| In order to solve the shortcomings of the traditional hydrogel, in the present paper, the thermo-and pH-sensitive hydrogel and microporous hydrogel NP10-AA induced by the NP-10 (polyoxyethylene (10) nonyl phenyl ether) aqueous two-phase system were synthesized by solution copolymerization using acrylic acid and sodium acrylate. The influences of synthesis conditions on reaction and on products properties were investigated and the optimal synthesis conditions were indentified. The copolymerization mechanism was discussed and a model of network structure of NP10-AA hydrogel and a model of swelling behavior were built and the water-absorbing mechanism of NP10-AA hydrogel was elaborated. The samples were characterized by Fourier Transform infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR). Moreover, the effects of the temperature and pH of exterior solution on water absorbency were studied in detail. Based on the equilibrium swelling theory and rubber elasticity theory, a series of equilibrium formulas fitting to experiment data were deduced using Flory-Huggins lattice theory and thermodynamic theory. |
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