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The oxidative degradation of heterophasic ethylene–propylene copolymers: a comparison of photoproduct formation under natural and accelerated conditions
Author(s) -
Mani R.,
Singh R. P.,
Sivaram S.
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199710)44:2<137::aid-pi808>3.0.co;2-w
Subject(s) - copolymer , polypropylene , ethylene , ethylene propylene rubber , tacticity , fourier transform infrared spectroscopy , materials science , degradation (telecommunications) , polymer chemistry , weathering , chemical engineering , photochemistry , chemistry , composite material , catalysis , organic chemistry , polymerization , polymer , telecommunications , geomorphology , computer science , engineering , geology
The natural weathering behaviour of various heterophasic ethylene–propylene (E–P) copolymers and their fractions was studied. The results are compared with those for polypropylene homopolymer (PP). The extent of natural weathering was monitored by Fourier transform infrared spectroscopy. Also, the photo‐oxidation behaviour of isotactic PP, heterophasic E–P copolymers and their fractions under natural exposure were compared with corresponding photoirradiated samples. The photoproducts are produced in the same relative proportions under accelerated and natural exposure, which shows that the mechanisms by which they are formed are not related to the temperature and the photon flux. ©1997 SCI