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Chemical Papers

, Volume 73, Issue 5, pp 1121–1134 | Cite as

Biodegradability of blends based on aliphatic polyester and thermoplastic starch

  • Vesna Ocelić BulatovićEmail author
  • Dajana Kučić Grgić
  • Miroslav Slouf
  • Aleksandra Ostafinska
  • Jiri Dybal
  • Antun Jozinović
Original Paper
  • 349 Downloads

Abstract

In this work, biodegradable aliphatic polyester blends of polycaprolactone and polylactide were melted and blended with a natural and biodegradable thermoplastic starch (TPS). The TPS employed in this study was obtained by plasticization of isolated wheat starch using glycerol as plasticizer. Morphology as well as thermal properties of the blends was investigated, and water vapor permeability as a barrier property was also monitored. The biodegradability of the biodegradable blends was performed by a composting process on laboratory scale. The composting process was conducted in an adiabatic closed reactor for 21 days and during the composting process, the temperature, pH value, % moisture and volatile matter and evolved CO2 were monitored. Biodegradation of the blends was determined by weight loss, as well as monitoring of morphological surface change. The thermophilic phase prevailed in the composting process, indicating intensive biodegradation of substrate as well as biodegradation of investigated ternary blends. Since microorganisms use starch as a carbon source, addition of TPS causes considerable acceleration of biodegradation of ternary blends due to higher water vapor permeability as a result of the hydrophilic nature of starch. The thermoplastic starch was first degraded within the blend, which was facilitated access to the microorganisms of other ingredients in the blend, encouraging the biodegradation of other components.

Keywords

Aliphatic polyester Thermoplastic starch Biodegradation Composting process 

Notes

Acknowledgements

This study was funded by the University of Zagreb, Croatia (Grant no. 110001/2013). Electron microscopy at the Institute of Macromolecular Chemistry was supported by projects TE01020118 (Technology Agency of the CR) and POLYMAT LO1507 (Ministry of Education, Youth and Sports of the CR, program NPU I).

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Supplementary material

11696_2018_663_MOESM1_ESM.pdf (679 kb)
Supplementary material 1 (PDF 678 kb)

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  1. 1.Faculty of Chemical Engineering and TechnologyUniversity of ZagrebZagrebCroatia
  2. 2.Institute of Macromolecular Chemistry, Academy of Sciences of the Czech RepublicPrague 6Czech Republic
  3. 3.Faculty of Food TechnologyUniversity of Josip Juraj Strossmayer OsijekOsijekCroatia

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