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Constructing micro-phase separation structure by multi-arm side chains to improve the property of anion exchange membrane
International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2020-05-23 , DOI: 10.1016/j.ijhydene.2020.04.264
Xinming Du , Zhe Wang , Hongyu Zhang , Wenchang Liu , Jingmei Xu

In order to improve the performance of anion exchange membrane (AEMs) as the core component of alkaline fuel cell, a novel pentamethyl-contained phenolphthalein multi-arm monomer is synthesized. The highly imidazolium-functionalized poly (arylene ether ketone) membrane (Im-PEK-x) are prepared by introducing 1,2-dimethylimidazole as hydrophilic segments. The monomer, polymer and anion exchange membranes are confirmed by 1H NMR spectra. The well-defined micro-phase separated structure of membranes is conducive to ion transport and the structure is investigated by TEM and SAXS. The imidazolium-functionalized membranes (Im-PEK-0.8) exhibits high ionic conductivity (0.148 S/cm at 80 °C). The tensile strength of Im-PEK-0.8 membrane is 30.06 MPa. Furthermore, after immersing in 60 °C, 2 M NaOH solution for 240 h, the ionic conductivity remains 0.092 S/cm for Im-PEK-0.8. The 1,2-dimethylimidazole enhance alkaline stability by steric effect of the substituent group at the C2 position. All these results indicate that this is a new method to enhance conductivity and stability performance of AEMs.



中文翻译:

利用多臂侧链构建微相分离结构以提高阴离子交换膜的性能

为了提高阴离子交换膜(AEMs)作为碱性燃料电池的核心组件的性能,合成了一种新型的五甲基酚酞多臂单体。通过引入1,2-二甲基咪唑作为亲水链段,可以制备高度咪唑鎓官能化的聚(亚芳基醚酮)膜(Im-PEK-x)。单体,聚合物和阴离子交换膜的确认为11 H NMR谱。明确定义的微相分离膜结构有利于离子迁移,并通过TEM和SAXS研究了该结构。咪唑鎓官能化膜(Im-PEK-0.8)表现出高离子电导率(80°C时为0.148 S / cm)。Im-PEK-0.8膜的拉伸强度为30.06 MPa。此外,在60°C的2 M NaOH溶液中浸泡240小时后,Im-PEK-0.8的离子电导率仍为0.092 S / cm。1,2-二甲基咪唑通过C 2位置上的取代基的空间效应来增强碱稳定性。所有这些结果表明,这是一种增强AEM导电性和稳定性能的新方法。

更新日期:2020-06-30
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