Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
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M. Fujiyama
Abstract
Aiming at a synergism of improvements of impact strength of polypropylene by the addition of β-crystal nucleator and of its rigidity by the filling of particulate, the addition of the nucleator to particulate-filled polypropylenes has been studied. 0 to 3000 ppm of γ-quinacridone (GQ) which is a β-crystal nucleator was added to homo isotactic polypropylenes (PP) filled with 0 to 30 wt-% of talc (TC) which shows an α-crystal nucleating effect, of mica (MC), or of glass flake (GF), last two of which show β-crystal nucleating effects. Flexural and Izod impact test specimens were injection-molded from the PPs under constant molding conditions and the structure and properties have been investigated. The β-crystal content is reduced by the filling of particulates. The degree of the reduction is in the order of TC >MC >GF, which agrees with that of the crystallization temperature. The flexural modulus decreases slightly with increasing GQ content and increases with increases in particulate contents. The increase is in the order of MC > TC > GF, which agrees with that of the aspect ratio. The enhancing effect of the Izod impact strength by the addition of GQ decreases with increasing particulate contents and diminishes at contents above 10 wt-%. Particulates deteriorate the enhanced impact strength of β-PP. Thus the expected synergism could not be obtained enough.
© 1998, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- Fourth in a Series: Pioneers of Polymer Processing Alexander Parkes
- Screw Extrusion/Mixing
- Flow Analysis in Screw Extruders-Effect of Kinematic Conditions
- Distributive Mixing in an Axial Discharge Continous Mixer
- Fluid Mechanics of Intermeshing Counter-Rotating Twin Screw Extruders
- Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets
- Utilization of Recycled Crumb Rubber as a Compounding Tool
- Fibers and Films
- Manufacture-Induced Inaccuracies of Spinning Dies1
- Modeling of Segmented Polyurethane Drying Process
- Roll Coating
- Numerical Calculation of the Velocity and Temperature Field in the Reverse Roll Coating
- Molding
- Simulation of Reactive Liquid Composite Molding
- Consistency and Flexibility of Multi Cavity Melt Control
- Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
- Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
- Warpage of Injection Moulded Plates and Corner Products
Articles in the same Issue
- Contents
- Contents
- Editorial
- Fourth in a Series: Pioneers of Polymer Processing Alexander Parkes
- Screw Extrusion/Mixing
- Flow Analysis in Screw Extruders-Effect of Kinematic Conditions
- Distributive Mixing in an Axial Discharge Continous Mixer
- Fluid Mechanics of Intermeshing Counter-Rotating Twin Screw Extruders
- Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets
- Utilization of Recycled Crumb Rubber as a Compounding Tool
- Fibers and Films
- Manufacture-Induced Inaccuracies of Spinning Dies1
- Modeling of Segmented Polyurethane Drying Process
- Roll Coating
- Numerical Calculation of the Velocity and Temperature Field in the Reverse Roll Coating
- Molding
- Simulation of Reactive Liquid Composite Molding
- Consistency and Flexibility of Multi Cavity Melt Control
- Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
- Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
- Warpage of Injection Moulded Plates and Corner Products
