Al Munsur, Abu Zafar Lee, Junghwa Chae, Ji Eon Kim, Hyoung Juhn Park, Chi Hoon Nam, Sang Yong Kim, Tae-Hyun 2024-01-19T12:32:29Z 2024-01-19T12:32:29Z 2022-04-03 2022-03 0376-7388 https://pubs.kist.re.kr/handle/201004/115589 The new hydrophilic-hydrophobic comb-type anion exchange membrane (AEM) was prepared from SEBS grafted with hexyl quaternary ammonium (HQA) and fluorobenzoyl. As confirmed by XRD and TEM, a better phase separation was obtained by adding a highly hydrophobic fluorine-substituted pendant as an enhanced hydrophobic spacer to the conducting head group (which contained a hexyl spacer as a hydrophilic unit). The HQA-F1-SEBS and HQA-F5-SEBS membranes, with fluorobenzoyl and pentafluorobenzoyl pendants, respectively, showed enhanced hydrophobicity compared to their non-fluorinated counterpart (HQA-SEBS). The highest hydroxide ion conductivity (87.0 in water and 14.37 mS cm(-1) at 95% RH) was obtained at 80 degrees C with HQA-F5-SEBS, which exhibited the most thermodynamic incompatibility between hydrophilic and hydrophobic units. The mechanical properties (tensile strength and Young's Modulus) of the HQA-F5-SEBS membrane were also improved; they were almost 2.5 times higher than those of the HQA-SEBS. The HQA-F5-SEBS showed a current density of 500 mA cm(-2) at a potential of 0.6 V and a peak power density of 354 mW cm(-2). It also showed stable-cell durability for up to 100 h. Compared with the typical hydrophilic comb-type SEBS membrane and the previously reported SEBSbased AEM, its cell performance was significantly higher. English Elsevier BV Hexyl quaternary ammonium- and fluorobenzoyl-grafted SEBS as hydrophilic-hydrophobic comb-type anion exchange membranes Article 10.1016/j.memsci.2021.120029 1 Journal of Membrane Science, v.643 Journal of Membrane Science 643 N scie scopus 000744265900004 2-s2.0-85119263136 Engineering, Chemical Polymer Science Engineering Polymer Science Article ELECTROLYTE FUEL-CELLS WATER PERFORMANCE Hydrophobic fluorinated side-chain Phase-separation Enhanced conductivity Anion exchange membranes Hydrophilic-hydrophobic comb-type