| In the paper, PP/CaCO3, HDPE/CaCO3 and PP/SiO2 are produced by means of extruder machine, injection machine and blending principles. Effection powders of contents of ultra fine CaCO3 and ultra fine SiO2 on mechanical properties of blending system PP/CaCO3, HDPE/CaCO3 and PP/SiO2, influence of the ultra fine CaCO3 and ultra fine SiO2 on crystallization behavior and the dispersion mechanism are investigated. Against ultra fine powders of different coupling agent, both different coupling agent and compatibilizer and surface unteatment are filled performances of PP and HDPE of a comparative analysis. To explore compatibility mechanisms of blebds of the PP/CaCO3, HDPE/CaCO3 and PP/SiO2, The physical model of compatible mechanism of blends was also established.We have investigated the composites by means of mechanical testing, DSC, SEM, etc. The relation between the structure and property of the composites has been discussed in this thesis. We studied the ultra fine powders by means of LS particles size analysis, we also studied the modified ultra fine SiO2 and ultra fine CaCO3 by means of FT-IR.Research shows that interface adhesion, even dispersivity and the compatibility of ultra fine powders of surface modified SiO2 and CaCO3 are improved in matrix of HDPE and PP. Between matrix of polyolefine and ultra fine inorganic powder form the gradient interface layer after compatibilizer join, which make the the interface adhesion, even dispersivity and the compatibility of powders of ultra fine CaCO3 and SiO2 in blends of PP/CaCO3, HDPE/CaCO3 and PP/ SiO2 that cause further improves, The overall performance of blends of PP/CaCO3, HDPE/CaCO3 and PP/SiO2 also obtains the enhancement. Which provide important theoretical foundation for the deign, production and application of polyolefine/ultra fine inorganic powder composite.Finally, this paper summarizes the late development study on polymers filled by ultra fine powders.
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