Writer: Qian Qi, Wu Wei, Lv Xianli
Publication: China Plastics Industry. 2002, 30(6):34-37
Abstract: Conglomeration, dispersion and interface behavior of PP/nano-SiO2 composites, in which nano-SiO2 particles were treated by different surface treatments, were studied by general capillary rheometer and high-pressure capillary rheometer. The results showed that the thickness of interface layers between PP and nano-SiO2 particles was increased, cushion breaker was appeared in phase interface, when nano-SiO2 particles were treated by coupling agent and whereafter were wrapped by dispersant of long chain molecule. With the increase of the space of nano-SiO2 particles, the conglomeration of nano-SiO2 particles became loose, and frication resistance between nano-SiO2 particles decreased, so did the loss of melt flow behavior. The melt flow behavior of PP/ nano-SiO2 composite reduced with the increase of the content of nano-SiO2. When the mass fraction of nano-SiO2particles was about 3%, the melting rheological behavior of this composite was approximate to pure PP, and the melting flow behavior did not reduce obviously in the range of shear rate of extrusion or injection processing.
