Weakly Cross-Linked Anionic Copolymers: Kinetics of Swelling and Water-Retaining Properties of Hydrogels
Iliasov L. Shibaev A. Panova I. Kushchev P. Philippova O. Yaroslavov A.
August 2023Multidisciplinary Digital Publishing Institute (MDPI)
Polymers
2023#15Issue 15
Six cross-linked copolymers consisting of sodium acrylate, N-acrylamide, starch fragments and a cross-linker were synthesized, potentially suitable for use in agriculture as superabsorbents. The copolymers had the same content of carboxyl groups equal to 6.2 mmoles per 1 g of copolymer and the content of cross-linker (Q) varied from 0.04 up to 1 wt.%. The copolymers swelled in a pH 6.5 aqueous buffer solution thus giving hydrogel particles, which were characterized by a set of methods including gravimetry, rheometry, swelling pressure analysis, equilibrium centrifugation and water retention analysis with the following main conclusions. An increase in Q decreases the equilibrium degree of swelling. When swelling in a solid substrate, sand or soil, the equilibrium degree of swelling shows the maximum at Q = 0.14 wt.%. The cross-linking degree controls the swelling pressure of hydrogels and water-retaining properties of solid substrates with embedded hydrogels; in both cases, the maximum effects are observed at Q = 0.14 wt.%. These extreme dependences set the algorithm for synthesis of polymeric superabsorbents and optimization of their operational characteristics.
cross-linked polymers , hydrogels , rheology , sand , soil , swelling , water capacity , water retention
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Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russian Federation
Department of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russian Federation
Department of Chemistry, Karaganda E.A. Buketov University, University Street 28, Karaganda, 100028, Kazakhstan
Department of Chemistry, Voronezh State University, Universitetskaya Sq. 1, Voronezh, 394018, Russian Federation
Department of Chemistry
Department of Physics
Department of Chemistry
Department of Chemistry
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