Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
-
Y. Yu
Abstract
We make a comparative study of structure development in injection molding of isotactic polypropylene, polypropylene blends/compounds and dynamically vulcanized polypropylene thermoplastic elastomers (TPVs) WAXS 2θ scans were used to determine crystalline forms and the distribution of relative amounts of crystalline forms through the cross-section of injection molded parts. WAXS film patterns, polarized optical light micrographs and birefringence were used to qualitatively indicate polymer chain orientation variation through the cross-section. We also used WAXS pole figures to investigate polymer crystalline orientation and filler orientation in different layers of the injection molded parts.
It was found that a low or modest orientation layer exists on the part surface. There is an intermediate highly oriented layer in the parts of isotactic polypropylene and most polypropylene blends/compounds. The interior of the parts was spherulitic and increasingly isotropic as one moved to the center. The thickness of the surface layer increases as the injection pressure decreases. The layer was not observed in parts of dynamically vulcanized polypropylene thermoplastic elastomers. This would seem to be associated with the TPVs possessing a yield stress and not exhibiting substantial fountain flow in mold filling.
© 2003, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourth of a Series: Pioneering Polymer Industry Developments: The First Continuous Kneading Machines
- Screw Extrusion
- Prediction of Residence Time Distribution in EZ and KE Element of a Ko-Kneader by using CFD Method
- Computational Study of Velocity Field in the KE Element of a Modular Ko-Kneader with CFD Method
- Optimization of Sweet Bread Dough Processing Conditions by Twin Screw Extrusion
- Experimental Development of Processing Technology for Yuba-like Films Using Twin Screw Extrusion
- Die Extrusion
- Flow Analyses in a Spiral Mandrel Die Assuming Wall Slip
- Effect of Elongational Viscosity on the Flow in a Flat Die
- Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
- Film
- Scale-up Rule for Double Bubble Tubular Process of PA6 Film
- Molding
- Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes
- Investigation of the Mechanical Properties and Chemical Resistance of PC/PBT/Impact Modifier Blends
- Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- PPS News
- PPS News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourth of a Series: Pioneering Polymer Industry Developments: The First Continuous Kneading Machines
- Screw Extrusion
- Prediction of Residence Time Distribution in EZ and KE Element of a Ko-Kneader by using CFD Method
- Computational Study of Velocity Field in the KE Element of a Modular Ko-Kneader with CFD Method
- Optimization of Sweet Bread Dough Processing Conditions by Twin Screw Extrusion
- Experimental Development of Processing Technology for Yuba-like Films Using Twin Screw Extrusion
- Die Extrusion
- Flow Analyses in a Spiral Mandrel Die Assuming Wall Slip
- Effect of Elongational Viscosity on the Flow in a Flat Die
- Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
- Film
- Scale-up Rule for Double Bubble Tubular Process of PA6 Film
- Molding
- Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes
- Investigation of the Mechanical Properties and Chemical Resistance of PC/PBT/Impact Modifier Blends
- Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- PPS News
- PPS News
