Modelling of the Peroxide Degradation of Polypropylene
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C. Tzoganakis
Abstract
A fully-predictive mathematical model has been developed for the peroxide promoted degradation of polypropylene in a plasticating single-screw extruder. The model is based on a free radical kinetic mechanism for the degradation reaction and on conventional plasticating extrusion theory. Solids conveying, melting, melt pumping and reaction phenomena have been combined and the interactions between flow pattern, mass and heat transfer fields via residence time distribution and the chemorheology of the reactive melt have been considered. Given the geometrical configuration of the screw, the operating conditions and the physical properties of the starting polymer, the model can predict: flow rate, pressure, temperature and molecular weight profiles in the extruder channel and in the die, and the residence time distribution in the system. Finally, model predictions are compared with experimental data from runs on a 38mm, 24:1 L/D single-screw extruder using various peroxide concentrations and rotational screw speeds.
© 1988, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Original Contributions
- Temperature and Velocity Profiles in Drag Flow of a Temperature Dependent Power Law Fluid
- Modelling Flow in Pin-Barrel Screw Extruders
- Modelling of the Peroxide Degradation of Polypropylene
- Polymer Melt Temperature in Single Screw Extrusion
- Flow of a Generalised Power-Law Fluid in Triangular Dies for Rubber Extrusion
- Flow Visualization and Performance of a Non-Intermeshing Counter-Rotating Twin Screw Extruder
Artikel in diesem Heft
- Contents
- Contents
- Original Contributions
- Temperature and Velocity Profiles in Drag Flow of a Temperature Dependent Power Law Fluid
- Modelling Flow in Pin-Barrel Screw Extruders
- Modelling of the Peroxide Degradation of Polypropylene
- Polymer Melt Temperature in Single Screw Extrusion
- Flow of a Generalised Power-Law Fluid in Triangular Dies for Rubber Extrusion
- Flow Visualization and Performance of a Non-Intermeshing Counter-Rotating Twin Screw Extruder
