Positron annihilation study of iodine sorption in acrylonitrile-butadiene-styrene

被引：0
|
作者：
Ramani, R [1 ]
Ramachandra, P [1 ]
Ramgopal, G [1 ]
Ranganathaiah, C [1 ]
机构：
[1] Univ Mysore, Dept Studies Phys, Mysore 570006, Karnataka, India
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 1998年 / 68卷 / 13期
关键词：
acrylonitrile-butadiene-styrene; positron lifetime; free volume; iodine sorption;
D O I：
10.1002/(SICI)1097-4628(19980627)68:13<2077::AID-APP3>3.0.CO;2-9
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The influence of iodine on the free volume of acrylonitrile-butadiene-styrene (ABS) was investigated by positron annihilation lifetime spectroscopy (PALS). The results indicate the filling of free-volume holes, formation of a positronium-iodine compound (PsI(2)/PsI), and possible charge-transfer complexes (CTCs) in the initial stages and the swelling of iodine in the final stages of sorption. The present study also revealed that iodine acts as a chemical quencher of o-Ps. The average size of the free volume suggests that Ig is the predominant species that fills up the free-volume holes during iodination. The diffusion process in the present case shows non-Fickian behavior and deviates from Fujita's free-volume concept as far as the fractional free volume and diffusion coefficient are concerned. (C) 1998 John Wiley & Sons, Inc.
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收藏
页码：2077 / 2085
页数：9
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