Thermoresponsive nanostructured poly(N-isopropylacrylamide) hydrogels made via inverse microemulsion polymerization |
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Authors: | V V A Fernandez N Tepale J C Sánchez-Díaz E Mendizábal J E Puig J F A Soltero |
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Institution: | (1) Departamento de Ingeniería Química, Universidad de Guadalajara, Boul. M. García Barragán# 1451, Guadalajara, 44430, Mexico;(2) Departamento de Química, Universidad de Guadalajara, Boul. M. García Barragán# 1451, Guadalajara, 44430, Mexico |
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Abstract: | The synthesis of nanostructured poly(N-isopropylacrylamide) (polyNIPA) hydrogels by a two-stage polymerization process is reported here. The process involves the
synthesis of slightly crosslinked polyNIPA nanoparticles by inverse (w/o) microemulsion polymerization; then, these particles
are dried, cleaned and dispersed in an aqueous solution of NIPA and a crosslinking agent (N,N-methylene-bis-acrylamide or NMBA) and polymerized to produce the nanostructured hydrogels. Their swelling and de-swelling
kinetics, volume phase transition temperatures (T
VPT) and mechanical properties at the equilibrium swollen state are investigated as a function of the weight ratio of polyNIPA
particles to monomer (NIPA). The nanostructured gels exhibit larger equilibrium water uptake, faster swelling and de-swelling
rates and similar T
VPT than those of the conventional ones; moreover, the elastic and Young moduli are larger than those of the conventional hydrogels
at similar swelling ratios. The fast swelling and de-swelling kinetics are explained in terms of the controlled inhomogeneities
introduced by the method of synthesis. |
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Keywords: | Poly(N-isopropylacrylamide) PolyNIPA hydrogel Microemulsion Nanostructured hydrogel Thermoresponsive hydrogel |
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