Abstract
In this paper the kinetics of thermal oxidation of isotactic polypropylene with some new mercaptotriazines is presented. Isothermal degradation of i-PP was studied by chemiluminescence in air at 180°C on polymer samples containing various concentrations of stabilizers (0.15, 0.25, 0.50 and 0.75 wt%). The antioxidant efficiencies in thermal protection of i-PP were assessed by means of temporal parameters (ti, t12 and tmax), oxidation rates (Voxmax), relative activities (A) and relative stabilities (S) relative to a standard (Irganox 565). The concentration constants that characterize the stabilization effect of triazinic antioxidants were calculated and linear correlation between OIT and σ-Hammett constants could be pointed out.
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