An ethyl imidazolium-functionalized poly(arylene ether sulfone) (EI-PES) block copolymer was prepared as a novel anion exchange membrane. The EI-PES polymer was synthesized by polycondensation between the F- and OH-terminated oligomers, followed by benzylic bromination and imidazolium functionalization (homogeneous functionalization). The quaternary ammonium-functionalized PES (QA-PES) was also prepared by heterogeneous functionalization, and the properties were compared with EI-PES. The membrane obtained from EI-PES showed a well-defined phase separated morphology between hydrophobic and hydrophilic ionic units of the block copolymer. An IEC of 1.45 meq/g with hydroxide conductivity of 0.03 S/cm at r.t. was observed for EI-PES. The EI-PES membrane also displayed excellent dimensional, thermal, mechanical and chemical stabilities.
Bibliographical noteFunding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant, funded by the Korean government (MEST) ( 2011-0022859 ). Part of this work was also supported by a research grant from the Korea Institute of Science and Technology as a part of the “E-BANK” program in 2012.
- Anion exchange membrane
- Block copolymer
- Imidazolium-functionalized polymer
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry