Effect of unsaturated chain end-group on thermal oxidative behavior of polypropylene
Effect of unsaturated chain end-group on thermal oxidative behavior of polypropylene
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DOI：
10.1002/pi.2252
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发表时间：
2007-09-01
影响因子：
3.2
通讯作者：
Terano, Minoru
中科院分区：
文献类型：
--
作者：
Nakatani, Hisayuki;Suzuki, Shoutarou;Terano, Minoru
为了阐明不饱和链端基对等规聚丙烯（iPP）氧化降解的影响，具有相似立构规整度的齐格勒催化的iPP（ZiPP）和异丙基苯催化的iPP（MiPP）的氧化降解反应的活化能（Δ E）的值通过氧化诱导时间的温度依赖性来评价，所述氧化诱导时间通过热重分析在130- 200 ℃范围内测定。145摄氏度同时还研究了不饱和链端基含量与声发射变化的相关性。结果表明，不饱和链端基强烈影响iPP的降解速率。此外，在添加具有不饱和链端基的低聚物样MiPP时，ZiPP的AE值变得更低，表明具有不饱和链端基的iPP充当降解的感染因子。(c)2007化学工业协会。
In order to clarify the influences of unsaturated chain end-groups on the oxidative degradation of isotactic polypropylene (iPP), values of activation energy (Delta 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 degrees C. The correlation between the content of unsaturated chain end-groups and the change of AE 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 AE value of ZiPP became lower, suggesting that iPP having unsaturated chain end-groups served as an infectious agent of the degradation. (c) 2007 Society of Chemical Industry.