Abstract
The effect of introduced aged low density polyethylene (LDPE-A) on structure and properties of mixed blends based on polylactide (PLA) and low density polyethylene (LDPE) was revealed. The accumulation of carbonyl groups in the LDPE matrix after thermal aging was detected by IR spectroscopy. Thermophysical characteristics of such polyethylene (PE) and its ternary blends were estimated using differential scanning calorimetry and thermogravimetric analysis. It was shown that the melting temperatures of components of the blends practically do not change, while the degree of crystallinity of PLA decreases by 2–12% upon increasing the content of LDPE-A. Physico-mechanical characteristics of the polymer blends decrease upon the addition of more than 30 wt.% of LDPE-A. Kinetic curves for the oxygen absorption were recorded at 80, 90, and 110 °C. It was shown that the addition of LDPE-A to a binary PLA—LDPE blend promotes the initial step of oxygen absorption, as well as the entire process of thermal oxidative degradation of the material.
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Published in Russian in Izyestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1791–1797, September, 2021.
The authors are grateful to the “New Materials and Technologies” Research Equipment Sharing Center at the Emanuel Institute of Biochemical Physics of the Russian Academy of Sciences and to the Research Equipment Sharing Center at the Plekhanov Russian University of Economics for the provided devices and the financial support.
This paper does not contain descriptions of studies on animals or humans.
The authors declare no competing interests.
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Podzorova, M.V., Tertyshnaya, Y.V. Kinetic patterns for thermal oxidation of binary and ternary blends based on polylactide and polyethylene. Russ Chem Bull 70, 1791–1797 (2021). https://doi.org/10.1007/s11172-021-3284-2
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DOI: https://doi.org/10.1007/s11172-021-3284-2