CAN POSITRON-ANNIHILATION LIFETIME SPECTROSCOPY MEASURE THE FREE-VOLUME HOLE SIZE DISTRIBUTION IN AMORPHOUS POLYMERS

被引：54

作者：

YU, Z ^{[1
]}

MCGERVEY, JD ^{[1
]}

JAMIESON, AM ^{[1
]}

SIMHA, R ^{[1
]}

机构：

[1] CASE WESTERN RESERVE UNIV,DEPT MACROMOLEC SCI,CLEVELAND,OH 44106

来源：

MACROMOLECULES | 1995年 / 28卷 / 18期

关键词：

D O I：

10.1021/ma00122a038

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We discuss the theoretical basis for relating the mean ortho-positronium (o-Ps) lifetime to free-volume hole sizes using a finite spherical potential well model. The status of the localized o-Ps atom in amorphous polymers is evaluated by calculation of the o-Ps barrier transmission probability. The results indicate that the relative probability for an o-Ps atom to remain in a particular hole during its entire lifetime is on the order of 10(-2). We conclude that there is no justification for a one-to-one correlation of o-Ps lifetime components with specific hole sizes.

引用

页码：6268 / 6272

页数：5

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