Toughening Of Polypropylene With Elastomer/Inorganic Rigid Particles Core-Shell Morphology

Preparation of Polypropylene composites is one of the main methods to realize high properties of PP. As both PP/elastomer and PP/inorganic rigid particles binary composites couldn't enhance the toughness and strength of PP together, this paper, which is sponsored by Shaanxi Province Science Fund, amis at improving the toughness of PP plastics. The surface modification of inorganic rigid particles and its characterization were studied. The relationship between the structure and properties of PP/elastomer/CaCO₃ ternary composites was also discussed. The main purpose of this paper is to improve the toughness and strength of PP ternary composites via the elastomer/particles core-shell encapsulation morphology.In this paper, a novel kind soft interface layer POE-g-MAH was prepared through solution method. FTIR and IGC technology were used to study the surface reaction and surface energy change of CaCO₃ after surface modification. PP composites were prepared by the twin screw extrusion and molding process and then the mechanical properties and morphology of PP ternary composites were investigated by the mechanical performance test and SEM technology respectively.The main conclusions of this paper are as follows:The characterization of CaCO₃ before and after surface modification and its dispersive component of the surface energy were studied by IGC. The results indicated that the change of the dispersive component of the surface energy as increasing temperature became stable when with coupling agents or POE-g-MAH, which improved the dispersion of rigid fillers and the compatibility between CaCC>3 and polymer. It could also be deduced from the IGC results that the monolayer coverage is around 1.9% for the CaCO₃ treated with titanate coupling agents NDZ101.Compared to the physical absorption layer on CaCO₃ surface by the coupling agents, there was obvious chemical reaction between POE-g-MAH and CaCO₃ via FTIR, which resulted the elastomer encapsulation layer and the core-shell structure in the PP/POE-g-MAH/CaCO₃ ternary composites.The mechanical performance tests indicated that PP/POE-g-MAH/PP system had a much better toughness than PP binary composites or other PP/POE/CaCO₃ systems. The Izod notched impact strength of PP/POE-g-MAH/CaCO₃ system (55/15/30)...