Poly(lactic acid) Matrix Reinforced with Diatomaceous Earth

Area of Science:

• Materials Science
• Polymer Science
• Sustainable Materials

Background:

• Poly(lactic acid) (PLA) is a biodegradable polymer aligning with circular economy principles.
• Diatomaceous earth (DE) is a natural, siliceous material suitable for reinforcing polymers.
• Combining PLA and DE offers a pathway to eco-friendly composite materials.

Purpose of the Study:

• To prepare and characterize biodegradable composites of poly(lactic acid) reinforced with diatomaceous earth.
• To investigate the structural integrity and interfacial adhesion between PLA and DE.
• To evaluate the impact of DE addition on the thermal and mechanical properties of PLA.

Main Methods:

• Composite preparation via extrusion process.
• Microstructural analysis using Scanning Electron Microscopy (SEM).
• Thermal properties assessed by Differential Scanning Calorimetry (DSC).
• Mechanical properties including Young's modulus, tensile strength, and elongation to failure were measured.

Main Results:

• SEM revealed the distribution of DE within the PLA matrix and assessed matrix-filler adhesion.
• DSC indicated changes in PLA crystallinity with varying DE content.
• Mechanical testing demonstrated the effect of DE reinforcement on PLA's tensile properties.

Conclusions:

• PLA-DE composites were successfully fabricated, demonstrating good matrix-filler interaction.
• DE reinforcement influences the crystallinity and mechanical performance of PLA.
• The developed composites show potential for diverse applications within the circular economy framework.