화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.107, 436-443, March, 2022
DOI10.1016/j.jiec.2021.12.014  Export Citation
Influence of crosslinking in phosphoric acid-doped poly(phenylene oxide) membranes on their proton exchange membrane properties
Cheong-Min Min, Joseph Jang, Beom-Goo Kang1, †, and Jae-Suk Lee†
  • School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
  • 1Department of Chemical Engineering, Soongsil University, Seoul 06978, Republic of Korea
E-mail:,
Phosphoric acid (PA)-doped membranes are promising electrolytes for high-temperature proton exchange membrane fuel cells (HT-PEMFCs). However, long-term durability issues have been an obstacle to their commercialization. Herein, we report a series of poly(phenylene oxide) (PPO)-based crosslinked membranes containing quaternary ammonium (QA) groups and exhibiting enhanced physicochemical stability and PA retention via ion-pair interactions between QA and PA. The degree of crosslinking in PPO by diamine crosslinker was controlled at 20, 30, and 40. The membranes were also crosslinked (degree = 20) using diamine crosslinkers with variable alkyl chain length (ethyl, butyl, and hexyl). All membranes exhibited sufficient thermal stability (5% weight loss temperatures (TD5%) = ∼230 °C) and oxidative stability (∼85% in the Fenton test). The PA uptake of the resulting membranes was controlled between 110 and 154% depending on their crosslinked structures. The membrane with the lowest degree of crosslinking (20) and shortest crosslinker exhibited the highest PA uptake and highest anhydrous proton conductivity (0.043 S/cm at 150 °C) in doped state. The proton conductivity was found to be significantly influenced by the PA uptake and crosslinked membrane structures. The highest PA retention of 89% was exhibited by the PA-doped membrane with the highest degree of crosslinking (40).
Keywords:High-temperature proton exchange membranes;Phosphoric acid;Quaternary ammonium;Ion-pair interaction;Crosslinking
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