The objective of this work is to substitute the dangerous products based on phthalates by bio-based plasticizers combinations in polyvinylchloride (PVC).For this purpose, two natural secondary plasticizers were synthesized by the sunflower oil epoxidation reaction and the esterification of epoxidized sunflower oil to obtain epoxidized sunflower oil (ESO) and. epoxidized sunflower oil methyl ester (ESOME) respectively. These new products were combined with two other primary bio-based plasticizers which are di-ester isosorbide (DEI) and acetyl tributyl citrate (ATBC). The formulations are prepared by mixing plasticizers combination and other additives with PVC resin. Then, blends are mixed and heated; films of plasticized PVC are obtained. Several techniques such as thermogravimetric analysis (TGA) in isothermal mode, internal mixer test and light transmission have been used to study the thermal, physicochemical and rheological properties in order to search for a synergism of properties between these combinations of plasticizers.
