Design of pendent imidazolium side chain with flexible ether-containing spacer for alkaline anion exchange membrane
Design of pendent imidazolium side chain with flexible ether-containing spacer for alkaline anion exchange membrane
复制标题
带有柔性含醚间隔基的悬垂咪唑侧链碱性阴离子交换膜的设计
DOI：
10.1016/j.memsci.2016.09.050
复制
发表时间：
2017-02-01
影响因子：
9.5
通讯作者：
He, Gaohong
中科院分区：
文献类型：
--
作者：
Gong, Xue;Yan, Xiaoming;He, Gaohong
通过氯甲基化聚砜与羟基咪唑盐的威廉姆森醚化反应，设计了一种新型的咪唑侧链与柔性含醚间隔基的阴离子交换膜。长的柔性含醚间隔链的引入增强了封端的咪唑基团的流动性和离子相互作用。小角X射线散射峰证实了这种结构有利于形成良好的亲水/疏水微相分离结构。结果，该膜表现出高电导率和优异的抗溶胀能力。IEC为1.55 mmol g（-1）的膜显示出相当大的氢氧化物电导率（72 mS cm（-1），60 ° C）、低溶胀比（7.3%，60 ° C）和在水合状态下的大拉伸强度（43.4 MPa，20 ° C）。长间隔链的存在也提高了碱稳定性。在60 ℃、1 M KOH溶液中浸泡168 h后，膜的氢氧化物电导率和拉伸强度保持恒定。在这项工作中制造的含醚侧链提供了一个普遍的有前途的方法来平衡氢氧化物的导电性和尺寸和碱性稳定性。
A novel approach is proposed to design anion exchange membranes (AEMs) containing pendent imidazolium side chains with flexible ether-containing spacer by the Williamson etherification between chloromethylated polysulfone and as-synthesized hydroxyl-bearing imidazolium. The introduction of long flexible ether-containing spacer chains enhances the mobility of terminated imidazolium groups and ion interactions. It facilitates the formation of a good hydrophilic/hydrophobic micro-phase separation structure, which is confirmed by the scattering peak of SAXS. As a result, the membranes exhibit high conductivity and excellent anti-swelling ability. The membrane with IEC of 1.55 mmol g(-1) shows considerable hydroxide conductivity (72 mS cm(-1), 60 degrees C), low swelling ratio (7.3%, 60 degrees C), and great tensile strength in hydrated state (43.4 MPa, 20 degrees C). The existence of long spacer chain also improved the alkaline stability. After immersion in 60 degrees C, 1 M KOH solution for 168 h, hydroxide conductivity and tensile strength of the membrane remain constant. The ether-containing side chains fabricated in this work provides a universal promising method to balance hydroxide conductivity and dimensional and alkaline stability.