Study On Nano-CaCO₃/PP Composites

The microscopic image of nanocomposite, the toughening mechanism and the modification of Elastomer (EPR)/PP by Nano-CaCO3 particles were systematically investigated in this paper. The choice of Nano-CaCOs modified by different surface reagents and the processing method of the experiment were discussed in this paper. The modification condition of Elastomer(EPR)/PP modified by Nano-CaCO3 was investigated by testing of impact strength tensile strength and bending modulus. The microscopic structure of EPR was described and discussed on the basis of PCM; the dispersion of Nano-CaCOs particles in the matrix was described and discussed based on the results of TEM; the crystallinity of the composite was discussed on the basis of the results of PLM, DSC and XRD. The relation between the storage period and the mechanical properties was also studied.The results of the experiments are: Nano-CaCOs could be dispersed uniformly in the composites at a nanometer scale with adequate processingtechnology; The toughness of the composite was improved dramatically while its tensile strength keep constant in the mean time. With the prolongation of storage period, the impact strength of composite with nano-CaCO3 was increased while the composite without nano-CaCO3 was decreased. The characterization and analysis of the microstructure of composite shows that nano-CaCO3 had been dispersed uniformly in the composite at a nanometer scale. With addition of nano-CaCO3, EPR was dispersed uniformly and finely in the composite. The addition of nano-CaCO3 functioned as adding more percent of EPR by volume; the crystal size in the composite was also refined, whereas the P -crystal could not find in the system.The investigation of the experiment has produced some references for both PP's modification and processing, which could be also valuable for further application of PP. The results of pilot-scale experiment show that the batch formula and the processing technique are feasible.