Fully Aromatic Ionomers with Precisely Sequenced Sulfonated Moieties for Enhanced Proton Conductivity
作者:Xue-Feng Li、François P. V. Paoloni、E. Annika Weiber、Zhen-Hua Jiang、Patric Jannasch
DOI:10.1021/ma201599p
日期:2012.2.14
synthetic strategies based on Ullmann ether reactions and a Baeyer–Villiger rearrangement were devised to obtain bisphenol monomers with four or six phenylene units linked exclusively by ether bridges to avoid transetherification reactions. Polycondensations of these bisphenol monomers with mono- or disulfonated dihalide monomers gave high molecular weight poly(arylene ether), poly(arylene ether sulfone)
已经设计,制备了一系列六种完全芳族离聚物,沿着聚合物链具有精确排列的磺化位点,并将其表征为质子交换膜。设计了两种基于Ullmann醚反应和Baeyer-Villiger重排的简单有效的合成策略,以得到仅通过醚桥连接的具有四个或六个亚苯基单元的双酚单体,以避免发生跨醚化反应。这些双酚单体与单或二磺化二卤化物单体的缩聚得到高分子量的聚(亚芳基醚),聚(亚芳基醚砜)和具有微嵌段状结构的聚(亚芳基醚酮)均聚物,其磺化部分被单分散的非磺化低聚物隔开(醚)垫片。溶剂流延膜的纳米级形态和性能与低聚(醚)间隔基的性质密切相关。小角度X射线散射(SAXS)测量表明,对于带有六环间隔基的聚合物,其散射强度很高,离聚物峰非常窄,具有二阶特征。这清楚地表明,相对于具有磺酸酯基团统计分布的相应芳族离聚物而言,受控的离子测序使离子聚集体的自组装具有更高的组织度。在相同的离子含量下,离聚物包含 这清楚地表明,相对于具有