Abstract
We synthesized a series of poly(N-isopropylacrylamide)-based ionic hydrogels with dicationic ionic liquid crosslinking structures. The obtained ionic hydrogels showed typical feature of poly(ionic liquid) in aqueous solutions, of which the quaternized imidazolium moieties could interfacially interact with anionic dyes, such as methyl orange (MO), methyl blue (MB), congo red (CR), orange G (OG), thymol blue (TB) and bromothymol blue (BTB), which were strongly dependent on the chemical structures of the dyes.
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