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Keywords:

  • antioxidant;
  • polymerization;
  • poly(propylene);
  • stabilization;
  • Ziegler-Natta catalyst

Abstract

Poly(propylene) is one the polymers with the widest range of commercial applications, though as all polymers, it is susceptible to degradation reactions. The addition of antioxidants to polymers is the main way to prevent or retard the degradation process. Extrusion is the most used industrial process to mix additives to the polymer, but this technique involves processing under high temperatures and shear, which causes polypropylene to degrade. Therefore, a Ziegler-Natta catalyst system based on MgCl2/TiCl4 was prepared with morphology control and the antioxidant was added directly in the polymerization medium, thereby producing spherical and stabilized PP.