燃料電池質子交換膜用磺化聚醚碸之製備與性質研究

Abstract

在本研究中，藉由苯硼酸利用鈴木偶合反應在4,4´-二氟二苯碸上接枝含有苯環側鏈的新單體，接著在利用此新單體磺酸化後合成出新的側鏈磺酸化單體。 磺酸化單體利用親核性芳香取代反應合成出具有主鏈磺酸根之磺化聚醚碸與側鏈磺酸根之磺化聚醚碸P2。 藉由此二高分子可以製備出質子交換膜，且帶有側鏈的磺化聚醚碸在70°C時有57-183 mS/cm的高質子傳導度表現。 側鏈磺化聚醚碸在阻擋甲醇滲透方面的表現（0.35-1.368 cm2/s）也來的比Nafion好（1.45 cm2/s）。 綜合全部的數據指出，側鏈磺化聚醚碸表現出優異的電池效能，側鏈磺化聚醚碸於直接甲醇燃料電池的使用上也擁有相當高的潛力。

In this studies,novel monomers containing two phenyl groups has been synthesized by bromination of bis（4-fluorophenyl） sulfone, via Suzuki coupling with benzeneboronic acid. The resulting monomers were converted to the corresponding sulfonated monomers having two pendent sulfonic acid groups. Aromatic nucleophilic substitution （SNAr） polycondensation using the disulfonated monomers provided sulfonated poly（arylene ether sulfone） polymers P1 and P2. Flexible and tough membranes having high mechanical strength were obtained by solution casting of all two series of polymers. The polymers with two pendent sulfonic acid groups had high proton conductivities in the range of 57-183 mS/cm for P2-xx at 70°C, respectively. The methanol permeabilities of these polymers were in the range of （0.35-1.368 cm2/s）, which is lower than Nafion （1.45 cm2/s）. In proton exchange membrane fuel cell test, P2-70 membranes showed the good cell performance. This study suggests that the P2 membranes also have high potential for direct methanol fuel cell application.