Preparation and characterization of proton exchange membranes based on semi-interpenetrating sulfonated poly(imide-siloxane)/epoxy polymer networks

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• 作者：Chi-Hung Lee^a ; ¹ ; Szu-Hsien Chen^a ; ¹ ; Yen-Zen Wang^b ; Chao-Chien Lin^b ; Chih-Kai Huang^a ; Ching-Nan Chuang^a ; Chih-Kuang Wang^c ; ^{ckwang@kmu.edu.tw} ; Kuo-Huang Hsieh^a ; ^{khhsieh@ntu.edu.tw}
• 关键词：Epoxy ; Semi-interpenetrating ; Sulfonated polyimide ; Durability ; Proton exchange
• 刊名：Energy
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：55
• 期：Complete
• 页码：905-915
• 全文大小：2643 K

文摘

We prepared and characterized a series of semi-IPN (semi-interpenetrating polymer network) membranes based on SPISX-EP (sulfonated polyimide-siloxane and epoxy) polymers and compared their properties with those of a pure SPISX membrane and a commercially available proton exchange membrane. Overall, the SPISX5-EP (with 5?wt % PDMS (¦Á,¦Ø-diaminopropyl polydimethylsiloxane) in SPISX) membranes can be exhibited desirable mechanical properties and thermal stabilities, with proton conductivities superior to those of Nafion^? 117 at 80?¡ãC. The dimensional changes of the membranes and degrees of methanol transport decreased with increasing epoxy content; here, the effect of crosslinking had a greater effect than did the increased number of ionic exchange sites. The proton conductivities and methanol permeabilities of the membranes ranged from 10^?3 to 10^?2?S/cm and from 10^?9 to 10^?7?cm²/s, respectively, in the temperature range 25-90?¡ãC. Transmission electron microscopy images indicated that the presence of large, well-connected hydrophilic domains was responsible for the large hydrolytic stability of the SPISX5-EP membranes; infrared spectroscopy confirmed these results. SPISX5-EP membranes featuring epoxy compositions of 30 and 40 % exhibited greater hydrolytic stability relative to the corresponding SPISX membranes, suggesting their potential application as proton-conducting membranes in fuel cells.