Temperature dependence of free volume of polyacrylamide gels studied by positron lifetime measurements

被引：3
|
作者：
Ito, K [1 ]
Ujihira, Y [1 ]
Yamashita, T [1 ]
Horie, K [1 ]
机构：
[1] Univ Tokyo, Grad Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, 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)00210-3
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：
Changes of positronium (Ps) cavity radii in polyacrylamide and poly(N-isopropylacrylamide) gels were studied from 120 to 300 K by positron lifetime technique and it has been shown that the Ps cavity radius in the hydrogels changes by three or four stages. Temperature dependence of the Ps cavity radius exhibits variations similar to common polymers around the glass transition temperature. Hydrophilicity of the polymer chains significantly affects the Ps cavity radius just below 273 K. These results suggest an important role of free volume on the state of water in hydrogels. (C) 2000 Published by Elsevier Science Ltd.
引用
收藏
页码：521 / 524
页数：4
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