Synthesis of proton‐conducting block copolymer membranes composed of a fluorinated segment and a sulfonic acid segment |
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| Authors: | Kozo Matsumoto Fumiaki Ozaki Hideki Matsuoka |
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| Institution: | 1. Molecular Engineering Institute, Kinki University, 11‐6 Kayanomori Iizuka Fukuoka Prefecture 820‐8555, Japan;2. Department of Polymer Chemistry, Kyoto University, Katsura Nishikyo‐Ku, Kyoto 615‐8510, Japan |
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| Abstract: | Diblock copolymer membranes having a fluorinated segment and a sulfonic acid segment were prepared by living radical polymerization, solution casting, and crosslinking, followed by heat treatment. Diblock copolymers of 2,3,4,5,6‐pentafluorostyrene (PFS)/4‐(1‐methylsilacyclobutyl)styrene (SBS) and neopentyl styrenesulfonate (SSPen) (poly(PFS‐co‐SBS)‐b‐polySSPen)s were synthesized by nitoroxy‐mediated living radical polymerization. Self‐standing crosslinked membranes were obtained by casting a THF solution of the block copolymer with Pt catalyst. Heat treatment of the membrane at 230 °C induced decomposition of the neopentyl sulfonate esters to provide block copolymer membranes having a fluorinated segment and a free sulfonic acid segment. It was confirmed that the block copolymer with a high sulfonic acid content exhibited high ion exchange capacity and high proton conductivity as well as high thermal stability. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4479–4485, 2008 |
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| Keywords: | block copolymers crosslinking fluoropolymers ion exchangers |
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