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Graft-type polymer electrolyte membranes consisting of poly(ether ether ketone) prepared by radiation technique

放射線法を利用したポリエーテルエーテルケトンを基材としたグラフト型高分子電解質膜の開発

前川 康成; 長谷川 伸; 越川 博; Chen, J.

Maekawa, Yasunari; Hasegawa, Shin; Koshikawa, Hiroshi; Chen, J.

放射線グラフト重合法を、耐熱性,機械特性に優れたポリエーテルエーテルケトン(PEEK)膜に適用することで、従来の市販膜よりも機械強度で2.3倍かつ導電率で1.5倍の性能を有する高分子電解質膜の開発に成功した。このPEEK電解質膜は、95$$^{circ}$$Cで1000時間以上の連続運転可能なことを実証した。さらに、その高い機械強度を活かして、PEEK電解質膜の膜厚を従来の1/5以下である10$$mu$$mに薄膜化できた。薄膜化による膜抵抗低減により、0.2-1.0A/cm$$^{2}$$の電流密度領域で、従来膜よりも高い出力密度が達成できた。

We applied the radiation-induced grafting to poly(ether ether ketone) film, which was mechanically and thermally stable aromatic hydrocarbon polymers, so-called "super engineering plastics". The developed PEEK-based polymer electrolyte membrane (PEM) with 96 $$mu$$m thickness exhibited 1.5 times higher conductivity and 2.3 times higher mechanical strength, compared with conventional fluorinated PEM. The single fuel cell device maintained stable operation over 1000 hours under the operation at 95$$^{circ}$$C. According to the high mechanical strength of PEEK substrates, we could reduce the film thickness of PEEK-based PEM down to 10 $$mu$$m. The PEEK-based PEM with film thickness of 10 and 19 $$mu$$m showed higher cell voltages than that of Nafion at the current density in the range from 0.2 to 1.0 A/cm$$^{2}$$.

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