Effect of ammonium groups on the properties and alkaline stability of poly(arylene ether)‐based anion exchange membranes |
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| Authors: | Junpei Miyake Keita Fukasawa Masahiro Watanabe Kenji Miyatake |
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| Institution: | 1. Fuel Cells Nanomaterials Center, University of Yamanashi, , Kofu, Yamanashi, 400‐8510 Japan;2. Japan Science and Technology Agency, , Kawaguchi, Saitama, 332‐0012 Japan;3. Clean Energy Research Center, University of Yamanashi, , Kofu, Yamanashi, 400‐8510 Japan |
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| Abstract: | Five kinds of ammonium groups functionalized partially fluorinated poly(arylene ether) block copolymer membranes were prepared for investigating the structure–property relationship as anion exchange membranes (AEMs). Consequently, the pyridine (PYR)‐modified membrane showed the highest alkaline and hydrazine stability in terms of the conductivity, water uptake, and dry weight. The chloromethylated precursor block copolymers were reacted with amines, such as trimethylamine, N‐butyldimethylamine, 1‐methylimidazole, 1,2‐dimethylimidazole, and PYR to provide the target quaternized poly(arylene ether)s. The structures of the polymers, as well as model compounds and oligomers were well characterized by 1H NMR spectra. The obtained AEMs were subjected to water uptake and hydroxide ion conductivity measurements and stabilities in aqueous alkaline and hydrazine media. The pyridinium‐functionalized quaternized polymers membrane showed the highest alkaline and hydrazine stability with minor losses in the conductivity, water uptake, and dry weight. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 383–389 |
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| Keywords: | block copolymers degradation membranes polycondensation polyelectrolytes |
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