Studies of the effect of titanate coupling agent on the performance of polypropylene–calcium carbonate composite

Abstract

Composites of polypropylene—CaCO3 coated with isopropoxy triisostearoyl titanate have been prepared on Buss Ko-Kneader. These composites have been evaluated for mechanical properties, melt index, dispersion, and adhesion of polymer to filler using the scanning electron microscope. Calcium carbonate being a platelike substance with low aspect ratio results in composites having inferior tensile properties but superior impact characteristics. Uniform dispersion of filler in the composite and long alkyl chains of the coupling agent provide additional advantages such as improved melt index, higher tensile elongation, and better optical properties.