Analysis of thermal degradation process of Nafion‐117 with age‐momentum correlation method |
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| Authors: | Yuji Shibahara Yoko Akiyama Yoshinobu Izumi Shigehiro Nishijima Yoshihide Honda Norio Kimura Seiichi Tagawa Goro Isoyama |
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| Institution: | 1. Graduate School of Engineering, Osaka University, 2‐1 Yamada‐oka, Suita, Osaka 565‐0871, Japan;2. Institute of Scientific and Industrial Research, Osaka University, 8‐1 Mihogaoka, Ibaraki, Osaka 567‐0047, Japan |
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| Abstract: | The thermal degradation of Nafion membrane was analyzed with age‐momentum correlation (AMOC) measurement and four‐electrode AC impedance measurement. In the heated sample, the decrease in proton conductivity was observed. The lifetimes and corresponding relative intensities showed fairly good agreement between heated and nonheated samples within the experimental error. In the analysis of the photopeak of annihilation γ‐ray, on the other hand, the difference between those two kinds of samples was observed, and this difference was found to be caused by the annihilation of free positrons with low energy electrons by using AMOC method. The decrease in proton conductivity was caused by the low energy electrons, namely sulfonic radicals. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1–7, 2008 |
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| Keywords: | degradation FT‐IR ionomers positron annihilation spectroscopy proton conductivity |
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