Polymer Electrolyte Membranes Based on Poly(phenylene ether)s with Pendant Perfluoroalkyl Sulfonic Acids
Polymer Electrolyte Membranes Based on Poly(phenylene ether)s with Pendant Perfluoroalkyl Sulfonic Acids
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DOI：
10.1021/ma102813y
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发表时间：
2011-02
期刊：
影响因子：
5.5
通讯作者：
Kazuhiro Nakabayashi;Tomoya Higashihara;M. Ueda
中科院分区：
文献类型：
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作者：
Kazuhiro Nakabayashi;Tomoya Higashihara;M. Ueda
以全氟单体（十氟联苯或六氟苯）与2,5-二（4′-碘苯基）对苯二酚为原料，通过芳香族亲核取代反应，与1,1,2,2-四氟-2-（1,1,2,2-四氟-2-碘乙氧基）乙磺酸钾进行Ullman偶联反应，合成了离子交换容量为1.17 ~ 1.83 mequiv/g的含全氟烷基磺酸的聚（苯基）醚。溶液铸造法制备的膜对热芬顿试剂具有较高的氧化稳定性。即使在水合状态下，由于氟含量高，膜的吸水性也很低（19.3 - 28.0 wt %）。在高相对湿度（95% RH）下，所有膜都观察到高质子电导率（~ 1.0 × 10−1 S/cm）。此外，当IEC = 1.83 mequiv/g时，即使在低相对湿度（30% RH）下，膜仍保持3.3 × 10−3 S/cm的高质子电导率，与Nafion 117膜（4.1 × 10−3 S/cm）相当。这个质子。
Poly(phenylene ether)s containing pendant perfluoroalkyl sulfonic acids with ion exchange capacity (IEC) of 1.17−1.83 mequiv/g were synthesized by the aromatic nucleophilic substitution reaction of a perfluoromonomer (decafluorobiphenyl or hexafluorobenzene) with 2,5-bis(4′-iodophenyl)hydroquinone, followed by the Ullman coupling reaction with potassium 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-2-iodoethoxy)ethanesulfonate. The membranes prepared by solution casting showed high oxidative stability against hot Fenton’s reagent. Even in the hydrated state, water uptake of the membranes was significantly low (19.3−28.0 wt %) due to the high fluorine content. High proton conductivity (∼1.0 × 10−1 S/cm) was observed in all membranes under high relative humidity (95% RH). Furthermore, the membrane with IEC = 1.83 mequiv/g still maintained high proton conductivity of 3.3 × 10−3 S/cm even under low relative humidity (30% RH), which was comparable to that of the Nafion 117 membrane (4.1 × 10−3 S/cm). This proton ...