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Synthesis of Poly (2,2′-(1,4-phenylene) 5,5′-bibenzimidazole) (para-PBI) and Phosphoric Acid Doped Membrane for Fuel Cells

✍ Scribed by S. Yu; H. Zhang; L. Xiao; E.-W. Choe; B. C. Benicewicz

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
191 KB
Volume
9
Category
Article
ISSN
1615-6846

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✦ Synopsis

Abstract

A detailed investigation of the polymerisation conditions for poly(2,2′‐(1,4‐phenylene)5,5′‐bibenzimidazole) (para‐PBI) in polyphosphoric acid (PPA) led to the preparation of high molecular weight polymer. The polymer solutions could be used directly to produce phosphoric acid (PA)‐doped PBI membranes by the PPA process. These membranes showed very high PA doping levels, i.e., up to ∼30 moles of PA per mole of PBI repeat unit. The ionic conductivity of the membranes was 0.24 S cm^–1^ at 160 °C. Fuel cell performance was measured at various operating conditions by changing temperature, pressure and gases and verified the high carbon monoxide (CO) tolerance of fuel cells operating at this temperature.

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Copolymers of Poly(2,5-benzimidazole) an
Copolymers of Poly(2,5-benzimidazole) and Poly[2,2′-(p-phenylene)-5,5′-bibenzimidazole] for High-Temperature Fuel Cell Applications
✍ Sung-Kon Kim; Tae-Ho Kim; Jung-Woo Jung; Jong-Chan Lee 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 334 KB

## Abstract Copolymers of poly(2,5‐benzimidazole) (ABPBI) and poly[2,2′‐(__p__‐phenylene)‐5,5′‐bibenzimidazole] (__p__PBI) were synthesized for use as fuel cell membranes to take advantage of the properties of both constituents. The composition of the copolymers were controlled by changing the feed