A series of poly(arylene ether sulfone) block copolymer ionomers have been synthesized through pre-polycondensation, block copolycondensation, bromomethylation and the Menshutkin reaction, where benzyl-quaternary ammonium groups are tethered to the side chains of hydrophilic blocks. Atomic force microscopy (AFM) results indicate the formation of a well-defined microphase-separated morphology in ionomer-based membranes, which is attributed to its well-controlled block copolymer as well as aromatic side-chain structures. The prepared side-chain block anion exchange membranes (bQPAES) with IECs of 0.79–1.15 mequiv g⁻¹ have isotropic membrane swelling and high hydroxide conductivity (54.8–86.3 mS cm⁻¹). Compared to random copolymer ionomer membranes, the present block anion exchange membranes exhibit acceptable high hydroxide conductivity, which is ascribed to well-connected ionic nano-channels resulting from the better microphase separation induced by block copolymer structures. Besides this, the side-chain block bQPAES membranes display reasonably high alkaline stability with good chemical stability of both quaternary ammonium ionic groups and block copolymer backbones considering the harsh aging conditions (4 M NaOH at 80 °C).

中文翻译：

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束缚芳香族侧链季铵盐作为阴离子交换膜的嵌段聚（亚芳基醚砜）共聚物†

通过预缩聚，嵌段共缩聚，溴甲基化和Menshutkin反应合成了一系列的聚（亚芳基醚砜）嵌段共聚物离聚物，其中苄基-季铵基团被束缚在亲水性嵌段的侧链上。原子力显微镜（AFM）结果表明在离聚物基膜中形成了明确定义的微相分离形态，这归因于其良好控制的嵌段共聚物以及芳族侧链结构。制备的IEC为0.79–1.15 mequiv g ^-1的侧链嵌段阴离子交换膜（bQPAES）具有各向同性的膜溶胀和高氢氧化物传导性（54.8–86.3 mS cm ^-1）。与无规共聚物离聚物膜相比，本发明的嵌段阴离子交换膜表现出可接受的高氢氧化物电导率，这归因于由嵌段共聚物结构引起的更好的微相分离而导致的良好连接的离子纳米通道。除此之外，考虑到苛刻的老化条件（在80°C下使用4 M NaOH），侧链嵌段bQPAES膜还显示出相当高的碱稳定性，季铵离子基团和嵌段共聚物主链的化学稳定性都很好。