Premium
Study of the effect of γ‐dose rate on the oxidation of polypropylene
Author(s) -
Tidjani Adams,
Watanabe Yasushi
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960613)60:11<1839::aid-app7>3.0.co;2-m
Subject(s) - polypropylene , crystallinity , elongation , fourier transform infrared spectroscopy , polymer , ultimate tensile strength , derivatization , polymer chemistry , materials science , degradation (telecommunications) , ketone , chemistry , chemical engineering , nuclear chemistry , organic chemistry , composite material , high performance liquid chromatography , telecommunications , computer science , engineering
Polypropylene PP (high and low crystallinity) was λ‐oxidized, in the presence of air, using different dose rates (from 2 to 100 rad/s). Oxidation outcomes were identified and quantified by FTIR spectroscopy coupled with derivatization reactions (NO and SF 4 ). The difficulty to separate secondary and tertiary hydroperoxides from FTIR measurements after NO treatment was addressed. Polymer physical degradation was also monitored during the λ‐irradiation process. GPC was used to follow molecular weight changes and tensile tests for elongation at break modifications. Comparison of the extent of oxidation product for‐mation over λ‐irradiation allowed us to investigate the importance of λ‐dose rate on chemical and physical changes of PP. From this, different mechanisms of ketone and ester formation were examined; relationship between the molecular weight changes and the elongation at break modifications was also investigated. © 1996 John Wiley & Sons, Inc.