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Unprecedented high percentage of food waste powder filler in poly lactic acid green composites: synthesis, characterization, and volatile profile

  • Teresa CecchiEmail author
  • Arianna Giuliani
  • Federica Iacopini
  • Carlo Santulli
  • Fabrizio Sarasini
  • Jacopo Tirillò
Short Research and Discussion Article

Abstract

The attractive qualities of plastics lead us, around the world, to an enormous need for plastic goods, which results in their unsustainable overconsumption. Bio-based products are the core concept of circular economy, yet this sector suffers from the high cost of their production. In practice, biopolymers, such as polylactic acid (PLA), are still limitedly used, due to their expensiveness and not outstanding technological properties. A circular and sustainable solution would be to use waste from the food industry as filler that contributes to reduce the cost of PLA-based materials, thereby encouraging their widespread use. At the same time, this would be a circular approach to wisely upgrade food waste and prevent pollution. Ceramic food waste powder fillers from egg shells and from mussel shells were compounded with PLA at 180 °C to obtain composites, which contain an unprecedented high amount of filler, equal to 140 over 100 parts of PLA. We analyzed volatile organic compounds emitted from PLA and, for the very first time, from its composites via headspace-solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS). The molecular fingerprint of the volatiles comprises only three aldehydes, a ketone, and two lactides. Volatiles typical of fossil plastics, that are causative factors of hormone disruption or reproductive dysfunction, are effectively missing. Scanning electron microscopy, used to examine the structure of the composite, indicates that both the egg shells and the mussel shells are suitable fillers, in that they form a sufficiently strong interface with the polymer.

Keywords

Waste upcycling PLA composites Mussel shells Egg shells Volatile profile SEM surface characterization 

Notes

Acknowledgments

We thank Margherita Bonanni for the helpful support.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Chemistry and Materials DepartmentITT MontaniFermoItaly
  2. 2.School of Architecture and DesignUniversità di CamerinoAscoli PicenoItaly
  3. 3.Deapartment of Chemical Engineering, Materials and EnvironmentUniversità di Roma-La SapienzaRomeItaly

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