Photodegradation of Heterophasic Ethylene-Propylene Copolymers in the Solid State
作者:
R.P. Singh,
Ajeet Singh,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1991)
卷期:
Volume 28,
issue 5-6
页码: 487-502
ISSN:0022-233X
年代: 1991
DOI:10.1080/00222339108052102
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The photodegradations of various heterophasic ethylene-propylene (E-P) copolymer films were studied at 30 and 55°C in air for varying time intervals. The photochemical behavior of E-P copolymers is quite different from amorphous polypropylene and polyethylene homopolymers but resembles that of isotactic polypropylene. The nonvolatile products in photooxidized copolymer films have been quantitatively identified by infrared analysis. The kinetics and general oxidation mechanism scheme for E-P copolymer are presented. The identification of γ-lactone is an indication of the importance of an intramolecular back-biting process. The overall functional group distribution is found to differ from that in polyethylene and E-P copolymers.
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