Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, and Education Center for Whole Life Cycle R&D of Fuel Cell Systems , Chonbuk National University , Jeonju 54896 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Jun 20;10(24):20835-20844. doi: 10.1021/acsami.8b03790. Epub 2018 Jun 6.
The series of sulfonated poly(arylene ether ketone) (SPAEK) block copolymers with controlled F-oligomer length bearing pendant diphenyl unit were synthesized via a polycondensation reaction. Sulfonation was verified by H NMR analysis to introduce sulfonic acid group selectively and intensively on the pendant diphenyl unit of polymer backbones. The SPAEK membranes fabricated by the solution casting approach were very transparent and flexible with the thickness of ∼50 μm. These membranes with different F-oligomer lengths were investigated to the physiochemical properties such as water absorption, dimensional stability, ion exchange capacity, and proton conductivity. As a result, the SPAEK membranes (X4.8Y8.8, X7.5Y8.8, and X9.1Y8.8) in accordance to increasing the length of hydrophilic oligomer showed excellent proton conductivity in range of 131-154 mS cm compared to Nafion-115 (131 mS cm) at 90 °C under 100% relative humidity (RH). Among the SPAEK membranes, proton conductivity of SPAEK X9.1Y8.8 (140.7 mS cm) is higher than that of Nafion-115 (102 mS cm) at 90 °C under 80% RH. The atomic force microscopy image demonstrated that number of ion transport channels is increased with increase in the length of hydrophilic oligomer in the main chains, and the morphology is proved to be related to the proton conductivity. The synthesized SPAEK membrane exhibited a maximum power density of 324 mW cm, which is higher than that of Nafion-115 (291 mW cm) at 60 °C under 100% RH.
通过缩聚反应合成了一系列具有受控 F-低聚物长度和支化二苯单元的磺化聚（芳基醚酮）（SPAEK）嵌段共聚物。通过 H NMR 分析验证了磺化反应，可选择性和集中地在聚合物主链的支化二苯单元上引入磺酸基团。通过溶液浇铸法制备的 SPAEK 膜非常透明且具有柔韧性，厚度约为 50μm。研究了不同 F-低聚物长度的 SPAEK 膜的物理化学性质，如吸水率、尺寸稳定性、离子交换容量和质子电导率。结果表明，随着亲水性低聚物长度的增加，SPAEK 膜（X4.8Y8.8、X7.5Y8.8 和 X9.1Y8.8）在 90°C、100%相对湿度（RH）下的质子电导率在 131-154 mS cm 范围内优于 Nafion-115（131 mS cm）。在这些 SPAEK 膜中，SPAEK X9.1Y8.8（140.7 mS cm）的质子电导率在 90°C、80% RH 下高于 Nafion-115（102 mS cm）。原子力显微镜图像表明，随着主链中亲水性低聚物长度的增加，离子传输通道的数量增加，形态与质子电导率有关。合成的 SPAEK 膜在 100% RH、60°C 下的最大功率密度为 324 mW cm，高于 Nafion-115（291 mW cm）。
