Positron annihilation investigations on poly(methyl methacrylate)

被引：6
|
作者：
Mohamed, HFM
Abd-Elsadek, GG
机构：
[1] El Minia Univ, Fac Sci, Dept Phys, El Minia, Egypt
[2] El Minia Univ, Fac Sci, Dept Chem, El Minia, Egypt
来源：
RADIATION PHYSICS AND CHEMISTRY | 2000年 / 58卷 / 5-6期
关键词：
D O I：
10.1016/S0969-806X(00)00225-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Positron lifetime and Doppler broadened annihilation radiation were measured for seven different samples of poly(methyl methacrylate) at room temperature in vacuum. The polymerisation of methyl methacrylate was carried out as a bulk polymerisation in the presence of benzoyl peroxide as an initiator. The effect of the amount of the initiator on the viscosity-average molecular weight was studied. It was found that the viscosity-average molecular weight decreased with increasing amount of the initiator. The average lifetime and intensity of ortho-positronium (o-Ps) increased with increasing viscosity-average molecular weight up to 6.85 x 10(4) and remained constant after that. The S-parameter showed a similar behaviour as that of the o-Ps intensity. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：597 / 601
页数：5
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