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Synthesis of Poly(2,5‐benzimidazole) for Use as a Fuel‐Cell Membrane
Author(s) -
Kim HyoungJuhn,
Cho Sung Yong,
An Sung Jin,
Eun Yeong Chan,
Kim JuYong,
Yoon HaeKwon,
Kweon HoJin,
Yew Kyoung Han
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200300288
Subject(s) - methanesulfonic acid , polymerization , membrane , monomer , polymer chemistry , benzimidazole , polymer , materials science , chemistry , organic chemistry , biochemistry
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 .