Poly(arylene ether) ionomers containing sulfofluorenyl groups for fuel cell applications
Poly(arylene ether) ionomers containing sulfofluorenyl groups for fuel cell applications
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DOI：
10.1021/ma050856u
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发表时间：
2005-08-09
期刊：
影响因子：
5.5
通讯作者：
Watanabe, M
中科院分区：
文献类型：
--
作者：
Chikashige, Y;Chikyu, Y;Watanabe, M
合成了一系列新型含芴磺基的聚芳醚离聚物，用于聚合物电解质燃料电池（PEFC）。用磺酸基团区域选择性地取代母体聚醚，得到离子交换容量达2.0 mequiv/g的离聚物。离聚物2a（均聚物）和2b（共聚物）通过从溶液流延得到坚韧、柔性、延展性和透明的膜。热稳定性与分解温度约。对于离聚物，确认了250 ℃和无玻璃化转变温度。如在热芬顿试剂中或在140 ℃和100%相对湿度的气氛中的加速测试中所证实的，2a的膜（离子交换容量（IEC）= 1.80 mequiv/g）显示出突出的氧化和水解稳定性。2a的膜（IEC = 1.63 mequiv/g）表现出比Nafion 117更好的机械性能（更低的伸长率和更高的强度）。2a的完全水合膜（IEC = 1.14 meq/g）在140 ℃下显示出最高的质子传导率（0.2 S cm（-1））。质子传导率可持续1300 h以上。较低的气体（H-2和O-2）渗透被证实为2a，而不是Nafion。所有这些性能的离聚物2是有前途的高温PEFC的电解质膜。
A new series of poly(arylene ether) ionomers containing sulfofluorenyl groups has been synthesized for the applications to polymer electrolyte fuel cells (PEFCs). The parent polyethers were regioselectively substituted with sulfonic acid groups to give the ionomers with the ion exchange capacity up to 2.0 mequiv/g. The ionomers 2a (homopolymer) and 2b (copolymer) gave a tough, flexible, ductile, and transparent membrane by casting from the solution. Thermal stability with decomposition temperature of ca. 250 degrees C and no glass transition temperature was confirmed for the ionomers. The membrane of 2a (ion-exchange capacity (IEC) = 1.80 mequiv/g) showed outstanding stability to oxidation and hydrolysis as confirmed in the accelerated testing in hot Fenton's reagent or in the atmosphere at 140 degrees C and 100% relative humidity. The membrane of 2a (IEC = 1.63 mequiv/g) exhibited better mechanical properties (lower elongation and higher strength) than those of Nafion 117. The fully hydrated membrane of 2a (IEC = 1.14 meq/g) showed the highest proton conductivity (0.2 S cm(-1)) at 140 degrees C. The proton conductivity was durable over 1300 h. Lower gas (H-2 and O-2) permeation was confirmed for 2a rather than for Nafion. All those properties of the ionomers 2 are promising as an electrolyte membrane for high-temperature PEFCs.