Degradation of unstabilised polypropylene and a propene-1-pentene copolymer -: art. no. 012

被引：0
|
作者：
de Goede, S
Brüll, R
Pasch, H
Marshall, N
机构：
[1] Deutsch Kunststoff Inst Darmstadt, D-64289 Darmstadt, Germany
[2] SASOL Polymers, ZA-1645 Modderfontein, South Africa
[3] SASOL Wax, ZA-1947 Sasolburg, South Africa
来源：
E-POLYMERS | 2004年
关键词：
D O I：
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中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The degradation of polypropylene (PP) and a propene-l-pentene copolymer (P2) have been monitored with regard to chemical composition, molar mass distribution and chemical composition distribution. The increase in the carbonyl index can be monitored by IR and a decrease in molar mass can be observed from size-exclusion chromatography (SEC). CRYSTAF shows that the chemical heterogeneity of the samples broadens with continuing degradation. SEC-FTIR reveals that the degraded species are mainly found in the low-molecular-weight end of the molar mass distribution. Spatial heterogeneity of the degradation process has been proven by the analysis of abrased layers. It was found that the P2 copolymer degrades at a higher rate compared to PP.
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页数：9
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