A Study of Cryostructuring of Polymer Systems. 43. Characteristics of Microstructure of Chitosan-Containing Complex and Composite Poly(vinyl alcohol) Cryogels,

Podorozhko, E.A.; Ul’yabaeva, G.R.; Tikhonov, V.E.; Grachev, A.V.; Vladimirov, L.V.; Antonov, Y.A.; Kil’deeva, N.R.; Lozinsky, V.I.

Авторы: Podorozhko E.A., Ul’yabaeva G.R., Tikhonov V.E., Grachev A.V., Vladimirov L.V., Antonov Yu A., Kil’deeva N.R., Lozinsky V.I.
Журнал: Colloid Journal
Том: 79
Номер: 1
Год издания: 2017
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 94
Последняя страница: 105
DOI: 10.1134/S1061933X16060119
Аннотация: The microstructure of complex and composite poly(vinyl alcohol) (PVA) cryogels containing water-soluble chitosan hydrochloride (ChHC) of dispersed particles of water-insoluble chitosan base (Ch), respectively, has been studied by optical microscopy and attenuated total reflection FTIR spectroscopy. The macroporous morphology of cryogels has been studied using preparations in the form of thin (~10μm) sec- tions and discs 1 mm thick. The introduction of non-gelling additives (NaCl and ChHC) into an initial PVA solution causes significant changes in the size and shapes of macropores in the complex cryogels formed by freezing–defrosting, as compared with the pores in the samples obtained under the same conditions without additives. The reasons for the changes are the process of phase segregation and the influence of low- and high-molecular-weight electrolytes on crystallization of ice, which plays the role of a porogen upon cryo- tropic gelation of aqueous PVA solutions. As a result of an alkaline treatment of the complex cryogels, which transforms ChHC into Ch, microcoagulation of chitosan yields discrete, almost spherical, particles with sizes of about 1–5 μm. IR spectral studies have shown that concentration gradients of the gelling and nongelling polymers arise along the thickness of the gel discs, with PVA concentration prevailing near the lower surface and ChHC or Ch concentration dominating near the upper surface of the disc.
Добавил в систему: Тихонов Владимир Евгеньевич

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A Study of Cryostructuring of Polymer Systems. 43. Characteristics of Microstructure of Chitosan-Containing Complex and Composite Poly(vinyl alcohol) Cryogels,статья

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