Kim Jun Ha, Vinothkannan Mohanraj, Kim Ae Rhan, Yoo Dong Jin
Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Korea.
R&D Education Center for Whole Life Cycle R&D of Fuel Cell Systems, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Korea.
Polymers (Basel). 2020 Feb 4;12(2):325. doi: 10.3390/polym12020325.
The anion exchange membrane may have different physical and chemical properties, electrochemical performance and mechanical stability depending upon the monomer structure, hydrophilicity and hydrophobic repeating unit, surface form and degree of substitution of functional groups. In current work, poly(arylene ether sulfone) (PAES) block copolymer was created and used as the main chain. After controlling the amount of NBS, the degree of bromination (DB) was changed in Br-PAES. Following that, quaternized PAES (Q-PAES) was synthesized through quaternization. Q-PAES showed a tendency of enhancing water content, expansion rate, ion exchange capacity (IEC) as the degree of substitution of functional groups increased. However, it was confirmed that tensile strength and dimensional properties of membrane reduced while swelling degree was increased. In addition, phase separation of membrane was identified by atomic force microscope (AFM) image, while ionic conductivity is greatly affected by phase separation. The Q-PAES membrane demonstrated a reasonable power output of around 64 mW/cm while employed as electrolyte in fuel cell operation.
取决于单体结构、亲水性和疏水性重复单元、表面形态以及官能团的取代程度，阴离子交换膜可能具有不同的物理和化学性质、电化学性能及机械稳定性。在当前工作中，制备了聚（亚芳基醚砜）（PAES）嵌段共聚物并用作主链。控制NBS的用量后，Br-PAES中的溴化度（DB）发生了变化。随后，通过季铵化反应合成了季铵化PAES（Q-PAES）。随着官能团取代程度的增加，Q-PAES呈现出含水量、膨胀率、离子交换容量（IEC）增加的趋势。然而，证实了膜的拉伸强度和尺寸性能降低，而溶胀度增加。此外，通过原子力显微镜（AFM）图像确定了膜的相分离，而离子电导率受相分离的影响很大。在燃料电池运行中用作电解质时，Q-PAES膜表现出约64 mW/cm的合理功率输出。
