Copolymers of Poly(2,5‐benzimidazole) and Poly[2,2′‐(p‐phenylene)‐5,5′‐bibenzimidazole] for High‐Temperature Fuel Cell Applications

Abstract

Copolymers of poly(2,5‐benzimidazole) (ABPBI) and poly[2,2′‐(p‐phenylene)‐5,5′‐bibenzimidazole] (pPBI) 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 ratio of 3,4‐diaminobenzoic acid and terephthalic acid with 3,3′‐diaminobenzidine in the polycondensation reaction. The copolymer membranes showed higher conductivities, better mechanical properties, and larger acid absorbing abilities than commercial poly[2,2′‐(m‐phenylene)‐5,5′‐bibenzimidazole] membranes.magnified image

Design and Synthesis of Cross-Linked Copolymer Membranes Based on Poly(benzoxazine) and Polybenzimidazole and Their Application to an Electrolyte Membrane for a High-Temperature PEM Fuel Cell

“…The sequence of the experimental steps applied during this polymerization procedure is identical to that in the literature [94,104]. The following reaction scale is the basic composition for synthesizing various types of PBI derivatives for material screening.…”

“…The PA content of the membrane was then calculated using Equation (4). PA-doped ABPBI and PBI membranes were also prepared by a commonly used solution-casting method [68,104].…”

Tuning transport properties by manipulating the phase segregation of tetramethyldisiloxane segments in modified polyimide electrolytes

“…Various sulfonated aromatic polymers, such as: poly(aryl ether sulfone) [3][4][5][6], poly(ether ketone) [7,8], polyimide (PI) [9][10][11][12][13][14][15][16][17][18], Polybenzimidazole (PBI) [19][20][21][22][23], etc. have been proposed as alternative membrane materials.…”

Fabrication and investigation of phosphoric acid doped imidazolium siloxane crosslinked poly(2,6‐dimethyl‐1,4‐phenylene oxide) for high temperature polymer electrolyte membranes

“…Therefore, the development of high temperature polymer electrolyte membranes (HT‐PEMs) for fuel cells has attracted much attention recently. The phosphoric acid (PA) doped polybenzimidazole (PBI) membrane has been considered as one of the most promising candidates for HT‐PEMs, as a result of high proton conductivities under low relative humidity and excellent thermal stability . However, several drawbacks still limit the further application of PBI/PA membranes in HT‐PEMFCs, including the poor solubility of PBI with high molecular weight in organic solvents and the toxicity of 3,3′,4,4′‐tetraaminobiphenyl monomer for PBI synthesis .…”