| Title | Side-chain-type imidazolium-functionalized anion exchange membranes: The effects of additional hydrophobic side chains and their hydrophobicity |
| Authors | Wei, Haibing Li, Yan Wang, Sheng Tao, Guoqing Wang, Tie Cheng, Sheng Yang, Shanzhong Ding, Yunsheng |
| Affiliation | Hefei Univ Technol, Sch Chem & Chem Engn, Anhui Key Lab Adv Funct Mat & Devices, Anhui Key Lab Adv Catalyt Mat & React Engn, Hefei 230009, Anhui, Peoples R China Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys,Minist Educ, Beijing 100871, Peoples R China |
| Keywords | Anion exchange membrane Phase separation Perfluorinated side chain |
| Issue Date | 2019 |
| Publisher | JOURNAL OF MEMBRANE SCIENCE |
| Abstract | Ionic-conducive polymers with highly ordered, phase-separated structure are the promising materials used as anion exchange membranes (AEMs), thanks to their pronounced ion mobility. In this study, apart from imidazolium-functionalized hydrophilic pendants, additional octyl and perfluorooctyl-containing grafts were tethered to the polymer backbone and the resultant structure-morphology relationships were systemically investigated. The results revealed that the introduction of hydrophobic side chains as well as the corresponding hydrophobicity plays an important role in the formation of a phase-separated morphology in the membrane. AEMs containing perfluorooctyl-containing pendants (PPO-x-Im(y)8F(z)) exhibited a pronounced microphase-separated morphology with ion clusters of about 2-5 nm size and a spacing of similar to 6 nm, while the membranes with octyl pendants (PPO-x-Im(y)8C(z)) or no additional hydrophobic side chains (PPO-x-Im) only showed indistinct or no phase separation. In addition, PPO-x-Im(y)8F(z) AEMs showed better ion conductivity and suppressed water absorption, thereby exhibiting a good balance between water uptake and ion conductivity. The results of this study provide an efficient strategy to guide the architectural design of high-performance AEMs. |
| URI | http://hdl.handle.net/20.500.11897/548079 |
| ISSN | 0376-7388 |
| DOI | 10.1016/j.memsci.2019.02.058 |
| Indexed | SCI(E) EI |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ 高分子化学与物理教育部重点实验室 |
