Characterization of polymer sub-surface using slow positron beam

被引：12
|
作者：
He, C [1 ]
Hamada, E
Suzuki, T
Kobayashi, H
Kondo, K
Shantarovich, VP
Ito, Y
机构：
[1] High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan
[2] Inst Environm Sci, Rokkasho, Aomori 0393212, Japan
[3] Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 117334, Russia
[4] Univ Tokyo, JAERI, RCNT, Tokai, Ibaraki 3191106, Japan
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2003年 / 255卷 / 03期
关键词：
D O I：
10.1023/A:1022599408630
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A new pulsed mono-energetic slow positron beam as well as the conventional positron annihilation lifetime spectroscopy (PALS) have been applied to study the sub-surface and the bulk of epoxy polymer. Significant changes of o-Ps parameters were found at a short distance from the surface. The lifetime of o-Ps was observed to decrease with increasing the positron implantation depth, while its intensity increased. The temperature effect on o-Ps parameters at sub-surface was also investigated. The glass transition temperature for the sub-surface was lower than that for the bulk. Furthermore, the thermal expansion coefficient of the sub-surface was found smaller than that of the bulk.
引用
收藏
页码：431 / 435
页数：5
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