Kim Ae Rhan, Vinothkannan Mohanraj, Park Chul Jin, Yoo Dong Jin
Department of Bioenvironmental Chemistry and R&D Center for CANUTECH, Business Incubation Center, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea.
Graduate School, Department of Energy Storage/Conversion Engineering, Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea.
Polymers (Basel). 2018 Dec 5;10(12):1346. doi: 10.3390/polym10121346.
In this contribution, sulfonated poly(ether ether ketone) (SPEEK) is inter-connected using a hydrophobic oligomer via poly-condensation reaction to produce SPEEK analogues as PEMs. Prior sulfonation is performed for SPEEK to avoid random sulfonation of multi-block copolymers that may destroy the mechanical toughness of polymer backbone. A greater local density of ionic moieties exist in SPEEK and good thermomechanical properties of hydrophobic unit offer an unique approach to promote the proton conductivity as well as thermomechanical stability of membrane, as verify from AC impedance and TGA. The morphological behavior and phase variation of membranes are explored using FE-SEM and AFM; the triblock (XYX) membranes exhibits a nano-phase separated morphology. Performance of PEFC integrated with blend and block copolymer membranes is determined at 60 °C under 60% RH. As a result, the triblock (XYX) membrane has a high power density than blend (2X1Y) membrane.
在本论文中，通过缩聚反应使用疏水性低聚物将磺化聚醚醚酮（SPEEK）相互连接，以制备作为质子交换膜（PEM）的SPEEK类似物。对SPEEK进行预磺化，以避免多嵌段共聚物的无规磺化，因为这可能会破坏聚合物主链的机械韧性。SPEEK中存在更高的离子基团局部密度，并且疏水单元具有良好的热机械性能，这为提高膜的质子传导率以及热机械稳定性提供了一种独特的方法，这已通过交流阻抗和热重分析得到验证。使用场发射扫描电子显微镜（FE-SEM）和原子力显微镜（AFM）研究了膜的形态行为和相变化；三嵌段（XYX）膜呈现出纳米相分离形态。在60℃、60%相对湿度下测定了集成有共混物和嵌段共聚物膜的质子交换膜燃料电池（PEFC）的性能。结果，三嵌段（XYX）膜比共混物（2X1Y）膜具有更高的功率密度。
