This study introduces a new, eco-friendly way to improve biodegradable plastics using natural additives made from walnut shells. These plastics, made from materials like PLA and PBAT, are already used in things like food packaging and farming products—but they can be improved with added antioxidant and UV-resistant properties.
Researchers used a green method called microwave-assisted extraction to pull powerful antioxidants from walnut shells, creating an extract rich in natural compounds like flavonoids and fatty acids. They tested different extraction conditions and found the best results using a low-alcohol solution, short heating time, and moderate microwave power.
This walnut extract was then blended into the plastic at small amounts (0.5% and 1.5%) to create thin film samples. The results were impressive: the new films had strong antioxidant properties and resisted damage from UV light—even after a week of exposure. The higher 1.5% concentration made the plastic much more stable in sunlight, without weakening its strength.
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