Rhysicochemical and rheological properties of cryogels produced from aqueous solutions of polyvinil alcohol

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Abstract

A research-based mechanism for cryostructuring aqueous solutions of polyvinyl alcohol, i.e., converting solutions from a fluid state into elastic bodies (cryogels), is proposed. In addition to the theoretical substantiation of the mechanism, experimental results of rheological and spectral studies of the cryogels obtained are also presented. An explanation is given for the significant difference between the cryostructuring temperature of an aqueous solution of polyvinyl alcohol and the melting temperature of formed elastic cryogels.

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About the authors

V. N. Manzhai

Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: mang@ipc.tsc.ru
Russian Federation, 634055 Tomsk

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Supplementary files

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2. Fig. 1. Fragment of intramolecular “cross-linking” of the PVA chain with glyoxal.

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3. Fig. 2. Fragment of intermolecular “cross-linking” of adjacent PVA chains.

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4. Fig. 3. A fragment of a concentrated PVA solution, consisting of three loose and mutually intertwined balls of macromolecules, before and after freezing.

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5. Fig. 4. Freeze-thaw process: (1) aqueous polymer solution; (2) formed cryogels.

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6. Fig. 5. Hydrolysis of polyvinyl alcohol cryogel “cross-linked” with glyoxal.

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7. Fig. 6. Change in the dynamic viscosity of the medium over time when dissolving a sample of a kergel of the composition (water–PVA 8%–GO5%) in excess water at T = 20°C and a shear rate of 450 s–1 on the wall of the cylinder of a rotational viscometer

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8. Fig. 7. Fragment of a two-component cryogel with a close arrangement of adjacent polymer chains at the sites of their chemical “cross-linking” (C–O–C).

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9. Fig. 8. Dependence of elasticity of PVA cryogels on the number of “freezing–thawing” cycles (n): (1) PVA 5 wt. %; (2) PVA 10 wt. %

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10. Fig. 9. Cryogel samples after the first freeze-thaw cycle and the same pre-deformed samples after a repeated cycle: (a) the original cryogel sample after the first cryostructuring cycle; (b) fixed bending strain after a repeated cryostructuring cycle; (c) the original cryogel sample after the first cryostructuring cycle; (d) compressive strain during a repeated cryostructuring cycle; (e) compressed sample and fixed sample after a repeated cryostructuring cycle.

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