Journal
ELECTROCHIMICA ACTA
Volume 45, Issue 8-9, Pages 1395-1398Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0013-4686(99)00349-7
Keywords
poly(benzimidazole); strong acid; proton conduction; acid-base interaction; hydrogen bonding interaction
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We synthesized thermally stable proton-conducting polymers composed of poly(benzimidazole) (PBI) and strong acids. PBI films were doped with strong acids such as phosphoric, sulfuric, and hydrochloric acid by immersing them into a mixed solution of strong acid and methanol. We found that the PBI films and strong acids formed polymer complexes because they showed the acid-base or the hydrogen bonding interactions between imidazole groups of PBI and acid molecules. The PBI/H3PO4 complexes were thermally stable up to 500 degrees C, and the proton conductivity of anhydrous complexes reached 10(-5) S cm(-1) at 160 degrees C. (C) 2000 Elsevier Science Ltd. All rights reserved.
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