LET effect on cross-linking and scission mechanisms of PMMA during irradiation

被引：118

作者：

Lee, EH ^{[1
]}

Rao, GR ^{[1
]}

Mansur, LK ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA

来源：

RADIATION PHYSICS AND CHEMISTRY | 1999年 / 55卷 / 03期

关键词：

D O I：

10.1016/S0969-806X(99)00184-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mechanisms of scission and cross-linking are investigated for poly(methyl methacrylate) subjected to various irradiation sources, such as low LET radiation sources (MeV e-beams, Co-60 gamma-rays) and high LET ions (MeV He+, Ar+). PMMA properties were degraded upon irradiation by e-beam and gamma-rays, but were improved upon bombardment with high energy ion beams (HEIB) as a result of cross-linking. The results indicate that high LET produces a high concentration of free radicals over many neighboring molecular chains, facilitating track overlap and enhancing cross-linking over scission, while low LET affects only a single molecular chain, leading to chain scission. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：293 / 305

页数：13

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