Biodegradable Polyester Materials Containing Gallates.

Area of Science:

• Polymer Science
• Materials Science
• Green Chemistry

Background:

• Gallates are established antioxidants in food and cosmetics.
• Biodegradable polyesters such as polylactide (PLA) and polyhydroxyalkanoate (PHA) are gaining traction as sustainable materials.
• The use of gallates as stabilizers in biodegradable polymers has not been previously explored.

Purpose of the Study:

• To develop pro-ecological materials by incorporating gallates into biodegradable polyesters (PLA and PHA).
• To evaluate gallates as stabilizers and aging indicators for these biodegradable polymers.
• To investigate the antioxidant capacity and thermal stability of various gallates (ethyl, propyl, octyl, lauryl).

Main Methods:

• Characterization of gallate properties: antioxidant capacity and thermal stability.
• Analysis of polymer materials: gallate migration, SEM microscopy, DSC, X-ray diffraction, mechanical properties, surface free energy.
• Assessment of material changes after UV exposure, thermooxidation, and weathering, including color change determination.

Main Results:

• Gallates exhibited significant antioxidant properties and good thermal stability.
• High oxidation temperatures of gallates suggest their suitability as stabilizers.
• The incorporation of gallates into PLA and PHA did not negatively impact the tested properties.

Conclusions:

• Gallates are effective stabilizers for biodegradable polyesters due to their antioxidant capacity and thermal stability.
• Biodegradable polyesters containing gallates represent an eco-friendly alternative to conventional petrochemical packaging.
• This research paves the way for novel, sustainable polymer applications.