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

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0.039 S/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.

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

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.