Abstract
The photodegradation of polypropylene (PP) and polypropylene containing pyrene (Py) as an additive has been studied by electron spin resonance (ESR), infra-red (IR) and ultra-violet (UV) absorption measurements. When PP film is irradiated with UV light at −196°C, alkyl-type radicals are produced. The radicals convert to the polyenyl-type on warming to room temperature. Oxygenated products are detected by IR spectroscopy. On photo-irradiating PP film containing Py, the same radicals and products as those in pure PP film are produced. Their amounts, however, are suppressed by the addition of Py. The photodegradation mechanism of PP and the protective effect of Py on the photodegradation of PP film are discussed on the basis of the experimental results.
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