Abstract Poly(2,5-benzimidazole), commonly known as ABPBI, is an excellent thermo-chemically stable polymer that is widely evaluated as a proton exchange membrane material in a fuel cell. Its niche intrinsic characteristics could be highly useful in the membrane preparation for various separation applications, especially under harsher environments. To gain insights towards this feasibility, ABPBI based supported membranes were prepared by phase inversion method. Effects of the nonwoven porous support material (polypropylene/polyester), non-solvent (water/0.5 N NaOH) and polymer concentration (6 or 4 wt%) on the membrane properties (water flux, rejection and porosity) were investigated. The stability of these membranes towards common organic solvents, concentrated acid (25 N H2SO4), base (2.5 N NaOH) and an autoclave condition was analyzed. ABPBI membrane showed a pore collapse after drying. In order to avoid this, the glycerol treatment was not only found to be suitable but also repeatable, without significant deviations in the water flux.

中文翻译：

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基于溶剂和 pH 稳定的聚（2,5-苯并咪唑）（ABPBI）超滤膜：制备和表征

摘要 聚(2,5-苯并咪唑)，俗称ABPBI，是一种优良的热化学稳定性聚合物，被广泛评价为燃料电池中的质子交换膜材料。它的利基固有特性在各种分离应用的膜制备中非常有用，尤其是在更恶劣的环境下。为了深入了解这种可行性，通过相转化法制备了基于 ABPBI 的支撑膜。研究了无纺多孔载体材料（聚丙烯/聚酯）、非溶剂（水/0.5 N NaOH）和聚合物浓度（6 或 4 wt%）对膜特性（水通量、截留率和孔隙率）的影响。分析了这些膜对常见有机溶剂、浓酸 (25 N H2SO4)、碱 (2.5 N NaOH) 和高压釜条件的稳定性。ABPBI 膜在干燥后表现出孔隙塌陷。为了避免这种情况，发现甘油处理不仅合适而且可重复，水通量没有显着偏差。