Synthesis and swelling behavior of thermosensitive hydrogels based on N-substituted acrylamides and sodium acrylate |
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Authors: | Caihua Ni Xiao-Xia Zhu |
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Affiliation: | a State Key Laboratory of Functional Polymer for Adsorption and Separation, School of Chemistry, Polymer Institute, Nankai University, 300071 Tianjin, China b School of Chemical and Material Engineering, Southern Yangtze University, 214000 Wuxi, China c Département de Chimie, Université de Montréal, C. P. 6128, Succursale Centre-ville, Montréal, Québec, Canada H3C 3J7 |
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Abstract: | A series of hydrogels based on N-isopropylacrylamide, sodium acrylate, and N-tert-butylacrylamide were synthesized by free radical polymerization in a mixture of dioxane and water with tetra(ethylene glycol) diacrylate as the crosslinker and benzoyl peroxide as the initiator. The swelling behavior including the swelling rate of the crosslinked gels in water was studied with gravimetric method. The swelling ratio of the gel (0.1 mol% crosslinking) can reach 420 g/g at 20 °C and such a gel can release 96% of the water absorbed at 40 °C. The lower critical swelling temperature (LCST) of the copolymers can be adjusted by changing the chemical composition of the polymers. Such crosslinked gels can be potentially used as thermosensitive superabsorbent because of their high water uptake and thermal sensitivity. |
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Keywords: | N-isopropylacrylamide Copolymerization Thermosensitivity Hydrogels |
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