Abstract
For the first time, the synthesis of water-soluble copper-containing microcrystalline cellulose sulfates (Сu-MCS) has been performed by the ion exchange method. The composition of the products has been studied by chemical methods and X-ray spectral microanalysis. The copper content in the Сu-MCS samples was 12.6–14.1%. The absence of sodium in the resulting polymer indicates the complete substitution of the sodium cations by the copper cations in the sodium salt of MCC sulfate. The structure of the copper-containing sulfates of microcrystalline cellulose has been confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and electron paramagnetic resonance (EPR). According to the XRD method, Сu-MCS and Na-MCS have an amorphous structure in contrast to the original MCC samples, which have a high degree of crystallinity. The EPR data have demonstrated the formation of a pseudocrystalline structure of the copper-containing salt system in the Сu-MCS samples. As shown by atomic-force microscopy, the surface of the Сu-MCS films consists of homogeneous crystallites, which have a spherical or slightly extended form with the size of about 70 nm. The film surface is quite homogeneous in its phase composition and contains no impurities.
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Original Russian Text © A.V. Levdansky, N.Yu. Vasilyeva, N.G. Maximov, A.A. Karacharov, V.A. Levdansky, G.P. Skvortsova, B.N. Kuznetsov, L. Djakovitch, C. Pinel, 2017, published in Khimiya Rastitel’nogo Syr’ya, 2017, No. 3, pp. 55–61.
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Levdansky, A.V., Vasilyeva, N.Y., Maximov, N.G. et al. Synthesis and Study of Copper-Containing Polymers of Microcrystalline Cellulose Sulfates from Larch Wood. Russ J Bioorg Chem 44, 834–838 (2018). https://doi.org/10.1134/S1068162018070063
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DOI: https://doi.org/10.1134/S1068162018070063