Positron annihilation and 129Xe NMR studies of free volume in polymers

被引：28
|
作者：
Nagasaka, B [1 ]
Eguchi, T
Nakayama, H
Nakamura, N
Ito, Y
机构：
[1] Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan
[2] Teijin Ltd, Mat Anal Res Labs, Hino, Tokyo 1918512, Japan
[3] Kobe Pharmaceut Univ, Kobe, Hyogo 6588558, Japan
[4] Univ Tokyo, Nucl Sci & Technol Res Ctr, Tokai, Ibaraki 3191106, Japan
来源：
RADIATION PHYSICS AND CHEMISTRY | 2000年 / 58卷 / 5-6期
关键词：
D O I：
10.1016/S0969-806X(00)00222-X
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：
The existence and the average size of foe volume in bisphenol-A polycarbonate (PC), low-density polyethylene (LDPE), poly (2,6-dimethyl-phenyleneoxide)(PPO), and polytetrafluoroethylene (PTFE) were studied by positron annihilation and Xe-129 NMR measurements. The Xe-129 NMR chemical shifts for xenon adsorbed in the polymers indicated that the average pore size of the free volume increased in the following order: PC, LDPE, PPO, and PTFE. This order of the pore size of the free volume agrees well with that estimated from the longest lifetime (rs) of ortho-positronium formed in the polymers. The unique correlation that delta(-1) proportional to r is established between the Xe-129 NMR chemical shift (delta) and the pore size (r), which is deduced from the positron annihilation measurements. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：581 / 585
页数：5
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