Filled compositions of polylactide (PLA) with a reduced graphene oxide (RGO) at various components ratios were obtained by two independent methods: the solid-phase mixing of components under the action of shear strains and the liquid-phase synthesis in a chloroform solution with ultrasonic stirring. The influence of the structure of formed composites on the complex of their properties was studied. The method of scanning electron microscopy showed the formation of aggregates of RGO nanoparticles during the synthesis of compositions in the liquid phase, leading to a decrease in their strength and electrical characteristics. A comparative study of the thermophysical characteristics of polylactide in the compositions obtained by the solid- and liquid-phase methods was carried out, the corresponding temperatures and heats of thermal transitions were determined, and the crystallinity of the compositions was calculated. The sharp drop observed in the crystallinity of PLA in the compositions synthesized in the solid phase was caused by amorphization of the polymer under the action of shear strains and by a decrease in the segmental mobility of macromolecules under these conditions.
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 58, No. 6, pp. 1207-1224, November-December, 2022. Russian DOI: https://doi.org/10.22364/mkm.58.6.07.
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Rogovina, S.Z., Gasymov, M.M., Lomakin, S.M. et al. Influence of the Method of Obtaining Filled Polymer Nanocomposites of Polylactide Reduced Graphene Oxide on Their Properties and Structure. Mech Compos Mater 58, 845–856 (2023). https://doi.org/10.1007/s11029-023-10073-2
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DOI: https://doi.org/10.1007/s11029-023-10073-2