A Dynamic Model for Multiple Steady States in Reactive Extrusion
-
L. P. B. M. Janssen
Abstract
The existence of multiple stationary values of the fully filled length in reactive extrusion is studied on the basis of a mathematical model describing dynamic extruder behavior. The extruder is modelled as a plug flow type of reactor. Through the introduction of travel time for a fluid element in the extruder, time dependent viscosity models following from rheokinetics can be used. Special attention is paid to ionic and radical polymerization reactions. Hysteresis behavior for stationary values of the fully filled length exists when die resistance and rotational speed are varied. The effects of reaction rate, viscosity levels and degree-of-fill on stable operation at high conversions are studied. The mathematical dynamic model presented here can account for some of the experimentally observed dynamic phenomena in the reactive extrusion of radical polymers.
© 2001, Carl Hanser Verlag, Munich
Articles in the same Issue
- Editorial
- Tenth of a Series: Pioneer of The Polymer Thermoset Industry – Leo-Hendrik Baekeiand
- Screw Extrusion
- Effects of Process Conditions on the Dissolution of Carbon Dioxide in PS in Foaming Extruders
- The Design of Extrusion Screws: An Optimization Approach
- Generalized Flow of Ellis Fluid in the Screw Channel
- Generalized Flow of Ellis Fluid in the Screw Channel
- Experimental Study of Melting in an Intermeshing Counter-Rotating Twin Screw Extruder
- Reactive Extrusion
- A Dynamic Model for Multiple Steady States in Reactive Extrusion
- Fiber and Film
- PA612 Double Bubble Tubular Film Process – Processability and Structure Development
- Injection Molding
- Injection Molding Technology for High Speed Optical Disk
- Three-dimensional Filling and Post-filling Simulation of Polymer Injection Molding
- Cold Rolling
- Microstructure and Prediction of Stress-strain Behaviour of Cold-rolled PP Sheets
Articles in the same Issue
- Editorial
- Tenth of a Series: Pioneer of The Polymer Thermoset Industry – Leo-Hendrik Baekeiand
- Screw Extrusion
- Effects of Process Conditions on the Dissolution of Carbon Dioxide in PS in Foaming Extruders
- The Design of Extrusion Screws: An Optimization Approach
- Generalized Flow of Ellis Fluid in the Screw Channel
- Generalized Flow of Ellis Fluid in the Screw Channel
- Experimental Study of Melting in an Intermeshing Counter-Rotating Twin Screw Extruder
- Reactive Extrusion
- A Dynamic Model for Multiple Steady States in Reactive Extrusion
- Fiber and Film
- PA612 Double Bubble Tubular Film Process – Processability and Structure Development
- Injection Molding
- Injection Molding Technology for High Speed Optical Disk
- Three-dimensional Filling and Post-filling Simulation of Polymer Injection Molding
- Cold Rolling
- Microstructure and Prediction of Stress-strain Behaviour of Cold-rolled PP Sheets
