Abstract
Oxidation of isotropic and oriented samples of high-density and low-density polyethylene (HDPE, LDPE) and of polypropylene (PP) was studied at 80° and p o 2 = 80 kPa. Orientation drawing prolongs the induction period of oxidation with HDPE, poly-4-methylpentene and PP, but shortens that of LPDE. The observed effects of orientation on the kinetics of polyolefin oxidation are explained by localization of the oxidation process in defect zones of intrafibrillar amorphous domains. Such localization is a consequence of changes in structural characteristics of the polyolefins caused by orientation drawing. In LDPE the oxidation process is accelerated due to the enhanced contribution of tertiary CH groups or side branches to the oxidation process.
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