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Synthesis of Poly(2,5-benzimidazole) for Use as a Fuel-Cell Membrane

✍ Scribed by Hyoung-Juhn Kim; Sung Yong Cho; Sung Jin An; Yeong Chan Eun; Ju-Yong Kim; Hae-Kwon Yoon; Ho-Jin Kweon; Kyoung Han Yew

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
106 KB
Volume
25
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: Poly(2,5‐benzimidazole) (ABPBI) was synthesized in a novel polymerization medium containing CH~3~SO~3~H and P~2~O~5~. 3,4‐Diaminobenzoic acid, a monomer for ABPBI, is soluble in the medium and the polymerization was therefore performed in a homogeneous state. It produced polymer fibers, thus simplifying the work‐up process. The membrane was cast directly from the polymerization mixture. Proton conductivities of the ABPBI membranes ranged from 0.02 to 0.06 S · cm^−1^ above 100 °C, without humidification, and the tensile strength of the membrane was approximately 100 MPa.

Synthesis of ABPBI in a medium containing methanesulfonic acid and P~2~O~5~.

imageSynthesis of ABPBI in a medium containing methanesulfonic acid and P~2~O~5~.

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