An insoluble sulfonated polyphosphazene (SPOP) with high degree of sulfonation is synthesized and used as the proton conductor in polybenzimidazole (PBI) high-temperature proton exchange membrane. Polyfunctional triglycidyl isocyanurate (TGIC) is used as covalent cross-linking agent to obtain a high proton conductivity at low cross-linking degrees. The composite membrane is characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD). SPOP has good compatibility with mPBI-TGIC, leading to uniform dispersion in the obtained membranes with neither phase separation nor agglomeration. As a highly efficient cross-linking agent, TGIC not only makes the composite membrane have good mechanical properties, thermal stability, anti-swelling and anti-oxidation properties at low cross-linking degrees, but also leads to high doping amount of SPOP, thus making the composite the membrane have a high proton conductivity. The conductivity of mPBI-TGIC(5%)/SPOP(50%) at 100% RH, 50% RH and 0 RH is 0.143, 0.076 and 0.044 S cm−1 at 180 °C, respectively. In addition, the composite membranes has good methanol resistance and selectivity, so the composite membrane can be applied in the direct methanol fuel cell.

中文翻译：

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高磺化聚磷腈共价交联聚苯并咪唑高温质子交换膜的制备及性能

合成了一种高度磺化的不溶性磺化聚磷腈（SPOP），用作聚苯并咪唑（PBI）高温质子交换膜中的质子导体。多官能异氰脲酸三缩水甘油酯 (TGIC) 用作共价交联剂，以在低交联度下获得高质子传导性。该复合膜通过傅里叶变换红外（FT-IR）光谱、扫描电子显微镜（SEM）、能量色散X射线（EDX）和X射线衍射（XRD）表征。SPOP与mPBI-TGIC具有良好的相容性，在所得膜中分散均匀，无相分离，无团聚。作为一种高效的交联剂，TGIC不仅使复合膜具有良好的机械性能、热稳定性、低交联度下的抗溶胀和抗氧化性能，但也导致高掺杂量的SPOP，从而使复合膜具有高质子传导性。mPBI-TGIC(5%)/SPOP(50%) 在 100% RH、50% RH 和 0 RH 下的电导率在 180 °C 下分别为 0.143、0.076 和 0.044 S cm-1。此外，该复合膜具有良好的耐甲醇性和选择性，可应用于直接甲醇燃料电池。