Impact of Heating on the Structure of Perfluorinated Polymer Electrolyte Membranes: A Positron Annihilation Study

被引：23
|
作者：
Mohamed, Hamdy F. M. [1 ]
Kobayashi, Yoshinori [2 ]
Kuroda, Carlos S. [1 ]
Ohira, Akihiro [1 ,3 ]
机构：
[1] Technol Res Assoc, Fuel Cell Cutting Edge Ctr FC Cubic, Koto Ku, Tokyo 1350064, Japan
[2] Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan, Tsukuba, Ibaraki 3058565, Japan
[3] AIST, Res Inst Ubiquitous Energy Devices, Osaka 5638577, Japan
来源：
MACROMOLECULAR CHEMISTRY AND PHYSICS | 2011年 / 212卷 / 07期
关键词：
Aquivion E8705; fuel cells; Nafion NR212; positron annihilation; polymer electrolyte membranes; FREE-VOLUME; TEMPERATURE-DEPENDENCE; NAFION MEMBRANES;
D O I：
10.1002/macp.201000693
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The ortho-positronium (o-Ps) lifetime was measured as a function of temperature for the perfluorinated PEMs Nafion NR212 and Aquivion E8705. The o-Ps lifetime in Aquivion E8705 was found to be shorter than Nafion NR212 in the entire temperature range studied. Abrupt changes in the temperature coefficient of the o-Ps lifetime were noticed and the a-relaxation, b-relaxation, and stress relief temperatures were identified. It turned out that Aquivion E8705 has higher a-relaxation and stress relief temperatures than Nafion NR212. Dissociation of the ionic clusters and large change in the nanostructure after heating to 160 degrees C were observed for Nafion NR212 but not for Aquivion E8705. It is demonstrated that Aquivion E8705 has a higher thermal stability than Nafion NR212.
引用
收藏
页码：708 / 714
页数：7
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