Studies on the photo-oxidation mechanism of polymers—IX. The photo-sensitized oxidation of cis-1,4-polybutadiene by n-methyl-2-benzoyl- β-naphthiazoline

This paper presents a study of mechanisms of photo-sensitized oxidation of cis-1,4-polybutadiene by N-methyl-2-benzoyl- β-naphthiazoline (BN) in solution. Detailed photochemical study of BN shows that the lowest triplet state of BN has an energy of 54.3 cal mol −1 and a life-time of 0.20 s at 77 K....

Full description

Saved in:
Bibliographic Details
Published in:European polymer journal 1979, Vol.15 (4), p.339-348
Main Authors: Rabek, J.F., Rämme, G., Canbäck, G., Rånby, B., Kagiya, V.T.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper presents a study of mechanisms of photo-sensitized oxidation of cis-1,4-polybutadiene by N-methyl-2-benzoyl- β-naphthiazoline (BN) in solution. Detailed photochemical study of BN shows that the lowest triplet state of BN has an energy of 54.3 cal mol −1 and a life-time of 0.20 s at 77 K. In addition, rate constants for the quenching of the triplet state of BN have been calculated. These results show the possibility of energy transfer from excited triplet state to molecular oxygen with formation of singlet oxygen, which can further react with another BN molecule (photo-decomposition of BN) or with cis-1,4-polybutadiene added. During light irradiation of BN, free radicals are formed; they can initiate polymer chain scission and crosslinking.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(79)90153-8