Poly(,-Diethylacrylamide)-Based Thermoresponsive Hydrogels with Double Network Structure.

Temperature response of double network (DN) hydrogels composed of thermoresponsive poly(-diethylacrylamide) (PDEAAm) and hydrophilic polyacrylamide (PAAm) or poly(-dimethylacrylamide) (PDMAAm) was studied by a combination of swelling measurements, differential scanning calorimetry (DSC) and H NMR and UV-Vis spectroscopies. Presence of the second hydrophilic network in DN hydrogels influenced their thermal sensitivity significantly. DN hydrogels show less intensive changes in deswelling, smaller enthalpy, and entropy changes connected with phase transition and broader temperature interval of the transition than the single network (SN) hydrogels.