Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 44, Pages 24256-24266Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.07.134
Keywords
Anion exchange membranes; poly(arylene ether sulfone nitrile)s; Multiblock copolymers; Fluorene groups; Conductivity
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Funding
- National Natural Science Foundation of China of China [21706032, 21701024]
- Young and Middle-aged Teachers Education Scientific Research Project of Fujian Province of China [JAT170378]
- Scientific Research Foundation of Huaqiao University [605-50Y18020]
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A series of novel fluorene-containing poly(arylene ether sulfone nitrile)s (FPESN-m/n) multiblock copolymers bearing 1,2-dimethylimidazole groups (ImFPESN-m/n) were synthesized for preparing anion exchange membranes (AEMs). Bromination rather than chloromethylation was used in this work. The bulky and rigid fluorene groups were introduced to force each chain apart to create large interchain spacing. Strong polar nitrile groups were introduced into the hydrophobic segments with the intention of enhancing the anti-swelling property of the AEMs. The length of fluorene containing hydrophobic segment was varied to study the structure-property of the AEMs. With the ion groups anchored selectively and densely on the hydrophilic segments, all the AEMs exhibited well-defined hydrophilic/hydrophobic microphase-separated structures. As a result, the AEMs showed high hydroxide conductivities in the range of 35.2 -118.3 mS cm(-1) from 30 to 80 degrees C and superb ratios of ionic conductivity to swelling at 80 degrees C. Furthermore, the AEMs also exhibited good mechanical properties, thermal and alkaline stabilities. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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