Effect of UV-Irradiation and Ozone Exposure on Thermal and Mechanical Properties of PLA/LDPE Films

Abstract. The mechanical properties of polymer composites based on polylactide vary significantly over a wide range values. It has been established that photodegradation low-density polyethylene – blends occurs both in the amorphous and crystalline phase PLA matrix, which leads to deterioration studied mixtures. Ozonolysis affects strength parameters polylactide-polyethylene samples as well photodegradation. By differential scanning calorimetry it is determined melting point decreases by 2-4 °C, glass transition temperature - 1-3 while degree crystallinity increases 3-6%. In process ozonolysis, thermophysical characteristics PLA/LDPE have changed.