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High conductivity and alkali-resistant stability of imidazole side chain crosslinked anion exchange membrane
Polymer ( IF 4.1 ) Pub Date : 2020-09-29 , DOI: 10.1016/j.polymer.2020.123085
Kai Yang , Hongzhe Ni , Tianen Shui , Xiaoyu Chi , Wenbo Chen , Qian Liu , Jingmei Xu , Zhe Wang

Poly (aryl ether ketone) polymers (PAEKS) were synthesized by polycondensation of trimethyl hydroquinone, allyl bisphenol S and 4,4-difluorodiphenyl ketone as monomers. A series of uncrosslinked and crosslinked anion exchange membranes (AEMs) with diverse contents of 1-allyl-3-methylimidazolium chloride and 1-vinylimidazole were prepared by grafting and bromination reaction. The 1-vinylimidazole in the AEMs was simultaneously present as a crosslinked agent. 1HNMR and FT-IR spectra demonstrated the structure of the above PAEKS and AEMs, respectively. TEM images and SAXS profiles showed the formation of distinct hydrophilic/hydrophobic microphase separation in the TCImP membranes, which offered vast of channels for ion transmission. Among them, TCImP-3 membrane showed the highest hydroxide conductivity of 0.144 S/cm at 80 °C. Compared with the uncrosslinked AEMs, the crosslinked AEMs exhibited slightly lower water uptake and swelling ratio. The crosslinked structures in the AEMs were helpful to improve the mechanical property and alkali-resistant stability of AEMs. The hydroxide conductivity of the TCImP-3 membrane kept 0.117 S/cm in 2 M NaOH solutions at 80 °C for 400 h. Meanwhile, crosslinked AEMs showed excellent thermostability. We believe that TCImP membranes are a promising AEMs material.



中文翻译:

咪唑侧链交联阴离子交换膜的高电导率和耐碱稳定性

通过三甲基对苯二酚,烯丙基双酚S和4,4-二氟二苯基酮作为单体的缩聚反应,合成了聚(芳基醚酮)聚合物(PAEKS)。通过接枝和溴化反应制备了一系列具有不同含量的1-烯丙基-3-甲基咪唑氯化物和1-乙烯基咪唑的未交联和交联的阴离子交换膜(AEM)。AEM中的1-乙烯基咪唑同时作为交联剂存在。1个HNMR和FT-IR光谱分别证明了上述PAEKS和AEM的结构。TEM图像和SAXS曲线显示TCImP膜中形成了明显的亲水/疏水微相分离,这为离子传输提供了广阔的通道。其中,TCImP-3膜在80°C下具有最高的氢氧化物电导率0.144 S / cm。与未交联的AEM相比,交联的AEM的吸水率和溶胀率略低。AEM中的交联结构有助于提高AEM的机械性能和耐碱稳定性。TCImP-3膜的氢氧化物电导率在80°C下的2 M NaOH溶液中保持0.117 S / cm 400 h。同时,交联的AEM显示出优异的热稳定性。我们认为,TCImP膜是一种很有前途的AEMs材料。

更新日期:2020-10-05
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