A series of novel sulfonated poly(arylene ether phosphine oxide)s containing diphenyl ether (sPEPO) with various sulfonation degrees were synthesized using direct polycondensation. The transparent, tough and flexible membranes could be obtained by casting. The macroscopic properties and microstructure of the obtained membranes were studied in detail. The results showed that these sPEPO membranes with appropriate sulfonation degree displayed excellent properties in terms of proton conductivity and dimensional stability. For example, sPEPO-80 exhibited a proton conductivity of 0.092 S cm−1, which is higher than that of Nafion 117 (0.088 S cm−1) at 80 °C, whereas a swelling of 21.1% at 80 °C is comparable to that 20.1% of Nafion 117. In addition, it took 60 h to dissolve completely in Fenton’s reagent at 25 °C, which presented remarkable oxidation stability. Therefore, the achieved sPEPO-80 membrane has an excellent application prospect.

中文翻译：

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具有二苯醚部分作为质子交换膜的新型磺化聚（亚芳基醚氧化膦）的合成和表征

使用直接缩聚反应合成了一系列不同磺化度的含二苯醚（sPEPO）的新型磺化聚（亚芳基醚氧化膦）。透明、坚韧和柔韧的膜可以通过浇铸获得。详细研究了所得膜的宏观性能和微观结构。结果表明，这些具有适当磺化度的 sPEPO 膜在质子传导性和尺寸稳定性方面表现出优异的性能。例如，sPEPO-80 的质子传导率为 0.092 S cm-1，高于 Nafion 117 (0.088 S cm-1) 在 80 °C 下的质子传导率，而在 80 °C 下膨胀 21.1% 与Nafion 117 的 20.1%。此外，在 25°C 下完全溶解在芬顿试剂中需要 60 小时，表现出显着的氧化稳定性。因此，所获得的sPEPO-80膜具有很好的应用前景。