EFFECTS OF AGING AND OXIDATION ON POSITRONIUM FORMATION IN POLYETHYLENES

被引：21

作者：

SUZUKI, T

OKI, Y

NUMAJIRI, M

MIURA, T

KONDO, K

ITO, Y

SHIOMI, Y

机构：

[1] UNIV TOKYO,NUCL SCI & TECHNOL RES CTR,TOKAI,IBARAKI 31911,JAPAN

[2] SUMITOMO CHEM LTD,TSUKUBA RES CTR,TSUKUBA,IBARAKI 305,JAPAN

来源：

RADIATION PHYSICS AND CHEMISTRY | 1994年 / 43卷 / 06期

关键词：

D O I：

10.1016/0969-806X(94)90167-8

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 lifetimes (PAL) have been measured for polyethylenes (PEs) under different conditions of heat treatment. It is shown that the intensity, I3, of the long-lived component of positronium (Ps) shows hystereses between the heating and cooling processes due to aging effect, It is also shown that about half of Ps observed at low temperatures below the glass transition is inhibited after the sample is heat-treated above the melting point in the atmosphere containing oxygen. It is suggested that carbonyl groups [GRAPHICS] formed by thermal oxidation can inhibit Ps formation through trapping the precursors of Ps, e+ and/or e-.

引用

页码：557 / 562

页数：6

共 17 条

[1] ON THE ORIGIN OF THE INTERMEDIATE COMPONENT IN THE POSITRON LIFETIME SPECTRA IN POLYMERS [J].