Anion exchange membranes with chemical stability, high conductivity, and high mechanical properties play an important role in alkaline fuel cells. Here, a series of CPX anion exchange membranes based on poly(styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) (SEBS) and branch polyethyleneimine (BPEI) are achieved by casting, in which BPEI acts as both a crosslinking agent and an OH⁻ conducting functional group. The introduction of BPEI facilitates the formation of good hydrophilic/hydrophobic microphase separation structure, thus improving the ion transport channel of CPX membrane. The physicochemical and electrochemical properties of the CPX membrane are significantly improved when the mass ratio of SEBS to BPEI is within an appropriate range. The OH⁻ conductivity of the CP2 membrane (the mass ratio of SEBS to BPEI is 2) can reach 66.63 mS cm⁻¹ at 80 °C, and more than 80% initial OH⁻ conductivity is maintained in 1.0 m NaOH solution for 20 d at 60 °C. The strategy of using a polymer with excellent alkali resistance and oxidation resistance as the main body and introducing a conductive group that can construct microphase separation can simultaneously improve the conductivity and membrane stability. This viable strategy is a promising construction method for anion exchange membranes that can be applied to fuel cells.

中文翻译：

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基于聚（苯乙烯-b-（乙烯-co-丁烯）-b-苯乙烯）（SEBS）的支化聚乙烯亚胺（BPEI）交联阴离子交换膜的制备

具有化学稳定性，高电导率和高机械性能的阴离子交换膜在碱性燃料电池中起着重要的作用。在此，通过浇铸获得了一系列基于聚（苯乙烯-b-（乙烯-共-丁烯）-b-苯乙烯）（SEBS）和支化聚乙烯亚胺（BPEI）的CPX阴离子交换膜，其中BPEI既是交联剂和OH ^-进行功能分组。BPEI的引入促进了良好的亲水/疏水微相分离结构的形成，从而改善了CPX膜的离子传输通道。当SEBS与BPEI的质量比在适当范围内时，CPX膜的物理化学和电化学性质得到显着改善。的OH ^-的CP2膜（SEBS的至BPEI的质量比为2）的导电率能达到66.63毫秒厘米^-1，在80℃，80％以上的初始OH ^-在60°C下在1.0 m NaOH溶液中保持20 d的电导率。使用具有优异的耐碱性和抗氧化性的聚合物作为主体并引入可构成微相分离的导电基团的策略可同时提高电导率和膜稳定性。这种可行的策略是一种可应用于燃料电池的阴离子交换膜的有前途的构建方法。