Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 574, Issue -, Pages 33-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.12.053
Keywords
Anion exchange membranes; Physically-crosslinked system; Ion-conducting additive; Ion conductivity; Van der Waals interaction
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2015M1A2A2058013]
- Incheon National University Research Grant
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An additive-induced physically crosslinked system for use as anion exchange membranes was developed by blending an additive (DHBQA) containing both long alkyl (C-12, dodecyl) and quaternary ammonium groups into a dodecyl-substituted and quaternary ammonium-functionalized PPO (poly(2,6-dimethyl-1,4-phenylene oxide)) (C12-PPO-QA). The additive, whose diammonium groups act as ion conductors, and whose long alkyl chains bind to the alkyl chains of the C12-PPO-QA polymer through van der Waals interactions, induced the formation of ion clusters as well as physical crosslinking of the C12-PPO-QA polymer. Controlling the amount of additive to maximize its intermolecular interactions with the polymer resulted in a PPO-10.8 membrane (10.8 wt% of additive relative to polymer) with very high ion conductivities of 49.2 mS cm(-1) at 20 degrees C and 107.6 mS cm(-1) at 80 degrees C and low swelling ratios of 18.2% at 20 degrees C and 33.3% at 80 degrees C, as well as excellent mechanical and alkaline stability. The H-2/O-2 single cell performance using PPO-10.8 reached a maximum power density about 60mWcm(-2), higher than that of the PPO-0 sample.
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