Investigation of the Influence of UV Radiation on Compositions of Polylactide with Graphite Nanoplates

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Composites of polyether polylactide (PLA) synthesized from natural raw materials with graphite nanoplates (GNP), which represent a new type of composite materials based on biodegradable polymers, were obtained by solid-phase method under the action of shear deformations. The porosity of composites was evaluated and their electrical and mechanical properties were studied. The effect of UV radiation on the molecular weight and molecular weight distribution of PLA in PLA-GNP composites of different compositions was investigated using the method of excision chromatography (EC), and the effect of the GNP nanofiller content on the change of their mechanical characteristics in the process of radiation was shown.

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作者简介

M. Gasymov

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: S.Rogovina@mail.ru
俄罗斯联邦, Moscow

S. Rogovina

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: S.Rogovina@mail.ru
俄罗斯联邦, Moscow

O. Kuznetsova

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: S.Rogovina@mail.ru
俄罗斯联邦, Moscow

E. Perepelitsyna

Federal State Research Center for Chemical Physics and Medical Chemistry, Russian Academy of Sciences

Email: S.Rogovina@mail.ru
俄罗斯联邦, Chernogolovka

V. Shevchenko

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences; Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences

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

S. Lomakin

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences; Emanuel Institute of Biochemical Physics, Russian Academy of Sciences

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

A. Berlin

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: S.Rogovina@mail.ru
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Dependence of dielectric permittivity of ′ compositions on frequency f at NPG concentrations of 0.1 (1), 0.25 (2), 1 (3) and 5 wt. % (4).

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3. Fig. 2. Dependence of conductivity of ac compositions on frequency f at NPG concentrations of 0.1 (1), 0.25 (2), 1 (3) and 5 wt. % (4).

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4. Fig. 3. Frequency dependence f of the imaginary part of the electric modulus M ″при of NPG concentrations of 0.1 (1), 0.25 (2), 1 (3), and 5 wt% (4).

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5. Fig. 4. MMR curves of PLA as a function of UV irradiation time: 1 - 0 h, 2 - 3 h, 3 - 24 h.

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6. Fig. 5. a - MMR curves of PLA-based compositions (1) containing 0.1 (2), 0.25 (3), 1 (4) and 5 wt. % (5) of NPG without UV irradiation; b - MMR curves of PLA-based compositions (1) containing 0. 1 (2), 0.25 (3), 1 (4) and 5 wt. % (5) of NPG under UV irradiation for 3 h; c - MMR curves of PLA-based compositions (1) containing 0.1 (2), 0.25 (3), 1 (4) and 5 wt. % (5) of NPG under UV irradiation for 24 h.

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7. Fig. 6. Effect of UV-irradiation time on Mw of initial PLA (1) and PLA in compositions with NPG of different composition. NPG content: 0.1 (2), 0.25 (3), 1 (4), 5 wt. % (5).

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8. Fig. 7. a - Dependence of modulus of elasticity E of compositions of initial PLA (1) and PLA-NPG compositions with NPG content 0.1 (2), 0.25 (3), 1 (4) and 5 wt. % (5) on UV-irradiation time; b - Dependence of ultimate strength σp of compositions of initial PLA (1) and PLA-NPG compositions with NPG content 0. 1 (2), 0.25 (3), 1 (4), 5 wt. % (5) as a function of UV-irradiation time; c - dependence of elongation at break р of compositions of initial PLA (1) and PLA-NPG compositions with NPG content of 0.1 (2), 0.25 (3), 1 (4), 5 wt. % (5) as a function of UV-irradiation time.

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