Counter-Anion Effect on the Properties of Anion-Conducting Polymer Electrolyte Membranes Prepared by Radiation-Induced Graft Polymerization

Graft‐type anion‐conducting polymer electrolyte membranes (AEMs) are prepared by the radiation‐induced graft polymerization of chloromethylstyrene into poly(ethylene‐co‐tetrafluoroethylene) (ETFE) films and subsequent quaternization with trimethylamine. AEMs in the hydroxide form (AEM‐OH) are prepar...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2013-08, Vol.214 (15), p.1756-1762
Main Authors: Koshikawa, Hiroshi, Yoshimura, Kimio, Sinnananchi, Warapon, Yamaki, Tetsuya, Asano, Masaharu, Yamamoto, Kazuya, Yamaguchi, Susumu, Tanaka, Hirohisa, Maekawa, Yasunari
Format: Article
Language:English
Subjects:
anion-conducting polymer-electrolyte membranes (AEMs)
Applied sciences
Bicarbonates
Chlorides
chloromethylstyrene (CMS)
counter anions
Electrolytes
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Grafting
Hydroxides
Membranes
poly(ethylene-co-tetrafluoroethylene) (ETFE)
Polymer industry, paints, wood
Polymerization
radiation-induced graft polymerization
Technology of polymers
Uptakes
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Summary:Graft‐type anion‐conducting polymer electrolyte membranes (AEMs) are prepared by the radiation‐induced graft polymerization of chloromethylstyrene into poly(ethylene‐co‐tetrafluoroethylene) (ETFE) films and subsequent quaternization with trimethylamine. AEMs in the hydroxide form (AEM‐OH) are prepared by immersing the chloride form (AEM‐Cl) in 1 M potassium hydroxide (KOH) solution, followed by KOH and washing with nitrogen‐saturated water to prevent bicarbonate formation (AEM‐HCO3). The AEM‐OH shows conductivity and water uptake four and two times higher than AEM‐Cl and ‐HCO3 and is thermally and chemically less stable, resulting in the tendency to absorb water and to convert to the bicarbonate form. Graft‐type anion‐conducting polymer electrolyte membranes are prepared to evaluate the counter‐anion effects on fuel cell properties. The hydroxide form shows conductivity and water uptake four and two times higher than the chloride and bicarbonate forms. The hydroxide form is thermally and chemically less stable, resulting in the tendency to absorb water and to convert to the bicarbonate form.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201300225