ANALYSIS OF THE MECHANICAL PROPERTIES OF BIODEGRADABLE FILMS MADE FROM BLENDS OF POLYLACTIC ACID (PLA) AND POLYESTERS BY BLOWN FILM EXTRUSION

摘要

Poly lactic acid (PLA) and aliphatic polyesters such as polybutylene succinate adipate random copolymer (PBSU-AD), have been studied for the production of biodegradable products using pure materials instead blends of both polymers. The main purpose of this research was to produce blown film from blends of PLA and PBSU-AD and determine how the mechanical properties change when the processing conditions are modified. It was found that films produced with 50% of each component presented competitive properties similar to those found in PE films. The increase in the blow-up ratio improves the tensile properties and tear resistance. The processability, film toughness and flexibility were improved with the addition of PBSU-AD. Higher ratios of PLA resulted in process instabilities.