Abstract A series of tadpole-type ionic ionomers PPO-DMODAs with long alkyl side chains designed for electrodialysis (ED) desalination were synthesized successfully from dimethyloctadecylamine (DMODA) and brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO). The series of AEMs display stably low water uptakes ranging from 6.2% to 15.1% and high dimensional stabilities with swelling rations of 1.9%–4.8% at temperatures of 25 °C–60 °C. The nano-phase separated tadpole-type ionic structures ensure that the PPO-DMODAs membranes show excellent permselectivities with values above 94.6% and outstanding ED performances in the mostly reported desalination system of NaCl aqueous solutions. Especially, PPO-DMODA-3 surpasses commercial membrane TWEDA1 in ED competitions and ED-stability matches with current efficiency (η) of 88.7%, salt flux (J) of 80.61 mg m−2 s−1, energy consumption (EC) of per kg of NaCl of 2.56 kWh kg−1 and η retentions of the repeated runs higher than 97% of that of the origin run. Moreover, PPO-DMODA-3 membrane obtained from the ethanol solution exhibits stable aggregate structure and ED performances comparable to those of the PPO-DMODA-3 membranes cast with NMP and TCE solutions. Good solubility of PPO-DMODAs in ethanol offers an environmentally friendly green method to fabricate ED AEMs. In consideration of the advantages of low cost, simple synthesis process and green membrane casting technology, PPO-DMODA-3 membrane has a strong potential for ED-desalination application.

中文翻译：

---

用于电渗析脱盐的高选择性蝌蚪型离子阴离子交换膜

摘要 以二甲基十八烷基胺（DMODA）和溴化聚（2,6-二甲基-1,4-苯醚）为原料，成功合成了一系列用于电渗析（ED）脱盐的蝌蚪型离子离聚物PPO-DMODA（PPO-DMODA）。 BPPO）。该系列 AEM 显示出稳定的低吸水率，范围为 6.2% 至 15.1%，尺寸稳定性高，在 25 °C–60 °C 的温度下溶胀率为 1.9%–4.8%。纳米相分离的蝌蚪型离子结构确保 PPO-DMODAs 膜在大多数报道的 NaCl 水溶液脱盐系统中显示出超过 94.6% 的优异渗透选择性和出色的 ED 性能。特别是，PPO-DMODA-3 在 ED 比赛中超过了商用膜 TWEDA1，ED 稳定性匹配，电流效率 (η) 为 88.7%，盐通量 (J) 为 80。61 mg m-2 s-1，每千克 NaCl 的能耗 (EC) 为 2.56 kWh kg-1，并且重复运行的 η 保留高于原始运行的 97%。此外，从乙醇溶液中获得的 PPO-DMODA-3 膜表现出稳定的聚集结构和 ED 性能，可与用 NMP 和 TCE 溶液浇铸的 PPO-DMODA-3 膜相媲美。PPO-DMODA 在乙醇中的良好溶解性为制造 ED AEM 提供了一种环保的绿色方法。PPO-DMODA-3膜考虑到成本低、合成工艺简单、绿色膜浇注技术等优点，在ED-脱盐应用中具有强大的潜力。从乙醇溶液中获得的 PPO-DMODA-3 膜表现出稳定的聚集结构和 ED 性能，可与用 NMP 和 TCE 溶液浇铸的 PPO-DMODA-3 膜相媲美。PPO-DMODA 在乙醇中的良好溶解性为制造 ED AEM 提供了一种环保的绿色方法。PPO-DMODA-3膜考虑到成本低、合成工艺简单、绿色膜浇注技术等优点，在ED-脱盐应用中具有强大的潜力。从乙醇溶液中获得的 PPO-DMODA-3 膜表现出稳定的聚集结构和 ED 性能，可与用 NMP 和 TCE 溶液浇铸的 PPO-DMODA-3 膜相媲美。PPO-DMODA 在乙醇中的良好溶解性为制造 ED AEM 提供了一种环保的绿色方法。PPO-DMODA-3膜考虑到成本低、合成工艺简单、绿色膜浇注技术等优点，在ED-脱盐应用中具有强大的潜力。