Polypropylene/CaCO3 composites were homogenized in a twin-screw extruded and then injection molded into tensile bars. Six different fillers were used in a wide range of average particle sizes between 0.08 and 12 μm. Tensile and flexural properties were measured by standard techniques, while impact resistance was determined by instrumented impact testing. Results showed that aggregation of particulate fillers occurred when the particle size was smaller than a critical value. The strength and impact resistance decreased with increasing number of aggregates. Comparison of samples prepared by two different technologies showed that twin-screw extrusion and injection molding leads to relatively homogeneous composites.
|Journal||Journal of Macromolecular Science - Physics|
|Publication status||Published - Dec 1 1999|
ASJC Scopus subject areas
- Condensed Matter Physics
- Polymers and Plastics
- Materials Chemistry