Aryl‐Ether‐Free Polyaromatics‐Based Alkaline‐Resistant Anion exchange PTFE Composite Membrane

IF 2.5 4区 化学 Q3 POLYMER SCIENCE Macromolecular Chemistry and Physics Pub Date : 2024-08-22 DOI:10.1002/macp.202400215
Rikhil R. Iyer, Karteek Boga, Joseph F. Varga, Huanting Wang, Kei Saito
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Abstract

Novel aryl‐ether‐free polyaromatics with different‐sized cationic headgroups tethered to the backbone are synthesized via superacid‐catalyzed polycondensations and subsequent Menshutkin quaternization reactions for potential application as anion exchange membranes (AEMs) in electrolysis. Experimentally, the effect of four different heterocycloaliphatic quaternary ammonium cationic headgroups on the AEM properties, such as the hydroxide conductivity, water uptake, swelling ratios and alkaline stability, is fully explored. Thin films are prepared by spin‐coating these AEMs onto porous polytetrafluoroethylene substrates. With a high degree of quaternization, these new aryl‐ether free polyaromatic thin film AEMs achieved high conductivities and good mechanical stability. The highest hydroxide conductivity of 45 mS cm−1 is achieved with excellent alkaline stability and conductivity retention of 96% after 30 days in 1 m KOH at 80 °C. Due to the polytetrafluoroethylene substrates, the swelling ratios and water uptake are relatively small, which ensured the astute dimensional stability of these thin film AEMs. The combined effect of alkaline‐stable cationic headgroups, an aromatic backbone and a robust substrate led to a promising thin‐film AEM.
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不含芳基醚的聚芳烃基抗碱性阴离子交换聚四氟乙烯复合膜
通过超酸催化的缩聚反应和随后的门舒特金季铵化反应,合成了骨架上系有不同大小阳离子头基的新型无芳基醚聚芳烃,有望用作电解阴离子交换膜(AEM)。实验充分探讨了四种不同杂环脂族季铵阳离子头基对 AEM 性能的影响,如氢氧化物电导率、吸水性、膨胀比和碱性稳定性。薄膜是通过在多孔聚四氟乙烯基底上旋涂这些 AEM 而制备的。通过高度季铵化,这些新型不含芳基醚的聚芳烃薄膜 AEM 实现了高导电率和良好的机械稳定性。最高的氢氧化物电导率为 45 mS cm-1,具有极佳的碱性稳定性,在 80 °C 的 1 m KOH 溶液中 30 天的电导率保持率为 96%。由于采用了聚四氟乙烯基底,溶胀率和吸水率相对较小,这确保了这些薄膜 AEM 具有良好的尺寸稳定性。碱性稳定的阳离子头基、芳香族骨架和坚固的基底共同作用,造就了前景广阔的薄膜 AEM。
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来源期刊
Macromolecular Chemistry and Physics
Macromolecular Chemistry and Physics 化学-高分子科学
CiteScore
4.30
自引率
4.00%
发文量
278
审稿时长
1.4 months
期刊介绍: Macromolecular Chemistry and Physics publishes in all areas of polymer science - from chemistry, physical chemistry, and physics of polymers to polymers in materials science. Beside an attractive mixture of high-quality Full Papers, Trends, and Highlights, the journal offers a unique article type dedicated to young scientists – Talent.
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