高质子传导率及尺寸稳定性复合质子交换膜制备及性能研究

Preparation and properties of composite proton exchange membranes with high proton conductivity and dimensional stability

通过2⁃丙烯酰胺⁃2⁃甲基丙磺酸(AMPS)在1种具有多孔结构的金属有机骨架(MOF)UiO⁃66⁃NH_(2)中聚合,获得UiO⁃66⁃NH_(2)/PAMPS杂化填料后将其加入磺化聚醚醚酮(SPEEK)中制备纳米复合质子交换膜,并对纳米填料和膜性能进行了测试和表征。其中,UiO⁃66⁃NH_(2)/PAMPS中MOF组分的有序孔洞能够为质子提供较为快速的传输通道,同时PAMPS组分上的磺酸基团则为这些通道提供了额外的质子传输位点,从而促进了复合膜中的质子传导。结果表明,填料与基体之间的强静电相互作用使复合膜的溶胀率有所下降;当填料含量达到6%(质量分数,下同)时,复合膜的质子电导率(σ)从0.040 S/cm提升到0.057 S/cm,比纯SPEEK高42.5%,而溶胀率由29%下降到23%。

A UiO⁃66⁃NH_(2)/PAMPS hybrid filler was prepared through the in⁃situ polymerization of 2⁃acrylamide⁃2⁃methyl⁃propanesulfonic acid in a porous metal organic framework(UiO⁃66⁃NH_(2)).The resultant filler was then added to the sulfonated poly(ether ether ketone)(SPEEK)to fabricate nanocomposite membranes.The properties of the nanofillers and membranes were investigated.The ordered pore networks of metal organic framework components in UiO⁃66⁃NH_(2)/PAMPS provided fast proton diffusion pathways,and the sulfonic acid groups in PAMPS offered additional sites for proton transfer.This resulted in a significant improvement in proton conductivity of the nanocomposite membranes.The experimental results indicated that there is a strong electrostatic interaction between the filler and matrix,preventing the swelling of the nanocomposite membranes.When the filler content was 6 wt%,the proton conductivity of the nanocomposite membrane containing 6 wt%filler increased from 0.040 S/cm to 0.057 S/cm in water,which was 42.5%higher than that of SPEEK as a control.Its swelling ratio decreased from 29%to 23%.