The alkali stability of radiation-grafted anion-exchange membranes containing pendent 1-benzyl-2,3-dimethylimidazolium head-groups
The alkali stability of radiation-grafted anion-exchange membranes containing pendent 1-benzyl-2,3-dimethylimidazolium head-groups
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DOI：
10.1039/c2ra22331g
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发表时间：
2013-01
期刊：
影响因子：
3.9
通讯作者：
Oliver M. M. Page-Oliver-M.-M.-Page-143823632;Simon D. Poynton;Sam Murphy;A. Ong;Donna M. Hillman;C. Hancock;Michael G. Hale;D. Apperley;J. Varcoe
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文献类型：
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作者：
Oliver M. M. Page-Oliver-M.-M.-Page-143823632;Simon D. Poynton;Sam Murphy;A. Ong;Donna M. Hillman;C. Hancock;Michael G. Hale;D. Apperley;J. Varcoe
合成了含有悬垂苄基三甲基铵、1-苄基-3-甲基咪唑和1-苄基-2,3-二甲基咪唑官能团的辐射接枝阴离子交换膜（AEM），离子交换容量在1.7 ~ 1.9 meq g−1之间。AEMs的离子电导率也相当（在50°C时为24.5±1.8 mS cm−1）。在60℃氢氧化钾水溶液（1 mol dm−3）中，1-苄基-2,3-二甲基咪唑头基的碱稳定性优于1-苄基-3-甲基咪唑，但低于苯三甲基铵基准头基。含有悬垂的1-苄基-2,3-二甲基咪唑头基的辐射接枝AEMs不适合在高碱性环境下的电化学器件中应用。
Radiation-grafted anion-exchange membranes (AEM) containing pendent benzyltrimethylammonium, 1-benzyl-3-methylimidazolium and 1-benzyl-2,3-dimethylimidazolium functional head-groups were synthesised with ion-exchange capacities in the range 1.7–1.9 meq g−1. The ionic conductivities of the AEMs were also comparable (24.5 ± 1.8 mS cm−1 at 50 °C). The alkali stability (in aqueous potassium hydroxide (1 mol dm−3) at 60 °C) of the 1-benzyl-2,3-dimethylimidazolium head-groups was superior to the 1-benzyl-3-methylimidazolium but inferior to the benzyltrimethylammonium benchmark head-groups. Radiation-grafted AEMs containing pendent 1-benzyl-2,3-dimethylimidazolium head-groups are not suitable for application in electrochemical devices containing highly alkaline environments.