Water transport properties of crosslinked-PTFE based electrolyte membranes

摘要：

We measured the self-diffusion coefficient of water, D, in proton exchange membranes (PEMs) based on crosslinked polytetrafluoroethylene (PTFE) films by a radiotracer-permeation method using tritium labeled water (HTO). When the crosslinking density of the PTFE matrix increased, the D value became smaller. This decreasing trend coincided with that of a water-content parameter, λ, defined as the number of water molecules per sulfonic acid (SO3H) group. According to our proposed model of hydrophilic regions, the relationship between the D and A indicates that the amount of free water in the crosslinked-PTFE PEMs could be lower than that in the non-crosslinked one, thereby restricting the mobility of water molecules through strong interactions between the majority of water and SO3H groups.

关键词： Proton ezchange membrane (PEM) fuel cell Radiation grafting Crosslinked polytetrafluoroethylene Water transport Self-diffusion coefficient

作者: Shin-ichi Sawada Tetsuya Yamaki Hidetoshi Nishimura Masaharu Asano Akihiro Suzuki Takayuki Terai Yasunari Maekawa

作者单位: Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-129 Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-129 Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of

会议类型: 国际会议

会议名称: The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)

会议地点: 上海

会议语种:英文

页码: 1611-1614

在线出版日期: 2007-07-01（万方平台首次上网日期，不代表论文的发表时间）