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

页码：431 / 435

页数：5

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