Dynamics of Degradation of Polylactide-Natural Rubber Compositions under the Influence of UV Irradiation

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The effect of ultraviolet radiation of various wavelengths (254 nm and 365 nm) on compositions based on polylactide with the addition of natural rubber was studied. It was found that the effect of the wavelength of 254 nm on the studied samples is much more active than 365 nm, which is characterized by a decrease in the melting temperature and the degree of crystallinity of polylactide in the compositions, as well as a deterioration in physical and mechanical properties. The IR spectroscopy method confirms the photodegradation process by changing the intensities of structurally sensitive polylactide and natural rubber bands.

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作者简介

M. Podzorova

Emanuel Institute of Biochemical Physics, Russian Academy of Sciences; Plekhanov Russian University of Economics

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Email: mariapdz@mail.ru
俄罗斯联邦, Moscow; Moscow

Yu. Tertyshnaya

Emanuel Institute of Biochemical Physics, Russian Academy of Sciences; Plekhanov Russian University of Economics

Email: mariapdz@mail.ru
俄罗斯联邦, Moscow; Moscow

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2. Fig. 1. Schematic diagram of polylactide degradation under the influence of ultraviolet radiation.

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3. Fig. 2. Variation of tactical characteristics (tensile strength (a) and relative elongation (b)) of PLA/NK samples before (1) and after (2) exposure to UV radiation with λ = 365 nm for 300 h.

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4. Fig. 3. Infrared spectra (MNPHE) of the 85PLA/15NA sample before (1) and after (2) exposure to UV radiation with λ = 254 nm for 100 h.

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5. Fig. 4. Infrared spectra (MNPHE) of 85PLA/15NA sample before (1) and after (2) exposure to UV radiation with λ = 365 nm for 300 h.

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6. Fig. 5. Microphotographs of 85PLA/15NA sample before (a) and after (b) exposure to UV radiation with λ = 254 nm) for 100 h.

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