Zhang Guizhen

Rheological properties of PP/CaCO3 micron-nano composite blends processing based on elongation rheology via vane extruder

This work aimed to study, for the first time, the rheological properties of the melt blending of PP/micron-CaCO3 and PP/nano-CaCO3 composite processing based on elongation rheology by a novel vane extruder to toughen PP. The rheological behavior of the blends was studied by capillary rheometer. The results show that: PP/CaCO3 Micron-nano copolymer blends are pseudo plastic fluid. The apparent viscosity initially increases with the increasing of feller. The change of the apparent viscosity also depends on the filler type which proves difference when the blends are on the low shear rate. When the shear rate is low, the apparent shear viscosity of micron-nano composite material is more sensitive to shear rate. For PP/micron-CaCO3 composite blend, the non-Newtonian index shows a trend of gradually increasing. In PP/nano-CaCO3 composite blend, the non-Newtonian index changed little in general with the increase of nano-filler content.

Preparation and properties of PA6/CSW composites via vane extruder

The PA6/CSW composites were prepared with a vane extruder in this work, which is a novel polymer processing equipment dominated by elongational flow field. SEM microphotographs indicate that the whiskers were well dispersed in the polymer matrix under the elongational flow field of the vane extruder.The PA6/CSW composites were also characterized by DSC, Mechanical testing and Rheological measurements. The results show that the PA6/CSW composites have improved their tensile strength and modulus greatly.