Abstract—
In this study the effect of ozone on the structural and dynamic characteristics of polymeric mixtures of polylactide–low density polyethylene (LDPE) of various compositions is investigated. It is shown by the method of electron paramagnetic resonance that the segmental mobility in the amorphous phase is higher in mixtures with a predominance of polyethylene. After ozone exposure at T = (20 ± 2)°C for 16 h, the correlation time of the probe rotation decreases for all samples. It is determined by differential scanning calorimetry that the melting point of polylactide decreases by 2–4°С, and the glass transition temperature, by 1–3°C; and at the same time, the degree of crystallinity increases by 3–6%. The thermophysical characteristics of LDPE are observed to decline.
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ACKNOWLEDGMENTS
This study was carried out with the instruments of the Center for Collective Usage (Emanuel Institute of Biochemical Physics, Russian Academy of Sciences) “New materials and technologies.” The authors are grateful to the Plekhanov Russian University of Economics for the financial support.
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Tertyshnaya, Y.V., Karpova, S.G. & Podzorova, M.V. Effect of Ozone on the Structure and Dynamics of Polylactide-Polyethylene Blends. Russ. J. Phys. Chem. B 15, 854–860 (2021). https://doi.org/10.1134/S1990793121050092
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DOI: https://doi.org/10.1134/S1990793121050092