engleski

Swelling properties of cellulose-g-PDMAEMA hydrogels

Hydrogels possess unique properties in terms of porosity, swelling, mechanics, even biological responses that make them relevant to a broad range of potential applications. In order to prepare hydrogel abundant natural material cellulose, rich in hydroxyl groups, was modified by graft copolymerization with poly(2-dimethylaminoethyl methacrylate) (PDMAEMA)[1]. Hydrogles are prepared from cellulose:DMAEMA in the ratios 1:1, 1:3 or 1:5 and crosslinked with N, N-methylenebis(acrylamide) i) via chemical synthesis or ii) by additional irradiation (10, 30 or 100 kGy) [2]. The hydrogel spheres have been prepared and their swelling kinetics was studied in deionized water at 20 °C for 14 days. The swelling study of hydrogels prepared by chemical synthesis showed large equilibrium swelling (600 to 900 %). Samples 1-3_CP and 1-5_CP reached the maximum swelling degree in two days, while sample 1-1_CP reached it in seven days, suggesting that PDMAEMA contributes to the faster swelling. Selected samples were structurally characterized by scanning electron microscopy and recorded micrographics revealed structural differences related to the content of PDMAEMA.

hydrogels ; cellulose ; poly(2-dimethylamino ethyl methacrylate) ; equilibrium swelling

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