POSITRON-ANNIHILATION IN AMINE-CURED EPOXY POLYMERS - PRESSURE-DEPENDENCE

被引：333
|
作者：
WANG, YY [1 ]
NAKANISHI, H [1 ]
JEAN, YC [1 ]
SANDRECZKI, TC [1 ]
机构：
[1] MCDONNELL DOUGLAS CORP,RES LABS,ST LOUIS,MO 63166
来源：
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 1990年 / 28卷 / 09期
关键词：
D O I：
10.1002/polb.1990.090280902
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Positron annihilation spectroscopy has been used to study free volume in an arnine‐cured epoxy as a function of external pressure at temperatures above and below the glass transition temperature. The observed ortho‐positronium lifetime τ3 and formation probability I3 decreased with increasing pressure. The decrease in τ3 is interpreted in terms of a corresponding decrease in average free‐volume hole size over the range from 0.135 to 0.045 nm3. The fractional free‐volume and the free‐volume compressibility in the epoxy are calculated as functions of pressure at 100°C. Copyright © 1990 John Wiley & Sons, Inc.
引用
收藏
页码：1431 / 1441
页数：11
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