Preparation and regulation of structural-mechanical properties of biodegradable films based on starch and agar

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.213226

Keywords:

biodegradable films, starch, agar, structure formation, mechanical properties, puncture resistance

Abstract

The problem of recycling polymer waste is one of the most actual problems. One way to solve this problem is to create biodegradable food packaging. By mixing solutions of starch and agar at different mass ratios of polymers in the presence of glycerol, biodegradable films are obtained. Their structural and mechanical characteristics are determined. It is shown that the values of strength, modulus of elasticity and puncture resistance of films are maximal at the mass ratio of agar/starch 7-9. A comparison of the roughness of the films obtained from starch, agar and their mixture showed that the greatest roughness is possessed by films based on starch. The introduction of agar into the films of starch leads to a significant reduction in their roughness.

To regulate the structural and mechanical properties of films, it is proposed to use Cа and Mg salts. The influence of Ca2+ and Mg2+ ions on the strength and deformation characteristics of biofilms was studied. It is shown that Ca2+ ions monotonically increase the strength characteristics of starch-agar films, while the curves of changes in these parameters in the presence of Mg2+ ions have maxima at a concentration of 0.5 %. The difference in the effect of Ca2+ and Mg2+ ions on the structural and mechanical properties of films is explained by the hydration degree of these ions.

The biodegradability of starch-agar films was controlled by changing their IR spectra. The most significant changes are observed in the intensity and localization of peaks corresponding to O-H, C-H and C-C bonds, which can be evidence of changes in the structure of films due to the destruction of the grid of hydrogen bonds and hydrophobic interactions, as well as the break of hydrocarbon chains and the destruction of the skeleton of carbohydrate molecules.

Supporting Agencies

  • This work was supported by the Ministry of Education and Science of the Republic of Kazakhstan
  • Project No АР05132126.

Author Biographies

Sagdat Tazhibayeva, Al-Farabi Kazakh National University Al-Farabi ave., 71, Almaty, Kazakhstan, 050040

Doctor of Chemical Sciences, Professor

Department of Analytical, Colloid Chemistry and Technology of Rare Elements

Bakyt Tyussyupova, Al-Farabi Kazakh National University Al-Farabi ave., 71, Almaty, Kazakhstan, 050040

PhD, Associate Professor

Department of Analytical, Colloid Chemistry and Technology of Rare Elements

Aigerim Yermagambetova, Al-Farabi Kazakh National University Al-Farabi ave., 71, Almaty, Kazakhstan, 050040

PhD Student

Department of Analytical, Colloid Chemistry and Technology of Rare Elements

Azymbek Kokanbayev, Al-Farabi Kazakh National University Al-Farabi ave., 71, Almaty, Kazakhstan, 050040

PhD, Professor

Department of Analytical, Colloid Chemistry and Technology of Rare Elements

Kuanyshbek Musabekov, Al-Farabi Kazakh National University Al-Farabi ave., 71, Almaty, Kazakhstan, 050040

Doctor of Chemical Sciences, Professor

Department of Analytical, Colloid Chemistry and Technology of Rare Elements

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Published

2020-10-31

How to Cite

Tazhibayeva, S., Tyussyupova, B., Yermagambetova, A., Kokanbayev, A., & Musabekov, K. (2020). Preparation and regulation of structural-mechanical properties of biodegradable films based on starch and agar. Eastern-European Journal of Enterprise Technologies, 5(6 (107), 40–48. https://doi.org/10.15587/1729-4061.2020.213226

Issue

Vol. 5 No. 6 (107) (2020): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2020 Sagdat Tazhibayeva, Bakyt Tyussyupova, Aigerim Yermagambetova, Azymbek Kokanbayev, Kuanyshbek Musabekov

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