Anion exchange membranes (AEMs), as the core component of the new generation anion exchange membrane fuel cells (AEMFCs), directly determine the performance and the lifetime of this energy conversion device. Here, AEMs with pendant multiple quaternary ammonium anchored onto the poly(styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) (SEBS) backbone are synthesized. The comb‐shaped copolymer SEBS‐C16 is synthesized with N,N‐dimethyl‐1‐hexadecylamine and chloromethylated SEBS to improve solubility, then the multi‐cation crosslinker is prepared and grafted on the above backbone to fabricate a series of flexible multi‐cation crosslinked SEBS‐based AEMs (SEBS‐C16‐xC4, where x% is the ratio of the crosslinker to polystyrene block) with practical properties. The obtained SEBS‐C16‐20C4 membrane exhibits a microphase separated morphology with an interdomain spacing of 18.87 nm. Benefited from the ion channels, SEBS‐C16‐20C4 shows high conductivity of 77.78 mS/cm at 80°C. Additionally, the prepared SEBS‐C16‐20C4 membrane with ion exchange capacity of 2.35 mmol/g also exhibits enhanced alkaline stability (5.87% hydroxide conductivity decrease in 2 M NaOH solution at 80°C after 1,700 hr) and improved mechanical properties, compared with the non‐crosslinked SEBS‐C16 sample. Furthermore, AEMFC single cell performance is evaluated with the SEBS‐C16‐20C4 membrane, and a maximum power density of 182 mW/cm² is achieved at 80°C under H₂/O₂ conditions.

中文翻译：

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基于聚（苯乙烯-b-（乙烯-共-丁烯）-b-苯乙烯）的弹性耐用的多阳离子交联阴离子交换膜

阴离子交换膜（AEM）作为新一代阴离子交换膜燃料电池（AEMFC）的核心组件，直接决定了该能量转换装置的性能和寿命。在这里，合成了具有多个季铵根侧链的AEM，它们锚定在聚（苯乙烯-b-（乙烯-共-丁烯）-b-苯乙烯）（SEBS）骨架上。梳状共聚物SEBS-C16由N，N合成-二甲基-1-十六烷基胺和氯甲基化的SEBS以提高溶解度，然后制备多阳离子交联剂并将其接枝到上述骨架上，以制造一系列基于多阳离子交联SEBS的柔性AEM（SEBS-C16-xC4，其中x ％是具有实用性能的交联剂与聚苯乙烯嵌段的比例。获得的SEBS‐C16‐20C4膜表现出微相分离的形态，晶畴间距为18.87 nm。得益于离子通道，SEBS‐C16-20C4在80°C时显示出77.78 mS / cm的高电导率。此外，与离子交换容量为2.35 mmol / g的SEBS-C16-20C4膜相比，其碱性稳定性也得到了增强（1700小时后，在80°C下的2 M NaOH溶液中，氢氧化物电导率降低了5.87％），并改善了机械性能。非交联的SEBS-C16样品。²在H ₂ / O ₂条件下于80°C达到。