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Numerical analysis of a reactive extrusion process. Part II: Simulations and verifications for the twin screw extrusion
Author(s) -
Fukuoka Takamasa
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11383
Subject(s) - reactive extrusion , materials science , plastics extrusion , extrusion , isothermal process , rheology , extrusion moulding , viscosity , shear (geology) , high density polyethylene , flow (mathematics) , residence time (fluid dynamics) , polypropylene , composite material , polyethylene , polymer chemistry , mechanics , thermodynamics , physics , geotechnical engineering , engineering
Abstract A newly designed extruder reactor for grafting vinyl monomers onto polyolefins was studied experimentally and theoretically. The process was made up of a self‐wiping co‐rotating twin screw extruder with a separated reaction zone and two vent zones. The reactive extrusion was performed using a linear low density polyethylene, vinyltrimethoxysilane and di‐t‐butylperoxide under different operation conditions. For the purpose of process analysis, we built a computer simulation based on the reaction kinetics and rheological models studied in the preceding paper. The flow field in the extruder was calculated by the flow analysis network (FAN) method with non‐isothermal non‐Newtonian flow conditions. The iterative procedure was organized to predict local pressure, filling factor, cumulative residence time and temperature along the extruder. Furthermore, we succeeded in representing the profiles of reaction conversion and shear viscosity. Calculated results showed good agreements with the experimental data.