Anion exchange membranes based on poly (styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) grafted poly (2,6‐dimethyl‐1,4‐phenylene oxide)
Anion exchange membranes based on poly (styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) grafted poly (2,6‐dimethyl‐1,4‐phenylene oxide)
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基于聚(苯乙烯-b-(乙烯-共-丁烯)-b-苯乙烯)接枝聚(2,6-二甲基-1,4-苯醚)的阴离子交换膜
DOI：
10.1002/app.53579
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发表时间：
2022-12
影响因子：
3
通讯作者：
Shanjun Gao
中科院分区：
文献类型：
--
作者：
Rui Liu;Yiwen Nie;Junjie Chen;Chunhui Shen;Shanjun Gao
聚(苯乙烯-b-(乙烯-共-丁烯)-b-苯乙烯)(SEBS)由于其优越的柔韧性和化学稳定性在阴离子交换膜(AEMs)领域得到了广泛的研究，但功能化SEBS较差的尺寸稳定性限制了其进一步应用。因此，我们采取了一种有效的策略，通过威廉姆森醚合成反应接枝聚（2,6-二甲基-1,4-苯醚）（PPO）来增强基于SEBS的AEM。添加PPO后，接枝膜表现出优异的综合性能，如机械强度、化学稳定性，尤其是尺寸稳定性。 PPO含量最高的SEBS-PPO-QA-1接枝膜表现出最佳的拉伸强度（20.54 MPa）和抑制的溶胀行为（25℃时溶胀率为4.81%）。此外，SEBS-PPO-QA-1接枝膜在80℃碱处理10天后电导率保持率高达92.71%。 SEBS-PPO-QA-3接枝膜的离子交换容量为1.719 mmol/g，SEBS-PPO-QA-3接枝膜的离子电导率在80℃时达到58.27 mS/cm，在20℃时达到25.53 mS/cm。因此，结合了PPO和SEBS优点的SEBS-PPO-QA-X接枝膜在AEM应用中具有广阔的前景。
Poly (styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS) has been widely studied in the field of anion exchange membranes (AEMs) due to its superior flexibility and chemical stability, but the poor dimensional stability of functionalized SEBS restricts its further application. Thus, we adopt an effective strategy to reinforce AEMs based on SEBS via grafting poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) using Williamson ether synthesis reaction. With the addition of PPO, grafted membranes exhibit outstanding comprehensive properties, such as mechanical strength, chemical stability, especially dimensional stability. SEBS-PPO-QA-1 grafted membrane with the highest content of PPO showed the best tensile strength (20.54 MPa), and restrained swelling behavior (swelling ratio of 4.81% at 25 degrees C). Moreover, the conductivity retention of SEBS-PPO-QA-1 grafted membrane is up to 92.71% at 80 degrees C after 10 days alkaline treatment. The ion exchange capacity of SEBS-PPO-QA-3 grafted membrane is 1.719 mmol/g, and the ionic conductivity of SEBS-PPO-QA-3 grafted membrane reach 58.27 mS/cm at 80 degrees C and 25.53 mS/cm at 20 degrees C. Therefore, the SEBS-PPO-QA-X grafted membranes, which combine the advantages of PPO and SEBS, are promising in AEM application.
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