Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7022203 | Journal of Membrane Science | 2014 | 10 Pages |
Abstract
Crosslinked poly (ether ether ketone) (PEEK) hydroxide exchange membranes are prepared using bi-functional 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 Lâ1) for improving hydroxide conductivity. The crosslinked membranes exhibit high hydroxide conductivity of 33.4 mS cmâ1 at 25 °C and low swelling ratio of 48.2% at 60 °C. Thermal stability (Tonset: 176 °C) of the crosslinked membranes is better as compared with the non-crosslinked (Tonset: 165 °C) and trimethylamine quaternized PEEK membranes.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Junjun Wang, Gaohong He, Xuemei Wu, Xiaoming Yan, Yanpu Zhang, Yongdong Wang, Lin Du,