Evolution of Morphology of iPP in Processing Conditions
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I. Coccorullo
Abstract
A model for crystallization kinetics that accounts for the formation of different crystalline phases and is able to describe the morphological characteristics of samples solidified under quiescent conditions, has been enriched to account for the effect of solidification pressure. The effect of pressure was considered by assuming a linear increase of melting and glass transition temperatures (which are involved in the description of the growth rate and nucleation density of the alpha phase). Moreover, pressure was incorporated in the kinetic constant adopted to describe the evolution of the mesomorphic phase. The parameters of the model were identified on the basis of literature data on the distribution of crystalline phases in samples solidified under different pressures. The modified model also satisfactorily described PVT curves up to 100 MPa, and is now able to describe the evolution of morphology during solidification at cooling rates as fast as several hundreds of Kelvin degrees per second and under pressures of as high as 100 MPa.
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© 2005, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue Macro 2004
- Invited Paper
- A Dilatometer to Measure the Influence of Cooling Rate and Melt Shearing on Specific Volume
- Monitoring Reactive Processes along the Extruder
- Stretch and Shape Distributions of Droplets with Interfacial Tension in Chaotic Mixing
- Cast Film Extrusion
- Nozzle Injection of Physical Blowing Agents in the Injection Molding of Microcellular Foams
- Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System
- In-process Monitoring of Micromoulding – Assessment of Process Variation
- Processing-induced Properties in Glassy Polymers
- Structure Development in Injection Molding: A 3D Simulation with a Differential Formulation of the Kinetic Equations
- Evolution of Morphology of iPP in Processing Conditions
- Regular Contributed Articles
- 3D Simulation of Gas Assisted Injection Molding Analysis of Primary and Secondary Gas Penetration and Comparison with Experimental Results
- Microcellular Injection Molding
- Effect of Material Species on Flash Generation of PPS/GF Composites
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue Macro 2004
- Invited Paper
- A Dilatometer to Measure the Influence of Cooling Rate and Melt Shearing on Specific Volume
- Monitoring Reactive Processes along the Extruder
- Stretch and Shape Distributions of Droplets with Interfacial Tension in Chaotic Mixing
- Cast Film Extrusion
- Nozzle Injection of Physical Blowing Agents in the Injection Molding of Microcellular Foams
- Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System
- In-process Monitoring of Micromoulding – Assessment of Process Variation
- Processing-induced Properties in Glassy Polymers
- Structure Development in Injection Molding: A 3D Simulation with a Differential Formulation of the Kinetic Equations
- Evolution of Morphology of iPP in Processing Conditions
- Regular Contributed Articles
- 3D Simulation of Gas Assisted Injection Molding Analysis of Primary and Secondary Gas Penetration and Comparison with Experimental Results
- Microcellular Injection Molding
- Effect of Material Species on Flash Generation of PPS/GF Composites
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
