掺杂纳米SiO_2磺化聚芴醚酮腈质子交换膜的制备及性能研究

Preparation and characterization of SiO_2/sulfonated poly(fluorenyl ether ketone nitrile)composite proton exchange membrane

以正硅酸乙酯和磺化聚芴醚酮腈为原料,采用溶胶-凝胶法合成了纳米SiO_2/磺化聚芴醚酮腈复合质子交换膜,利用扫描电镜对膜的微观形态进行了表征,并考察了SiO_2含量对膜的吸水率、质子传导率、抗氧化性和尺寸稳定性等性能的影响。结果表明,纳米SiO_2能提高膜的质子传导率和抗氧化性能。当SiO_2掺杂量为10%(质量百分数)时,复合膜的质子传导率在80℃时为6.26×10-2(S/cm),在80℃的Fenton's试剂中表现出良好的氧化稳定性。

A novel kind of composite proton exchange membrane using sol-gel method was prepared by doping or- thosilicate into sulfonated poly（fluorenyl ether ketone nitrile）. The morphology of membrane and the dispersion of elements in the cross section of membrane were observed by scanning electron microscope（SEM）. The results showed that the doped nano-SiO2 could improve the proton conductivity and oxidative stability of membrane. The proton conductivity of membrane with 10wt % SiO2 was up to 6.26× 10-2 （S/cm） and it took 124rain before the membrane started to break into small pieces in Fenton＇s reagent （3 H2O2 ＋2ppm FeSO4） at 80℃.