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Mechanisms of antioxidant action: The effect of spin traps during the processing and photooxidation of PVC
Author(s) -
Adeniyi J. B.,
AlMalaika S.,
Scott G.
Publication year - 1987
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.1987.070340804
Subject(s) - radical , propane , degree of unsaturation , scavenger , chemistry , polymer , photochemistry , tin , hydrogen chloride , antioxidant , organic chemistry , polymer chemistry
Abstract It is demonstrated by the use of spin traps that during the early stages of thermal processing of PVC considerable concentrations (> 3 × 10 −6 mol g −1 ) of free radicals are produced which are primarily responsible for the initial products (hydroperoxides, unsaturation, and hydrogen chloride) previously shown to be formed in the polymer. From a semiquantitative analysis of these products, it is estimated that more than 50% of the radicals are formed from hydroperoxides and the rest by mechanoscission of the polymer chain. The spin traps are effective processing stabilizers in combination with a tin maleate HC1 scavenger. One of them (2‐methyl‐2‐nitroso propane, MNP) has also been shown to be a photoantioxidant.