymer solutions in chloroform were markedly lowered with UV-irradiation when carbazole was added to the solution. The decrease in the solution viscosities, along with FT-IR and 1H NMR spectra of the irradiated polymers, indicates that the degradation of the diene polymers proceeds through the auto-oxidation mechanism. It was inferred that the acceleration effect of carbazole on the diene polymer degradation was caused by carbazyl radical cation generated by the dissociation of CT complex
between carbazole and solvent.

(Received on September 16, 2004)

(Accepted on January 14, 2005)

Diene polymer, Photodegradation, Sensitizer, Carbazole, UV, Auto-oxidation system