Abstract
Formation conditions are studied for bionanocomposite films prepared by mixing cationic chitosan with negatively charged nanoparticles of a synthetic clay (saponite) followed by gradual increasing of the charge of macromolecules by decreasing the pH of a medium. The data on the swelling of the bionanocomposite films in water are used to determine the stoichiometric ratio between the concentrations of macromolecules and nanoparticles that provides the most intense electrostatic interactions stabilizing the films. Their properties and structure are investigated by means of scanning electron microscopy, dynamic thermomechanical analysis, and small-angle X-ray scattering. The films are shown to occur in a glassy state and undergo a number of phase transitions, the temperatures of which depend on the chitosan-to-saponite concentration ratio. In particular, their glass transition temperature increases from 62 to 175°C when passing to the stoichiometric composition. The bionanocomposite films are found to have a layered structure. The layers are, in turn, composed of highly uniform microsized plates 20–30 nm thick. Small-angle X-ray scattering shows a structural order with a periodicity of 1.78 nm. The structure of the bionanocomposite films is discussed.
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Original Russian Text © Yu.A. Shchipunov, S.A. Sarin, V.E. Silant’ev, I.V. Postnova, 2012, published in Kolloidnyi Zhurnal, 2012, Vol. 74, No. 5, pp. 663–672.
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Shchipunov, Y.A., Sarin, S.A., Silant’ev, V.E. et al. Self-organization in the chitosan-clay nanoparticles system regulated through polysaccharide macromolecule charging. 2. Films. Colloid J 74, 636–644 (2012). https://doi.org/10.1134/S1061933X12050109
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DOI: https://doi.org/10.1134/S1061933X12050109