FREE-RADICALS TRAPPED IN POLYETHYLENE CRYSTALS

被引:43
作者
BHATEJA, SK
DUERST, RW
AUS, EB
ANDREWS, EH
机构
[1] THREE M CO,THREE M CTR,CORP RES LAB,APRL,ST PAUL,MN 55144
[2] UNIV LONDON QUEEN MARY & WESTFIELD COLL,DEPT MAT,LONDON E1 4NS,ENGLAND
来源
JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS | 1995年 / B34卷 / 03期
关键词
D O I
10.1080/00222349508215534
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Electron-irradiated specimens of linear polyethylenes, aged at ambient conditions for periods between 79 and 112 months, were examined by electron spin resonance spectroscopy (ESR). Free radicals were found in all irradiated specimens, spin concentrations ranging from 0.5 x 10(16) spins/g to 3.5 x 10(16) spins/g and being nearly proportional to the original irradiation dose. For a given polyethylene, the radical concentration rises monotonically with crystallinity, suggesting that the free radicals are trapped in the crystalline phase. This would account for their longevity. At a given irradiation dose and crystallinity, the radical concentration is lower in normal molecular weight polymer than in ultrahigh molecular weight material. This difference may be explicable in terms of tie-chain concentration.
引用
收藏
页码:263 / 272
页数:10
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