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Thermal Decomposition of Bio-Based Plastic Materials.

Inés Oliver1, Juan A Conesa1,2, Andres Fullana1,2

  • 1Institute of Chemical Process Engineering, University of Alicante, Ap. 99, 03080 Alicante, Spain.

Molecules (Basel, Switzerland)
|July 13, 2024
PubMed
Summary

This study analyzes the thermal decomposition of thermoplastic starch (TPS) and polylactic acid (PLA) using thermogravimetry. Findings reveal distinct kinetic models for TPS and PLA, crucial for optimizing bio-based polymer applications.

Keywords:
bioplasticcircular economypyrolysisthermoplastic starch (TPS)waste management

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Sustainable Materials

Background:

  • Bio-based polymers like thermoplastic starch (TPS) and polylactic acid (PLA) are crucial for sustainable development.
  • Understanding their thermal decomposition is vital for processing and application.
  • Existing research often lacks detailed kinetic analysis under various conditions.

Purpose of the Study:

  • To investigate the thermal decomposition behavior of TPS and PLA under varying heating rates.
  • To establish kinetic models for TPS and PLA decomposition.
  • To analyze the influence of components and additives on TPS thermal stability.

Main Methods:

  • Thermogravimetry (TG) analysis was employed.
  • Experiments were conducted under a nitrogen atmosphere with varying heating rates.
  • Kinetic modeling was applied to analyze decomposition fractions.

Main Results:

  • Thermoplastic starch (TPS) decomposition was modeled using three distinct fractions.
  • Polylactic acid (PLA) exhibited a simpler kinetic behavior, modeled by a zero-order fraction.
  • Individual contributions of starch, glycerin, and polyvinyl alcohol (PVA) to TPS decomposition were analyzed.

Conclusions:

  • The study provides a detailed kinetic understanding of TPS and PLA thermal degradation.
  • Optimized processing conditions and material behavior prediction are facilitated.
  • Insights into TPS thermal stability with varied starch sources and calcium carbonate additives were gained, suggesting diverse industrial applications.