Study of the effect of electric field on positron annihilation parameters in polymers

被引：9
|
作者：
Mohamed, HFM [1 ]
机构：
[1] Menia Univ, Fac Sci, Dept Phys, Menia 61519, Egypt
来源：
RADIATION PHYSICS AND CHEMISTRY | 2003年 / 68卷 / 3-4期
关键词：
polymer; electric field; positron annihilation lifetime; positronium formatior;
D O I：
10.1016/S0969-806X(03)00203-2
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：
Positron annihilation lifetime measurements have been performed to study the effect of an external electric field in several polymers. The application of the electric field on polytetrafluoroethylene (PTFE) and ultrahigh-molecular weight polyethylene (UHMWPE) noticeably decreased the ortho-positronium (o-Ps) intensity. The o-Ps intensity increased with increasing electric field strength in the poly(ethylene terephthalate), PET, poly(ethylene naphthalate), PEN, and poly(aryl-ether-ether-ketone), PEEK samples. The data are consistent with a hypothesis that nonpolar polymers (PTFE and UHMWPE) show a decrease in the o-Ps intensity with increasing electric field, while the effect seems to be opposite in polar polymers (PEN, PET and PEEK). (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：449 / 452
页数：4
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