2001 Volume 37 Issue 8 Pages 309-315
The mechanical properties of polypropylene (PP) filled with CaCO3 and tale particles were studied. Hybridized CaCO3 (1.4mm)-talc (3.2mm) particles were newly prepared in the presence of stearic acid by using Henschel mixer at rotation speed above 2500 r.p.m.. Scanning electron microscopic observation showed that aggregates of talc particles were disintegrated during hybridizing process. The impact strength of PP filled with blended CaCO3-talc particles, prepared at rotation speed below 2000 r.p.m. , decreased significantly with decreasing CaCO3/talc ratio, whereas that of PP filled with hybridized particles remained relatively high. It was suggested that the homogeneous dispersion of the hybridized particles in PP improved the impact strength of the composites.
