Abstract Poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS) triblock copolymers are prepared with 50% hexyl quaternary ammonium (HQA) and 20% alkyl chains of different chain lengths: C4 (50HQA-20C4-SEBS) and C12 (50HQA-20C12-SEBS). Their physicochemical and electrical properties are investigated for use as novel alkaline anion exchange membranes. In most other comb-type polymers, the alkyl chain is introduced as a hydrophilic spacer unit between the polymer backbone and conducting head group. In the current study, additional alkyl chains are grafted onto the SEBS polymer as hydrophobic side chains as well as typical hydrophilic side chains. Introduction of this extra hydrophobic alkyl spacer group is done to obtain well-connected morphology, increased free volume, enhanced water uptake and related conductivity, together with improved physicochemical properties of the membranes obtained. The results are compared with HQA-functionalized SEBS without the hydrophobic alkyl spacer group (50HQA-20C0-SEBS), and the effects of the alkyl chain lengths on the structure of polymers and physicochemical properties of the corresponding membranes are investigated.

中文翻译：

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用于高性能阴离子交换膜的疏水-亲水梳型季铵官能化 SEBS 共聚物

摘要 采用 50% 己基季铵 (HQA) 和 20% 不同链长的烷基链制备聚（苯乙烯-b-乙烯-共-丁烯-b-苯乙烯）（SEBS）三嵌段共聚物：C4 (50HQA-20C4-SEBS) ) 和 C12 (50HQA-20C12-SEBS)。研究了它们的物理化学和电学特性，以用作新型碱性阴离子交换膜。在大多数其他梳型聚合物中，烷基链作为聚合物骨架和导电头基之间的亲水间隔单元引入。在目前的研究中，额外的烷基链作为疏水侧链和典型的亲水侧链接枝到 SEBS 聚合物上。引入这种额外的疏水性烷基间隔基团是为了获得连接良好的形态、增加的自由体积、增强的吸水率和相关的电导率，以及获得的膜的改善的物理化学性质。将结果与不含疏水性烷基间隔基团的 HQA 功能化 SEBS (50HQA-20C0-SEBS) 进行比较，并研究了烷基链长度对聚合物结构和相应膜理化性质的影响。