Thermooxidative stability of polypropylene under the simultaneous action of high pressure and shear deformation

Abstract

The thermooxidative stability of PP is enhanced after the joint action of high pressure and shear deformation. The higher the pressure, the more marked is the observed effect. By the introduction of a reactive monomer we obtained a longer induction period and a lower rate of oxidation, while the introduction of amorphous SiO 2 resulted in a lengthening of the induction period with no change in the rate of oxidation.