Abstract
Poly(N-isopropylacrylamide)-based ionic hydrogels were synthesized by free-radical polymerization with N-isopropylacrylamide as a monomer and imidazolium-based dicationic ionic liquid as a crosslinker. The dicationic crosslinkers [Cn(Vim)2][Br]2 were obtained by quaternizing 1-vinylimidazole (Vim) with dibromo compounds (Br-CnH2n-Br) with various alkyl chain length n, respectively. The effects of alkyl chain length and the amounts of crosslinker on the structure, swelling properties, interfacial adsorption and release of anionic dyes of the obtained ionic hydrogels were systematically investigated by using scanning electron microscopy, Fourier transform infrared spectroscopy and ultraviolet–visible spectroscopy. The obtained ionic hydrogels showed good swelling properties and 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, methyl blue, congo red, orange G, thymol blue and bromothymol blue. Different kinetic and adsorption isotherm models were used to describe the interfacial adsorption and release behaviors of anionic dyes, which were strongly dependent on the chemical structures of the dyes.
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Acknowledgements
We thank the National Natural Science Foundation of China (Nos. 21274129 and 21322406), the Fundamental Research Funds for the Central Universities (2014XZZX003-21) and the third level of 2013 Zhejiang Province 151 Talent Project for financial supports.
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Zhou, X., Wang, J., Nie, J. et al. Poly(N-isopropylacrylamide)-based ionic hydrogels: synthesis, swelling properties, interfacial adsorption and release of dyes. Polym J 48, 431–438 (2016). https://doi.org/10.1038/pj.2015.123
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DOI: https://doi.org/10.1038/pj.2015.123
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