Thermal Decomposition of Bio-Based Plastic Materials.

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.