Title of Paper:Crosslinked poly (ether ether ketone) hydroxide exchange membranes with improved conductivity

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Date of Publication:2014-06-01

Journal:JOURNAL OF MEMBRANE SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:459

Page Number:86-95

ISSN No.:0376-7388

Key Words:Hydroxide exchange membrane; 1,4-diazabicyclo [2,2,2] octane; Crosslinking; Ion concentration; Hydroxide conductivity

Abstract:Crosslinked poly (ether ether ketone) (PEEK) hydroxide exchange membranes are prepared using bifunctional cyclic ammonium, 1,4-diazabicyclo [2,2,2] octane (DABCO), as simultaneous quaternization and crosslinking reagent. Hydroxide conductivity and ion mobility are evaluated as a function of ion concentration, which integrates the counteracting effects of the hydroxide ion amount and crosslinking degree. With the increase of ion concentration, effective mobility of hydroxide ion increases to a high level and then levels off or slightly goes down, suggesting a balance existed between ion concentration and mobility in the crosslinked membranes. As a result, hydroxide conductivity increases rapidly to a high stable level, indicating the applicable range of ion concentration (up to 1.0 mol L-1) for improving hydroxide conductivity. The crosslinked membranes exhibit high hydroxide conductivity of 33.4 mS cm(-1) at 25 degrees C and low swelling ratio of 48.2% at 60 degrees C. Thermal stability (T-onset: 176 degrees C) of the crosslinked membranes is better as compared with the non-crosslinked (T-onset : 165 degrees C) and trimethylamine quaternized PEEK membranes., (C) 2014 Elsevier B.V. All rights reserved.