Study Of Matrix Property On Toughening Effect Of Polypropylene Composites

The polypropylene (PP) is one kind of general plastics. It has many good performances, such as low density, good heat resistance and corrosion resistance, etc. But, it has poor impact properties at low temperature, low weatherability and poor coloring, etc. These limit its application. In order to improve its properties, PP is toughed by elastomers such as polypropylene/ethylene-propylene-diene (EPDM)、SBS、EPR、EVA、BR, etc. Among the elastomers, EPDM is the one which is the most widely used.In this paper, the mechanical properties, flowability and morphological structure of PP/EPDM blends based on the content of Dicumyl peroxide (DCP) and the content of EPDM were studied, which were according to DCP as dynamically cured agent, PP as matrix and EPDM as degradation agent.The peroxide was used to degrade PP/EPDM blend with different amount of DCP, and the effect of the matrix properties on the blend was studied. The study showed that the melt flow rate (MFR) increased evidently with increasing DCP content, and the impact strength decreased correspondingly. The SEM photographs showed that the dispersed phase particle size increased largely.The mechanical properties, flowability and morphological structure of degraded PP/EPDM blends based on the content of EPDM were studied; the results showed that the MFR of the blends was decreased with the increment of EPDM. The Impact strength of the blends was increased with the increment of EPDM and the yield stress of the blends was decreased. The SEM showed that the EPDM particle was homogeneous distribution in the matrix.