侧链含有全氟磺酸的聚芳醚砜质子交换膜材料的制备及性能

Synthesis and Properties of Poly(aryl ether sulfones) Functionalized with Pendant Perfluoroalkyl Sulfonic Acid for Proton Exchange Membrane

利用含溴苯侧基的聚芳醚砜(PES-Br)和1,1,2,2-四氟-2-(1,1,2,2-四氟-2-碘乙氧基)乙烷磺酸钾(PSA-K)进行Ullman偶联反应,制备了新型含全氟磺酸侧链的聚芳醚砜(PES-PSA),全氟磺酸的引入量为50%.在离子交换容量(IEC)为0.907 meq./g,80℃,相对湿度为100%时,PES-PSA质子传导率达到0.039S/cm,表现出较高的质子传导能力.其较低的IEC值使膜材料表现出良好的热稳定性和尺寸稳定性.

A novel poly（arylene ether sulfone） with a perfluoroalkyl sulfonic acid pendant（PES-PSA） was synthesized by Ullman coupling of poly{oxy-4,4′-[2-（4′-bromophenyl ene）biphenylene]oxy-4,4′-diphenylsulfone}（PES-Br） and potassium 1,1,2,2-tetrafluoro-2-（1,1,2,2-tetrafluoro-2-iodo-ethoxy）ethanesulfonate（PSA-K）.The introduction of the perfluoroalkyl sulfonic acids was successfully carried out with high conversion（c.a.50%） to yield the desired polymer.Even with a low ion exchange capacity（IEC） of 0.907 meq./g,PES-PSA exhibited a high proton conductivity of 0.039 S/cm at 80 ℃ under 100% relative humidity.The low IEC makes the membrane own good dimensional stability and thermal stability.Other membrane properties,such as thermal properties and water uptake were also investigated in detail.