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

被引：10

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

页码：449 / 452

页数：4

共 9 条

[1]

GOLDANSK.VI, 1968, ATOM ENERGY REV, V6, P3

[2] Effect of electric field strength and exposure time on epoxy and high density polyethylene measured by positron annihilation lifetime [J].