The synthesis of new materials with optimized properties is constantly advancing in Materials Science. In recent decades, polymer blends made up of natural polymers with synthetic polymers have aroused considerable interest among researchers as they are a simple, practical and low-cost alternative to be used in the packaging sector. The objective of this work consists of the preparation and characterization of polymeric blends consisting of biodegradable polymer, poly(3-hydroxybutyrate( (PHB) and synthetic polymer, low-density polyethylene (LDPE), aiming to evaluate the effect of different PHB contents on the morphology and thermal properties of LDPE blends prepared by melting.