College of Polymer Science and Engineering, Sichuan University, State Key Laboratory of Polymer Materials Engineering, Chengdu 610065, Sichuan, People's Republic of China.
College of Polymer Science and Engineering, Sichuan University, State Key Laboratory of Polymer Materials Engineering, Chengdu 610065, Sichuan, People's Republic of China.
J Colloid Interface Sci. 2019 Nov 15;556:420-431. doi: 10.1016/j.jcis.2019.08.086. Epub 2019 Aug 24.
A kind of side-chain type anion exchange membranes (AEMs) with high ionic conductivity and good comprehensive stability was prepared via direct modification of commercial engineering plastic polyketone with diamines through Paal-Knorr reaction and quaternization reaction. It was found that the amount of diamine can effectively tune the microphase morphology and properties of the prepared quaternized functionalized-polyketone anion exchange membranes (QAFPK-AEMs). The tensile strength was increased from 18.6 MPa to 38.6 MPa, and the ion exchange capacity (IEC) was increased from 1.11 mmol/g to 2.71 mmol/g depending on the amount of added diamine. The QAFPK-1-6-AEM with the IEC of 1.43 mmol/g showed the highest hydroxide conductivity of 65 mS/cm at 25 °C and 96.8 mS/cm at 80 °C. The high ionic conductivity was achieved through the establishment of effective ionic channels, and it maintained 70% of the initial ionic conductivity after the 192 h treatment in 2 mol/L KOH (aq) at 80 °C. Moreover, a peak power density of 129 mW/cm was achieved when the assembled single cell with QAFPK-1-6-AEM was operated at 50 °C. Thus, the prepared QAFPK-AEMs showed great potential applications for the anion exchange membrane fuel cells (AEMFCs).
一种具有高离子电导率和良好综合稳定性的侧链型阴离子交换膜（AEMs）通过 Paal-Knorr 反应和季铵化反应，直接用二胺对商业工程塑料聚酮进行修饰而制得。结果发现，二胺的用量可以有效地调节所制备的季铵化功能化聚酮阴离子交换膜（QAFPK-AEMs）的微相形态和性能。拉伸强度从 18.6 MPa 增加到 38.6 MPa，离子交换容量（IEC）从 1.11 mmol/g 增加到 2.71 mmol/g，这取决于添加的二胺的量。IEC 为 1.43 mmol/g 的 QAFPK-1-6-AEM 在 25°C 时具有最高的氢氧化物电导率为 65 mS/cm，在 80°C 时为 96.8 mS/cm。高离子电导率是通过建立有效的离子通道来实现的，在 80°C、2 mol/L KOH（aq）中处理 192 h 后，其离子电导率仍保持初始值的 70%。此外，当用 QAFPK-1-6-AEM 组装的单电池在 50°C 运行时，可获得 129 mW/cm 的峰值功率密度。因此，所制备的 QAFPK-AEMs 在阴离子交换膜燃料电池（AEMFCs）中具有很大的应用潜力。
