OBTAINING AND STUDYING HYDROGELS BASED ON CARBOXYMETHYLCELLULOSE
UDC 544.773.432:547.458.82
Abstract
The physicochemical properties (pH, electrical conductivity, relative viscosity, and surface tension) of carboxymethylated wood the paper studies the synthesis of polymer hydrogels based on carboxymethyl cellulose (CMC) using citric, malic, and lactic acids as cross-linking agents. Particular attention is paid to the influence of cross-linking conditions on the formation of the hydrogel structure and changes in the rheological properties of the reaction systems during synthesis. Samples were prepared with a CMC content from 1.96 to 9.09% by weight, with cross-linking agent concentrations in the range of 0.01–0.94%. The swelling degree, gel fraction, moisture content, swelling kinetics, and sorption capacity were studied, and IR spectra reflecting the features of the cross-linking reaction were recorded. The study of the rheological characteristics made it possible to identify the relationship between the degree of cross-linking and the viscoelastic properties of the systems, which is important for monitoring the hydrogel formation process. The optimal synthesis conditions were determined to be 4.76% CMC and 0.71% cross-linking agent. Malic acid was found to be the most effective cross-linking agent, providing the greatest stability and reproducibility of the hydrogel structure. IR spectroscopy studies of the products confirmed the predicted directions of chemical transformations. The obtained results facilitate the development of methods for controlling the CMC cross-linking process to create hydrogels with desired physicochemical properties.
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