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Studies on the photo‐oxidation mechanism of polymers. VI. The role of commercial thermostabilizers in the photostability of poly(vinyl chloride)
Author(s) -
Rabek J. F.,
Canbäck G.,
Rånby B.
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070210818
Subject(s) - vinyl chloride , tin , radical , photodissociation , gel permeation chromatography , polymer , polymer degradation , chemistry , photochemistry , spectroscopy , ultraviolet visible spectroscopy , chloride , degradation (telecommunications) , polymer chemistry , titration , polyvinyl chloride , reaction mechanism , organic chemistry , catalysis , telecommunications , physics , quantum mechanics , computer science , copolymer
This paper presents a study on the photolysis of PVC in the presence of different types of tin stabilizers. Using physicochemical methods such as ESR spectroscopy, conductivity titration, gel permeation chromatography, and absorption spectroscopy, the mechanism of PVC photolysis has been investigated. ESR spectroscopy shows that during UV irradiation of tin stabilizers, different types of free radicals depending on the chemical structure of the examined compounds are formed. It has been found that the presence of tin stabilizers does not significantly influence the photo‐oxidation and degradation of PVC but influences the crosslinking processes. The authors propose an interpretation of the free‐radical formation during UV photolysis of tin stabilizers and of the crosslinking acceleration mechanism.