PBI:PVPA (Poly(benzimidazole):poly(vinylphosphonic acid)) polymer electrolyte membranes were fabricated with several molar ratios and number-average molecular weights ($\overline{\mathrm{M}}$_n) of PVPA. Inter-polymer interactions and cross-section morphology of membranes were analyzed using FT-IR and scanning electron microscopy, respectively. Water uptake, proton conductivity, and methanol permeability of the membranes were characterized at several operating conditions. In addition, the influence of doping level of phosphoric acid (H₃PO₄) on the membranes proton conductivity was investigated. The membranes proton conductivities were enhanced with PVPA molar ratio and $\overline{\mathrm{M}}$_n. The highest proton conductivity at 150 °C, 79.6 mS.cm⁻¹, was obtained for H₃PO₄-doped PBI:PVPA membrane containing PVPA with $\overline{\mathrm{M}}$_n of 42,000 g.mol⁻¹, PBI:PVPA molar ratio of 1:1 and H₃PO₄ doping level of 15.2. Proton hopping between PBI and PVPA was found to be the most dominant proton transport mechanism through the PBI:PVPA membranes, especially at anhydrous state. Finally, the results suggest that these membranes are promising candidates for high-temperature proton exchange membrane fuel cell applications.

制备具有几个摩尔比和数均分子量的PBI：PVPA（聚（苯并咪唑）：聚（乙烯基膦酸））聚合物电解质膜$\overline{\mathrm{中号}}$_n）PVPA。分别使用FT-IR和扫描电子显微镜分析了膜间的聚合物相互作用和膜的横截面形态。在几种操作条件下表征了膜的吸水率，质子传导率和甲醇渗透率。此外，研究了磷酸（H ₃ PO ₄）的掺杂水平对膜质子电导率的影响。膜质子电导率随PVPA摩尔比的增加而增大。$\overline{\mathrm{中号}}$_n。对于含PVPA的H ₃ PO ₄掺杂的PBI：PVPA膜，在150°C时可获得最高的质子传导率79.6 mS.cm ^-1。$\overline{\mathrm{中号}}$_n为42,000 g.mol ^-1，PBI：PVPA摩尔比为1：1，H ₃ PO ₄掺杂水平为15.2。发现PBI和PVPA之间的质子跳跃是通过PBI：PVPA膜的最主要的质子传输机制，尤其是在无水状态下。最后，结果表明这些膜是高温质子交换膜燃料电池应用的有前途的候选者。