Degradation of acrylonitrile-butadiene-styrene and polycarbonate by UV irradiation
نویسنده
چکیده
The eects of ultra-violet irradiation on the microstructure of an oxygen free polymer viz., acrylonitrile-butadiene-styrene and a polymer containing oxygen viz., polycarbonate have been investigated using positron annihilation lifetime measurement. Lifetime results in both polymers in the early stages of irradiation indicate that chain-scission leading to free radical formation is the predominant process. Radiation induced cross-linking becomes dominant in the later stages of irradiation. An interesting feature observed in the present studies is that an oxygen containing polymer attains free volume stability which is attributed as due to the formation of photostabilisers whereas no such stability is observed in the case of an oxygen free polymer. UV absorption spectroscopy results supplement the positron lifetime results that oxygen containing polymer becomes photostabilised. # 2000 Elsevier Science Ltd. All rights reserved.
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