Improvement of Impact Resistant Property of Polypropylene Filled with Calcium Carbonate
Effect of Blending Method on Impact Resistance
2001 Volume 58 Issue 9 Pages 480-485
Details
2001 Volume 58 Issue 9 Pages 480-485
The impact resistant property of polypropylene (PP) could be improved by the addition offinely powdered calcium carbonate (CC), and the factors for the improvement were investigated including kind of PP and CC, and the blending process with a heat twin roller. PP with high melt viscosity showed excellent effects, and CC of 0.1-0.3 μm in diameter treated with fatty acid salts showed excellent effects. The blending process with a heat twin roller was also a significant factor. An addition of large amounts of CC to PP induced high melt viscosity due to breaking of second coaggulation of CC. These results suggest that the sufficient dispersion of powdery CC in the PP matrix was significant for the improvement of the impact resistant properties. However, SEM observation failed to relate the sufficient dispersion of powdery CC in the PP matrix with remarkable improvement of the impact resistant property.
