Abstract
Differential scanning calorimetry and X-ray diffraction at wide and small angles were used to examine the biodegradable composites of poly-3-hydroxybutyrate with chitosan, produced by mixing of these polymers in a rotor disperser at 150°C. Samples of individual polymers and composites with 80, 40, and 20 wt % poly- 3-hydroxybutyrate were studied. It was found that the presence of chitosan in the composites leads to a change in the crystallite size of poly-3-hydroxybutyrate and to an increase in the large period in this polymer. Mixing of poly-3-hydroxybutyrate with chitosan affects the structural rearrangement in crystalline regions of poly-3-hydroxybutyrate under a high-temperature treatment. The effect of a high-temperature treatment of the composites via alternation of melting–crystallization cycles in the nonisothermal mode, when a sample is heated and cooled at the same constant rate of 8 deg min–1 in the range from 20 to 200°C and is annealed at a temperature of 150°C, was analyzed. This analysis suggests that, in composites of this kind, the intermolecular interaction between the components is a factor strongly affecting the structure of the crystalline regions and the mechanism of their rearrangement in the course of annealing. The mechanism of this interaction is discussed.
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Original Russian Text © L.S. Shibryaeva, O.V. Shatalova, A.V. Krivandin, Yu.V. Tertyshnaya, Yu.V. Solovova, 2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 9, pp. 1187−1198.
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Shibryaeva, L.S., Shatalova, O.V., Krivandin, A.V. et al. Specific structural features of crystalline regions in biodegradable composites of poly-3-hydroxybutyrate with chitosan. Russ J Appl Chem 90, 1443–1453 (2017). https://doi.org/10.1134/S1070427217090117
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DOI: https://doi.org/10.1134/S1070427217090117