Effect of Twin-Screw Extruder Design and Process Conditions on Ultrafine CaCO3 Dispersion into PP
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M. Bories
Abstract
Highly filled calcium carbonate (CaCO3)/polypropylene (PP) blends were compounded using an intermeshing corotating twin-screw extruder. The effect of screw configuration, rotation speed, flow rate, filler feed port position and barrel temperature on dispersion of calcium carbonate into polypropylene was investigated. A method based on image analysis of optical transmission micrographs obtained from 25 micron thick films was found to be quick and reliable for evaluating the state of dispersion in the filled systems. The dispersion state affected the mechanical performance of the systems. In particular, falling weight and unnotched Izod impact resistance decreased significantly as dispersion got poorer. Mechanical properties were correlated with the relative volume concentration of agglomerates in the blend.
© 1999, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Editorial
- In Memory of Carl Klason (1938–1997)
- Mixing/Screw Extrusion
- Structuring of Interface-modified Polymer Blends
- Mixing Homologous High Viscosity Ratio Polymer Blends in Converging Flow
- The Effect of Miscibility on Rheological and Mechanical Properties of PCL/SAN Blends
- Effect of Twin-Screw Extruder Design and Process Conditions on Ultrafine CaCO3 Dispersion into PP
- Characterization of the Behavior and Blending Performance of a Continuous Mixer
- Die Extrusion
- Profile Die Design Based on Flow Balancing
- Capillary Flow of Hard-Metal Carbide Powder Compounds
- Fiber/Film
- Numerical Simulation of the Film Casting Process
- Molding
- Breakage and Buckling of Fibrous Reinforcements During Fabrication of Thermoplastic Matrix Composites
- Long Glass Fibre Reinforcement of Thermo Plastics
- Fitting of K-BKZ Model Parameters for the Simulation of Thermoforming
- Tensile Damage in Ternary Melamine-Formaldehyde Composites
Artikel in diesem Heft
- Editorial
- In Memory of Carl Klason (1938–1997)
- Mixing/Screw Extrusion
- Structuring of Interface-modified Polymer Blends
- Mixing Homologous High Viscosity Ratio Polymer Blends in Converging Flow
- The Effect of Miscibility on Rheological and Mechanical Properties of PCL/SAN Blends
- Effect of Twin-Screw Extruder Design and Process Conditions on Ultrafine CaCO3 Dispersion into PP
- Characterization of the Behavior and Blending Performance of a Continuous Mixer
- Die Extrusion
- Profile Die Design Based on Flow Balancing
- Capillary Flow of Hard-Metal Carbide Powder Compounds
- Fiber/Film
- Numerical Simulation of the Film Casting Process
- Molding
- Breakage and Buckling of Fibrous Reinforcements During Fabrication of Thermoplastic Matrix Composites
- Long Glass Fibre Reinforcement of Thermo Plastics
- Fitting of K-BKZ Model Parameters for the Simulation of Thermoforming
- Tensile Damage in Ternary Melamine-Formaldehyde Composites
