Effect of Fluorene Groups on the Properties of Multiblock Poly(arylene ether sulfone)s-Based Anion-Exchange Membranes
Effect of Fluorene Groups on the Properties of Multiblock Poly(arylene ether sulfone)s-Based Anion-Exchange Membranes
复制标题
芴基对多嵌段聚亚芳基醚砜阴离子交换膜性能的影响
DOI：
10.1021/am5017599
复制
发表时间：
2014-05-14
影响因子：
9.5
通讯作者：
Liu, Qing Lin
中科院分区：
文献类型：
--
作者：
Xu, Pei Yu;Zhou, Ke;Liu, Qing Lin
以遥爪低聚物为原料，通过嵌段共缩聚反应合成了两种新型多嵌段聚芳醚砜，并将其用于阴离子交换膜的制备。所合成的共聚物具有极其相似的主链。不同之处在于，一种的苄基甲基位于芴砜片段上，而另一种的苄基甲基位于异亚丙基砜片段上。苄基甲基部分充当阳离子位点的前体，并使用N-溴代琥珀酰亚胺（NBS）溴化，然后用N，N，N '，N'-四甲基-1，6-二氨基己烷（TMHDA）季铵化。在含苄基甲基的芴-砜链段和异亚丙基-砜链段的特定位置处可以实现受控的溴化和季铵化。采用核磁共振氢谱、傅里叶变换红外光谱和凝胶渗透色谱对合成的共聚物进行了表征。用小角X射线散射和透射电子显微镜观察到在所制备的AEMs中存在明显的微相分离。含芴砜链段的AEM（IEC = 1.89 meq center dot g（-1））比含异亚丙基砜链段的AEM（IEC = 2.03 meq center dot g（-1））显示出更高的离子电导率和甲醇渗透性。此外，前者表现出更好的碱性稳定性比后者。
Two kinds of novel multiblock poly(arylene ether sulfone)s were synthesized via block copolycondensation of telechelic oligomers as a starting material for the preparation of anion-exchange membranes (AEMs). The as-synthesized copolymers have extremely similar main chains. The difference is that the benzylmethyl groups for one are located on the fluorene-sulfone segments and they are located on the isopropylidene-sulfone segments for the other. The benzylmethyl moieties served as precursors to cationic sites and were brominated using N-bromosuccinimide (NBS) and then quaternized with N,N,N',N'-tetramethyl-1,6-diaminohexane (TMHDA). Controlled bromination and quaternization at specific positions of the benzylmethy-containing fluorene-sulfone segments and isopropylidene-sulfone segments can be achieved. H-1 NMR spectroscopy, Fourier transform infrared spectroscopy, and gel permeation chromatography were used to characterize the as-synthesized copolymers. Distinct microphase separation in the as-prepared AEMs was observed using small-angle X-ray scattering and transmission electron microscopy. The AEM containing fluorene-sulfone segments (IEC = 1.89 meq center dot g(-1)) showed higher ionic conductivity and methanol permeability than that containing isopropylidene-sulfone segments (IEC = 2.03 meq center dot g(-1)). Moreover, the former showed better alkaline stability than the latter.