Gamma-Irradiation Effect on Mechanical Properties of PP/EPDM Polymeric Blends

Polypropylene (PP)/elastomers blends have as purpose improving PP resistance and impact, in order to a more comprehensive use in automotive market. In this work it was assessed gamma-irradiation effect in polymeric blends from Polypropylene (PP) and EPDM elastomer. PP/EPDM blends were prepared on a twin screw extruder. Rubber contents ranged from 0 (zero) to 30% (thirty percent), in volume. Ionizing radiation is intended to change structure and properties of polymeric materials; applied doses varied within 5, 10, 15 e 20 kGy range. The blends were evaluated before and after irradiation doses, as per physical-mechanical, dynamic-mechanical and thermal properties. Compounds morphology was assessed by using Scanning Electronic Microscopy (SEM). For PP/EPDM 70/30 % blends, there was a slight decreasing in tensile and elongation at break, in function of radiation. By SEM analyses, it was possible to check surface of irradiated and non-irradiated samples, providing relevant information on topography and showing fiber structure propagation pattern related to the material.