Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5147798 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
A series of anion exchange membranes of poly (fluorenylene ether sulfone) containing tertiary sulfonium hydroxide-functionalized fluorenyl groups were synthesized by sequential polycondensation, chloromethylation, substitution with dimethyl sulfide and ion exchange. They showed excellent solubility in polar aprotic solvents. Consequently, flexible and tough alkaline membranes with varying ionic contents were obtained by an anion exchange of tertiary sulfonium chloride polymers with 1.0 M KOH at room temperature. Different levels of substitution were performed to achieve high ionic conductivity as well as upholding the membranes' mechanical stability. The tertiary sulfonium membranes demonstrated lower water uptake compared to quaternary ammonium membrane. High hydroxide ion conductivity was achieved up to 18.3 mS cmâ1 at 80 °C with the membrane of the highest ion exchange capacity (IEC, 1.51 mmol gâ1). The resulting alkaline polymers were characterized by 1H NMR, FT-IR, thermogravimetric analysis (TGA), water uptake, IEC, atomic force microscopic (AFM) images.
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Authors
Hohyoun Jang, Md Awlad Hossain, Sabuj Chandra Sutradhar, Faiz Ahmed, Kunyoung Choi, Taewook Ryu, Kyungwhan Kim, Whangi Kim,