Journal
APPLIED SURFACE SCIENCE
Volume 493, Issue -, Pages 1306-1316Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.07.059
Keywords
Anion exchange membrane; Branched poly(arylene ether sulfone)s; Imidazolium groups; Flexible alkyl side chains
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Funding
- National Basic Research Program of China [2014CB643600]
- Natural Science Foundation of Guangdong Province [2015A030313546]
- National Natural Science Foundation of China [51773318]
- Shenzhen Sci & Tech Research Grant [JCYJ201303291 05010137, ZDSYS201507141105130, JCYJ 20150331142303052]
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A set of highly branched imidazolium-functionalized poly(arylene ether sulfone)s copolymer bearing with flexible alkyl side chains of different lengths are designed and synthesized. The ion exchange capacity (IEC), ionic conductivity, water uptake, thermal stability, mechanical property and alkaline resistance of the anion exchange membranes (AEMs) were evaluated in detail. Atomic force microscopy and small-angle X-ray scattering are used to study morphology which reveals that the branched membrane with an alkyl side chain (6 carbons) achieves the highest conductivity (up to 115.8 mS cm(-1) at 80 degrees C) due to the well-developed hydrophilic/hydrophobic phase separation. In addition, the branched co-polymer AEM with a longer alkyl side chain (12 carbons) exhibit the best robust alkaline stability, it decreases only 27% of ionic conductivity after 550 h in 1 M KOH. Therefore, this study provides a comprehensive insight into the tuneable membrane properties of highly branched copolymers as a change in the length of flexible alkyl side chains.
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