The antioxidant activity of the different formulations was determined by the oxidation induction time (OIT) test determined by DSC. Approximately 2 mg of formulation was placed in an open aluminum pan, as described in the literature . For TPO formulations, the sample is heated to 200 °C at a rate of 10 °C min -1 under nitrogen, followed by an isotherm of 5 min. Nitrogen is then replaced by dry air for an isotherm at 200 °C for 300 min. For TPU formulations, after preliminary tests, the final temperature is set at 190 °C and the first isotherm (under nitrogen) lasts 5 min, until the heat flow is stabilized, after which nitrogen is replaced by air for 30 min. The OIT corresponds to the time elapsed between exposure to the oxidizing gas and the start of degradation represented by the appearance of an exothermic peak on the heat flow curves.