The Impact of Water on Polylactide – Polybutylene Adipinate Terephthalate Blends

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Abstract

Mixing in the melt followed by pressing, blends of polylactide — polybutylene adipate terephthalate of various compositions were obtained. The content of polybutylene adipate terephthalate in blends was 10, 20 and 30 wt. %. The effect of water on film samples at a temperature of 22 ± 2°C for 270 days was studied. After exposure to water, a change in morphology was detected: turbidity of the samples and the appearance of defects. The thermophysical characteristics before and after hydrolytic degradation were determined by differential scanning calorimetry. A decrease in the cold crystallization temperature in pure polylactide and with a low content of polybutylene adipate terephthalate, and the disappearance of the cold crystallization peak at a content of 20 and 30 wt. % of polybutylene adipate terephthalate were shown. The degree of crystallinity of polylactide after exposure to water tended to increase. Changes in the chemical structure of mixed samples were monitored by IR spectroscopy.

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About the authors

L. D. Selezneva

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

Author for correspondence.
Email: mariapdz@mail.ru
Russian Federation, Moscow; Moscow

M. V. Podzorova

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

Email: mariapdz@mail.ru
Russian Federation, Moscow; Moscow

Yu. V. Tertyshnaya

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

Email: mariapdz@mail.ru
Russian Federation, Moscow; Moscow

R. R. Romanov

Plekhanov Russian University of Economics

Email: mariapdz@mail.ru
Russian Federation, Moscow

A. A. Popov

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

Email: mariapdz@mail.ru
Russian Federation, Moscow; Moscow

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Supplementary files

Supplementary Files
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1. JATS XML
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2. Fig. 1. SEM photograph of a sample of PLA90 : PBAT10 film [16].

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3. Fig. 2. Photograph of the original PLA and after its exposure in water for 270 days.

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4. Fig. 3. Microphotographs of the initial PLA and PLA80 : PBAT20 composition before (a, c) and after 270 days of hydrolysis (b, d).

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5. Fig. 4. DSC thermograms of pure PLA samples and compositions PLA90 : PBAT10, PLA80 : PBAT20, PLA70 : PBAT30 (from bottom to top) before (black lines) and after their soaking in water (magenta lines) for 270 days.

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6. Fig. 5. Infrared spectra (MNPVO) of the initial PLA (1) and after its soaking in water for 270 days (2).

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7. Fig. 6. IR spectra (MNPHE) of the sample of PLA80 : PBAT20 composition - initial (1) and after its soaking in water (2) for 270 days.

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8. Fig. 7. IR spectra (MNPHE) of the sample of PLA60 : PBAT40 composition - initial (1) and after its soaking in water (2) for 270 days.

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