The synthesis of high-performance membranes is one of the most momentous issues for alkaline energy devices. To develop anion exchange membranes (AEMs) that combine high chemical stability and ionic conductivity, we have designed and prepared a series of AEMs based on poly(ether ketone cardo) (PEKC). Through a facile lactamization procedure between the cardo phenolphthalein group in PEKC and the amino group in 1-(2-aminoethyl)-4-methylpiperazine (AP), the flexible side-chain methylpiperazine group is introduced into the PEKC backbone. By using iodomethane (Me), 1-bromopentane (Pe) and 1-(5-bromopentyl)-1-methylpiperdinium bromide (Pip) as the quaternized regents for the methylpiperazine group, three different AEMs (named PEKC-AP-Me, PEKC-AP-Pe and PEKC-AP-Pip, respectively) are developed. Comparing with alkyl side chain grafted membranes, the PEKC-AP-Pip membrane with bis-cation groups exhibits the highest OH⁻ conductivity of 60.3 mS cm⁻¹ (80 °C) when its corresponding IEC is 1.13 mmol g⁻¹. Meanwhile, the PEKC-AP-Me, PEKC-AP-Pe and PEKC-AP-Pip membranes show excellent mechanical strengths of 36.2 MPa, 32.3 MPa and 26.3 MPa, respectively. Due to the good chemical stability of piperdinium cation and PEKC-AP main chain, the long side chain grafted AEMs also demonstrate good alkaline stability. When submersing in 1 M KOH solution at 80 °C, PEKC-AP-x membranes maintain their conductivities up to 1200 h. These good comprehensive properties grant the prepared PEKC-AP-x membranes ambitious future for alkaline energy devices.

高性能膜的合成是碱性能源装置最重要的问题之一。为了开发兼具高化学稳定性和离子电导率的阴离子交换膜 (AEM)，我们设计并制备了一系列基于聚醚酮卡多 (PEKC) 的 AEM。通过 PEKC 中的卡多酚酞基团与 1-(2-氨基乙基)-4-甲基哌嗪 (AP) 中的氨基之间的简单内酰胺化过程，将柔性侧链甲基哌嗪基团引入 PEKC 主链中。通过使用碘甲烷 (Me)、1-溴戊烷 (Pe) 和 1-(5-溴戊基)-1-甲基哌啶溴化物 (Pip) 作为甲基哌嗪基团的季铵化试剂，三种不同的 AEM（命名为 PEKC-AP-Me、PEKC -分别开发了 AP-Pe 和 PEKC-AP-Pip）。与烷基侧链接枝膜相比，⁻当相应的 IEC 为 1.13 mmol g ⁻¹时，电导率为 60.3 mS cm ⁻¹ (80 °C) 。同时，PEKC-AP-Me、PEKC-AP-Pe 和 PEKC-AP-Pip 膜分别表现出 36.2 MPa、32.3 MPa 和 26.3 MPa 的优异机械强度。由于哌啶阳离子和PEKC-AP主链的良好化学稳定性，长侧链接枝的AEMs也表现出良好的碱稳定性。当浸入 80 °C 的 1 M KOH 溶液中时，PEKC-AP- x膜可保持其电导率长达 1200 小时。这些良好的综合性能使制备的 PEKC-AP- x膜在碱性能源设备方面具有广阔的前景。