Modification of mechanical properties of oriented polypropylene by ozone oxidation

The variation of mechanical, structural and dynamic parameters and MD of oriented PP were examined during ozone oxidation. It is assumed that the improvement of mechanical properties at the initial stage of oxidation is due to the crystallization of macromolecules which undergo further structure-formation after termination. Intensification of molecular interaction as a consequence of the biuld-up of functional groups containing oxygen has a certain effect on the improvement of mechanical properties. At more advanced stages of oxidation factors promoting the reinforcement of the polymer are overlapped by macromolecular terminations, which reduce mechanical parameters.