The alkali stability of radiation-grafted anion-exchange membranes containing pendent 1-benzyl-2,3-dimethylimidazolium head-groups

作者：Page Oliver M M^*; Poynton Simon D; Murphy Sam; Ong Ai Lien; Hillman Donna M; Hancock Cathryn A; Hale Michael G; Apperley David C; Varcoe John R

来源：RSC Advances, 2013, 3(2): 579-587.

DOI：10.1039/c2ra22331g

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 degrees C). The alkali stability (in aqueous potassium hydroxide (1 mol dm(-3)) at 60 degrees 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.

• 出版日期2013