Abstract
A novel dual responsive hydrogel was synthesized by inverse microemulsion polymerization, using itaconic acid as pH-responsive monomer and N- isopropylacrylamide as thermo-responsive monomer. pH- and temperature-sensitivity and dynamic viscoelasticity behaviour of the dual responsive hydrogels were investigated. Dual responsive hydrogels showed remarkable pH- and temperature-sensitivity and enhanced viscoelastic behaviour under high stress. Temperature-induced shrinkage range of the dual responsive hydrogels was higher and broader than that of the conventional poly(N-isopropylacrylamide) hydrogel. FTIR revealed the structure of dual responsive hydrogels. The as-synthesized regular and sphere-like hydrogel particles had the average particle size of 49 nm in the range of 30–78 nm. A novel dual responsive hydrogel, with average particle size of 49 nm, was synthesized by inverse microemulsion polymerization. Dual responsive hydrogels showed remarkable pH- and temperature-sensitivity and enhanced viscoelastic behaviour. Temperature-induced shrinkage range of the dual responsive hydrogels was higher and broader than that of conventional poly(N- isopropylacrylamide) hydrogel.
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