OBTAINING AND MODIFICATION OF INTERPENETRATING NETWORKS BASED ON NATURAL POLYMERS AND ACRYLIC ACID DERIVATIVES

Kussainova G.K. Zhunusbekova N.M. Iskakova T.K. Chinibaeva N.S. Khudaibergenov N.S.
2022 Ivanovo State University of Chemistry and Technology

ChemChemTech
2022 #65 Issue 3 83 - 90 pp.

To achieve a synergistic effect obtained by a combination of useful properties of biopolymers and vinyl monomers, crosslinked hydrogels based on chitosan, acrylic acid and its derivatives, 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate, were obtained by radical polymerization of low molecular weight monomers in the presence of bifunctional crosslinking agents. The synthesis was carried out in the presence of a cross-linking agent (N, N-methylenebisacrylamide) at a temperature of 70 °C. By means of gravimetric method it was found that the swelling capacity and mechanical strength of crosslinked structures completely depend on the ratio of the initial reagents. The critical values of the swelling coefficient of the samples in water and ethyl alcohol have been determined. It was shown that the swelling coefficient in ethyl alcohol is much lower than in water. The appearance of absorption bands of the carbonyl and amide groups in the IR spectra of the obtained cross-linked structures confirms the formation of the hydrogel. The formation of polymeric hydrogels confirmed by the presence of characteristic singlet signals of the amino saccharide molecule and multiplet signals of the methylene groups of the main and side chains in the ¹H NMR spectra. It was found that in 2-hydroxyethyl methacrylate hydrogel, the ratio of the number of structural units of chitosan to the total number of structural units formed by the corresponding acrylate is 1:40. The hydrolysis of copolymers was studied and the optimal conditions for its implementation have been developed. It was found that the most favorable temperature is 60 °C and the holding time is 30 min. Scanning microscopy has shown that polymer systems based on chitosan are porous, which is largely due to the swelling ability of cross-linked biopolymers with synthetic polymers in water and aqueous media. Thermogravimetric analysis confirmed that hydrogels based on natural biopolymer and vinyl monomers are quite stable and its decomposition begins at 280 °C and reaches a maximum at 300-320 °C.

hydrogel , interpenetrating networks , polymers , swelling

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Institute of Chemical and Biological Technologies, Satbayev University, K.I. Satpayev st., 22, Almaty, 050013, Kazakhstan
Department of Academic Affairs, Satbayev University, K.I. Satpayev st., 22, Almaty, 050013, Kazakhstan
Kazakh National Pedagogical University named after Abai, Dostyk ave., 13, Almaty, 050010, Kazakhstan

Institute of Chemical and Biological Technologies
Department of Academic Affairs
Kazakh National Pedagogical University named after Abai

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