Abstract Polybenzimidazole (PBI) based high temperature proton exchange membranes were prepared by covalent cross-linking with triglycidylisocyanurate (TGIC) and doping with highly sulfonated polyaniline (SPAN). Insoluble SPAN with high degree of sulfonation was synthesized as the proton conductor. SPAN was homogeneously dispersed in the PBI-TGIC matrix. The composite membranes presented good thermal, dimensional, mechanical and oxidative stability for fuel cell applications. Since TGIC was a tri-functional cross-linker, with a relatively low cross-linking degree (CLD), the mechanical strength, dimensional stability and oxidative resistance of the composite membranes were improved. The low CLD also allowed high doping level of SPAN and consequently high proton conductivity. The proton conductivity of PBI-TGIC(5%)/SPAN(50%) and PBI-TGIC(10%)/SPAN(50%) at 180 °C and 100% RH was 0.13 and 0.12 S cm −1 , respectively. At 180 °C and 50% RH, the proton conductivity of these two PEMs was 0.064 and 0.058 S cm −1 , respectively. At 180 °C and 0% RH, the proton conductivity of them was 0.018 and 0.016 S cm −1 , respectively. The methanol resistance and membrane selectivity of PBI-TGIC/SPAN were also good and thus the membranes could be well applied in direct methanol fuel cells.

中文翻译：

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具有多功能交联剂和高度磺化聚苯胺的聚苯并咪唑基高温质子交换膜的性能增强

摘要 通过与异氰脲酸三缩水甘油酯（TGIC）共价交联，掺杂高度磺化聚苯胺（SPAN）制备聚苯并咪唑（PBI）基高温质子交换膜。合成了高度磺化的不溶性SPAN作为质子导体。SPAN 均匀分散在 PBI-TGIC 基质中。该复合膜在燃料电池应用中表现出良好的热稳定性、尺寸稳定性、机械稳定性和氧化稳定性。由于TGIC是一种三官能交联剂，交联度(CLD)较低，提高了复合膜的机械强度、尺寸稳定性和抗氧化性。低 CLD 还允许 SPAN 的高掺杂水平，从而实现高质子电导率。PBI-TGIC(5%)/SPAN(50%)和PBI-TGIC(10%)/SPAN(50%)在180°C和100% RH下的质子电导率分别为0.13和0.12 S cm -1 。在 180 °C 和 50% RH 下，这两种 PEM 的质子电导率分别为 0.064 和 0.058 S cm -1 。在 180 °C 和 0% RH 下，它们的质子电导率分别为 0.018 和 0.016 S cm -1 。PBI-TGIC/SPAN 的耐甲醇性和膜选择性也很好，因此该膜可以很好地应用于直接甲醇燃料电池。