Abstract
Photooxidative degradation of polypropylene fibres which differ in the degree of orientation was studied. IR spectroscopy revealed that in the presence of light stabilizers the induction period of oxidation was prolonged and the accumulation of carbonyl groups in the fibre was slowed down. In highly oriented fibres the lowered mobility of chain segments in the amorphous regions after the transition from the spherulitic to fabrillar morphology also showed a stabilizing effect.
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