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Proton‐Conducting Zirconium Pyrophosphate/Poly(2,5‐benzimidazole) Composite Membranes Prepared by a PPA Direct Casting Method
Author(s) -
Kim TaeHo,
Lim TaeWook,
Park YongSu,
Shin Kyusoon,
Lee JongChan
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700261
Subject(s) - membrane , phosphoric acid , benzimidazole , zirconium , materials science , zirconium phosphate , polymerization , casting , pyrophosphate , polymer chemistry , electrolyte , polymer , composite number , chemical engineering , nuclear chemistry , composite material , phosphate , chemistry , organic chemistry , biochemistry , electrode , engineering , metallurgy , enzyme
Zirconium pyrophosphate (ZPP)/poly(2,5‐benzimidazole) composites were prepared by polymerization of 3,4‐diaminobenzoic acid with zirconium hydrogen phosphate in polyphosphoric acid. The composite membranes for polymer electrolyte membranes were prepared by casting the polymerization solutions directly onto stainless steel plates. Membranes doped in 60 wt.‐% phosphoric acid solution had high proton conductivity values of more than 0.12 S · cm −1 (at 180 °C and 1% RH). Physical properties of the doped membranes, including the mechanical strength and dimensional stability, improved as ZPP content in the composites increased to 10–20 wt.‐%.