Use of hydroxytyrosol as polypropylene stabilizer and as a potential active antioxidant

M. PELTZER, N. LÓPEZ, L. MATISOVÁ-RYCHLÁ, J. RYCHLÝ, A. JIMÉNEZ

Biodegradable Polymers and Sustainable Polymers (BIOPOL-2009)

NOVA Science Publishers, Inc

Año: 2011; p. 37 - 49

The use of natural antioxidants as stabilizer in polymer formulations has raised some interest in recent years making attractive their use in packaging applications. One of the main sources of such phenolic compounds is olive fruit which contains wide variety of bioactive components. Among them, hydroxytyrosol (HT) stands out as a high valuable product. The aim of this study was to evaluate the stabilizing performance of HT in polypropylene (PP) films as a potential polymer stabilizer and active additive. Oxidation Induction Time (OIT) of selected samples of polypropylene (PP) additivated with HT was determined by Differential Scanning Calorimetry (DSC) and Chemiluminescence (CL). In addition, the Onset Oxidation Temperature (OOT) and the apparent activation energy (Ea) were determined by DSC and thermogravimetric analysis (TGA), respectively. HT showed good performance as PP stabilizer at concentrations higher than 0.05 wt%, since ir was observed an increment in the OIT, OOT and Ea values. HT at concentrations higher than 0.5 wt% could be considered as active additive in PP films.