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Effect of unsaturated chain end‐group on thermal oxidative behavior of polypropylene
Author(s) -
Nakatani Hisayuki,
Suzuki Shoutarou,
Tanaka Takamasa,
Terano Minoru
Publication year - 2007
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/pi.2252
Subject(s) - tacticity , thermogravimetric analysis , polymer chemistry , oligomer , activation energy , oxidative phosphorylation , long chain , polypropylene , end group , materials science , catalysis , chemistry , organic chemistry , polymerization , polymer science , biochemistry , polymer
In order to clarify the influences of unsaturated chain end‐groups on the oxidative degradation of isotactic polypropylene (iPP), values of activation energy (Δ E ) for the oxidative degradation reactions of Ziegler‐catalyzed iPP (ZiPP) and metallocene‐catalyzed iPP (MiPP) having similar tacticity were evaluated by the temperature dependence of the oxidation induction time as determined by thermogravimetric analysis over the range 130–145 °C. The correlation between the content of unsaturated chain end‐groups and the change of Δ E was also studied. The results obtained indicated that the unsaturated chain end‐groups strongly influenced the rate of iPP degradation. Moreover, on addition of oligomer‐like MiPP having unsaturated chain end‐groups, the Δ E value of ZiPP became lower, suggesting that iPP having unsaturated chain end‐groups served as an infectious agent of the degradation. Copyright © 2007 Society of Chemical Industry