Selective Particle Distribution and MechanicalProperties of Nano-CaCO_3/Ethylene-Propylene-DieneTerpolymer/Polypropylene Composites withHigh Content of Nano-CaCO_3

摘要

Ternary composite of nano-CaCO_3/ethylene-propylene-diene terpolymer (EPDM)/polypropylene (PP)with high content of nano-CaCO_3was prepared by two stepcompounding route, in which EPDM and nano-CaCO_3weremixed first, and then melt compounding with PP matrix.The influence of mixing time during the second compound-ing on distribution of nano-CaCO_3particles and the impactstrength of the ternary composite have been investigated. Itwas found that the Izod impact strength of compositedecreased with increasing mixing time. The observation oftransmission electron microscopy obviously showed thatnano-CaCO_3particles transported from EPDM to PP matrixfirstly and then from PP to the vicinity of EPDM dispersed