Experimental investigation of long-term ultraviolet irradiation effects on a commerical biodegradable polymer

Plastic bags have become an integral part of modern society since their invention in 1960 by Sten Gustaf Thulin. However, the poor biodegradation ability of traditional plastics allows them to linger in the environment long after disposal which has resulted in the accumulation of plastic waste and the world is now facing the consequences of decades of plastic pollution. Biodegradable plastics have been developed as a potential eco-friendly solution to replace and substitute traditional plastics. These biodegradable plastics are polymers made from a blend of various organic materials and one of the common types available is Tapioca Starch-Poly (Lactic) Acid (TS-PLA). In this project, we aim to experimentally determine and characterize the long-term degradation effects of Ultraviolet (UV) light irradiation on the material properties of TS-PLA films. These properties include the physical, mechanical, molecular, and thermal properties of the material. Long term exposure is achieved using accelerated aging testing to maintain the timeframe allocated for this project. Long-term UV irradiation has a distinct and profound effect on Tapioca Starch – Polylactic Acid films which varies depending on the variant of UV light used. In general, UV light degrades the molecular structure of the material and causes various extents of changes in the material properties of TS-PLA films. This project will provide a greater understanding of how long-term ultraviolet irradiation can affect the degradation process of TS-PLA.Bachelor of Engineering (Mechanical Engineering