A novel tetraamine, 4,4’-oxy-bis[4-(trifluoromethyl)-1,2-benzendiamine] (7), was synthesized through a seven-step synthetic procedure starting from 1-chloro-4-nitro-2-(trifluoromethyl)benzene (1). Polybenzimidazole CF₃-PBI-OO was prepared from 4,4’-oxybis(benzoic acid) (OBA) and tetraamine (7) using Eaton’s reagent as the solvent. To achieve a relatively high molecular weight, the temperature and concentration should be well controlled. CF₃-PBI-OO exhibited a high inherent viscosity of 2.1 dL/g, measured in methanesulfonic acid (MSA) with a concentration of 0.2 g/dL at 35 ℃. We provide a relatively fast method to fabricate membranes by dissolving them in MSA. CF₃-PBI-OO also required less time (2.7 h) to achieve a saturated PA uptake (271%), when immersed in a 75% phosphoric acid solution at room temperature. CF₃-PBI-OO membrane with a PA uptake of 213% demonstrated the optimal combination of properties. The membrane exhibited a high proton conductivity of 115 mS/cm at 160 ℃. The single fuel cell based on CF₃-PBI-OO demonstrated a peak power density of 691 mW/cm² at 160 ℃. It showed superior performance compared to commercially available m-PBI when subjected to the same test conditions.

一种新型四胺，4,4'-氧基-双[4-(三氟甲基)-1,2-苯二胺] (7)，是通过七步合成程序从 1-氯-4-硝基-2- 开始合成的。 (三氟甲基)苯(1)。聚苯并咪唑 CF ₃ -PBI-OO 以 4,4'-氧双（苯甲酸）（OBA）和四胺（7）为原料，以伊顿试剂为溶剂制备。要获得较高的分子量，应控制好温度和浓度。 CF ₃ -PBI-OO 在 35 ℃、浓度为 0.2 g/dL 的甲磺酸 (MSA) 中测量，表现出 2.1 dL/g 的高比浓对数粘度。我们提供了一种相对快速的方法，通过将膜溶解在 MSA 中来制造膜。当在室温下浸入 75% 磷酸溶液中时，CF ₃ -PBI-OO 也需要更短的时间（2.7 小时）来实现饱和 PA 吸收（271%）。 PA 吸收率为 213% 的 CF ₃ -PBI-OO 膜表现出最佳的性能组合。该膜在160 ℃时表现出115 mS/cm的高质子电导率。基于CF ₃ -PBI-OO的单体燃料电池在160 ℃时表现出691 mW/cm ² 的峰值功率密度。在相同的测试条件下，与市售的 m-PBI 相比，它表现出优越的性能。