2018 年 22 巻 4 号 p. 103-109
New nanocomposite hydrogels were synthesized by photopolymerization of mixtures containing clay mineral, N-isopropylacrylamide, and sodium acrylate with or without tetrasodium pyrophosphate as a dispersant. Addition of the dispersant was effective for gelating the mother mixture containing sodium acrylate. The stability and swelling behaviors of the obtained nanocomposites were investigated in deionized water at 25, 40, 50 and 60°C. Water absorbability of the nanocomposites increased with increasing content of sodium acrylate but hydrogels with high sodium acrylate content were unstable in hot water. The swelling kinetics were analyzed by a pseudo-second order rate equation.
