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The deterioration of polypropylene by oxidative degradation
Author(s) -
Oswald H. J.,
Turi E.
Publication year - 1965
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760050312
Subject(s) - polypropylene , degradation (telecommunications) , materials science , oxygen , extrapolation , absorption (acoustics) , irradiation , limiting oxygen concentration , stabilizer (aeronautics) , composite material , organic chemistry , chemistry , mechanical engineering , computer science , telecommunications , mathematical analysis , physics , mathematics , nuclear physics , engineering
An explanation is presented to account for the deterioration of the mechanical properties at very low concentrations of absorbed oxygen. The induction time as measured by the oxygen absorption technique overestimates the time to failure with respect to the mechanical properties. Furthermore, it is shown that the extrapolation of accelerated aging data as obtained at elevated temperatures should not be carried out below 50°C. Data are presented to show that an anti‐oxidant is one of the major constituents of a stabilizer system against UV radiation, because the oxidative degradation mechanism is involved. A modified oxygen uptake equipment is described which allows the simultaneous determination of the oxygen absorption and the deterioration of the mechanical properties on the same sample.