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Crosslinked poly (2,6-dimethyl-1,4-phenylene oxide) polyelectrolyte enhanced with poly (styrene- b -(ethylene- co -butylene)- b -styrene) for anion exchange membrane applications
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.memsci.2018.07.039
Zhihua Wang , Ziming Li , Nanjun Chen , Chuanrui Lu , Fanghui Wang , Hong Zhu

Abstract Poly (styrene‑b‑(ethylene-co-butylene)‑b‑styrene) (SEBS) shows great potential in anion exchange membranes (AEMs) due to its high chemical stability and flexible mechanical properties, but the trade-off between the ion conductivity and gelation issues greatly impedes further applications. To address this dilemma, we present an effective strategy to enhance comprehensive properties of AEMs by fabricating a crosslinking structure between SEBS and poly (2,6-dimethyl-1,4-phenylene oxide) (PPO). Grafting multiple cations as the side chains ensures the highly efficiently transport of hydroxide. With the addition of SEBS, the crosslinked membranes (T3PPO-c-SEBS) show enhanced physical and chemical properties, such as restrained swelling behavior, firm mechanical properties, great chemical and dimensional stabilities. Obvious hydrophilic/hydrophobic microphase separation morphology is designed to form effective ionic channels for transmitting hydroxide. The T3PPO-c-30%SEBS membrane with 30 wt% content of SEBS exhibits relatively high hydroxide conductivity (24.0 mS/cm at 30 °C) but low swelling ratios (15.6% at 30 °C). Moreover, after the long-time alkaline test (1 M NaOH, 80 °C, 500 h) and antioxidative test (Fenton solution, room temperature, 150 h), the T3PPO-c-30%SEBS membrane shows much better alkaline stability (57.8% retention vs. 24.5%) and oxidative stability (92.0% retention vs. 85.8%) than the pristine T3PPO membrane does. Therefore, T3PPO-c-SEBS can be regarded as promising candidates for AEM applications.

中文翻译:

交联聚(2,6-二甲基-1,4-苯醚)聚电解质用聚(苯乙烯-b-(乙烯-共-丁烯)-b-苯乙烯)增强,用于阴离子交换膜应用

摘要 聚 (苯乙烯-b-(乙烯-共-丁烯)-b-苯乙烯) (SEBS) 由于其高化学稳定性和灵活的机械性能在阴离子交换膜 (AEM) 中显示出巨大的潜力,但在离子电导率和凝胶化问题极大地阻碍了进一步的应用。为了解决这个难题,我们提出了一种有效的策略,通过在 SEBS 和聚(2,6-二甲基-1,4-苯醚)(PPO)之间制造交联结构来增强 AEM 的综合性能。接枝多个阳离子作为侧链确保了氢氧化物的高效运输。添加 SEBS 后,交联膜 (T3PPO-c-SEBS) 显示出增强的物理和化学性能,例如抑制溶胀行为、牢固的机械性能、良好的化学和尺寸稳定性。明显的亲水/疏水微相分离形态旨在形成有效的离子通道以传输氢氧化物。具有 30 wt% SEBS 含量的 T3PPO-c-30%SEBS 膜表现出相对较高的氢氧化物电导率(30 °C 时为 24.0 mS/cm),但溶胀率较低(30 °C 时为 15.6%)。此外,经过长时间碱性试验(1 M NaOH,80 °C,500 h)和抗氧化试验(Fenton溶液,室温,150 h),T3PPO-c-30%SEBS膜表现出更好的碱性稳定性(与原始 T3PPO 膜相比,保留 57.8% 与 24.5%)和氧化稳定性(保留 92.0% 与 85.8%)。因此,T3PPO-c-SEBS 可被视为 AEM 应用的有前途的候选者。具有 30 wt% SEBS 含量的 T3PPO-c-30%SEBS 膜表现出相对较高的氢氧化物电导率(30 °C 时为 24.0 mS/cm),但溶胀率较低(30 °C 时为 15.6%)。此外,经过长时间碱性试验(1 M NaOH,80 °C,500 h)和抗氧化试验(Fenton溶液,室温,150 h),T3PPO-c-30%SEBS膜表现出更好的碱性稳定性(与原始 T3PPO 膜相比,保留 57.8% 与 24.5%)和氧化稳定性(保留 92.0% 与 85.8%)。因此,T3PPO-c-SEBS 可被视为 AEM 应用的有前途的候选者。具有 30 wt% SEBS 含量的 T3PPO-c-30%SEBS 膜表现出相对较高的氢氧化物电导率(30 °C 时为 24.0 mS/cm),但溶胀率较低(30 °C 时为 15.6%)。此外,经过长时间碱性试验(1 M NaOH,80 °C,500 h)和抗氧化试验(Fenton溶液,室温,150 h),T3PPO-c-30%SEBS膜表现出更好的碱性稳定性(与原始 T3PPO 膜相比,保留 57.8% 与 24.5%)和氧化稳定性(保留 92.0% 与 85.8%)。因此,T3PPO-c-SEBS 可被视为 AEM 应用的有前途的候选者。与原始 T3PPO 膜相比,T3PPO-c-30%SEBS 膜显示出更好的碱性稳定性(57.8% 保留对 24.5%)和氧化稳定性(92.0% 保留对 85.8%)。因此,T3PPO-c-SEBS 可被视为 AEM 应用的有前途的候选者。与原始 T3PPO 膜相比,T3PPO-c-30%SEBS 膜显示出更好的碱性稳定性(57.8% 保留对 24.5%)和氧化稳定性(92.0% 保留对 85.8%)。因此,T3PPO-c-SEBS 可被视为 AEM 应用的有前途的候选者。
更新日期:2018-10-01
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