Abstract
Composite macroporous poly(vinyl alcohol) (PVA) cryogels have been prepared by cryogenic treatment (freezing at −20°C for 12 h followed by defrosting at a rate of 0.03°C/min) of dispersions of chitosan particles swollen in an aqueous 120 g/L PVA solution. The elasticity moduli and fusion temperatures have been determined for corresponding samples, and their microstructure has been investigated by optical microscopic examination of their thin sections. The rigidity and heat endurance of the PVA-chitosan composite cryogels have been shown to increase with filler concentration. In addition, the rheological properties of initial dispersions have been studied and the appearance of adhesion contacts between discrete and continuous phases has been revealed already at the stage of dispersion preparation. The optical microscopic investigations of the morphological features of the initial dispersions and the microstructure of the composites have established a relatively uniform distribution of filler particles in the bulk of composite cryogels. It has been shown that chitosan particles incorporated into the matrix of the macroporous PVA cryogel are capable of sorbing heavy metal ions—in particular, bivalent copper ions—from aqueous solutions.
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Original Russian Text © E.A. Podorozhko, I.A. Lunev, A.N. Ryabev, N.R. Kil’deeva, V.I. Lozinsky, 2015, published in Kolloidnyi Zhurnal, 2015, Vol. 77, No. 2, pp. 197–206.
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Podorozhko, E.A., Lunev, I.A., Ryabev, A.N. et al. A study of cryostructuring of a polymer system. 39. Poly(vinyl alcohol) composite cryogels filled with chitosan microparticles. Colloid J 77, 186–195 (2015). https://doi.org/10.1134/S1061933X1502012X
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DOI: https://doi.org/10.1134/S1061933X1502012X