Crystal Orientation in Injection Moldings of Flaky Filler-Filled Polypropylenes
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M. Fujiyama
Abstract
Crystal orientation states in injection moldings of polypropylenes filled with flaky fillers such as glass flake, mica, and talc have been studied. Talc-filled polypropylene injection moldings show a peculiar crystal orientation, in which the plate planes of talc particles are aligned parallel to the mold surface, the c- and a'-axes of polypropylene crystals are bimodally oriented to the flow direction, and the b-axes are oriented in the thickness direction. Although an unfilled polypropylene injection molding basically shows a similar crystal orientation to that of the talc-filled polypropylene injection molding, the b-axis orientation to the thickness direction is much weaker. Glass flake- or mica-filled polypropylene injection moldings show similar crystal orientations to that of the unfilled polypropylene injection molding. Only talc-filled polypropylene injection moldings show the peculiar crystal orientation. Since an injection molding of polypropylene filled with only 0.5 wt.-% talc already shows the peculiar crystal orientation, it is assumed that talc influences a remote interaction on the crystallization of polypropylene.
© 1992, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Internal and Continuous Mixers
- Model Development for an Internal Mixer
- Simulation of Flow in a Farrel Continuous Mixer
- Extrusion
- Influence of Process Data on the Throughput of Large Extruders within the Range of 600 to 6 000 kg/h
- Conveying and Melting in Screw Extruders with Axial Screw Movement
- Thermo-viscous Effects in Extrusion of Planar Jets with Solidification
- Film
- Dynamics and Stability of Double Bubble Tubular Film Extrusion
- Melt Strength Behavior of Polyethylene Blends**
- Optical Properties and Orientation Development in Uniaxially Stretched Syndiotactic Polystyrene from Amorphous Precursors
- Molding
- Thermoviscoelastic Calculation of Residual Stresses and Residual Shapes of Injection Molded Parts**
- Analysis and Simulation of Structural Reaction Injection Molding (SRIM)
- Crystal Orientation in Injection Moldings of Flaky Filler-Filled Polypropylenes
- Erratum
- Molecular Orientation in Injection-molded Polypropylene Copolymers with Ethylene
Articles in the same Issue
- Contents
- Contents
- Internal and Continuous Mixers
- Model Development for an Internal Mixer
- Simulation of Flow in a Farrel Continuous Mixer
- Extrusion
- Influence of Process Data on the Throughput of Large Extruders within the Range of 600 to 6 000 kg/h
- Conveying and Melting in Screw Extruders with Axial Screw Movement
- Thermo-viscous Effects in Extrusion of Planar Jets with Solidification
- Film
- Dynamics and Stability of Double Bubble Tubular Film Extrusion
- Melt Strength Behavior of Polyethylene Blends**
- Optical Properties and Orientation Development in Uniaxially Stretched Syndiotactic Polystyrene from Amorphous Precursors
- Molding
- Thermoviscoelastic Calculation of Residual Stresses and Residual Shapes of Injection Molded Parts**
- Analysis and Simulation of Structural Reaction Injection Molding (SRIM)
- Crystal Orientation in Injection Moldings of Flaky Filler-Filled Polypropylenes
- Erratum
- Molecular Orientation in Injection-molded Polypropylene Copolymers with Ethylene
