TY - JOUR
T1 - On-line visualization of PS/PP melting mechanisms in a co-rotating twin screw extruder
AU - Chen, H.
AU - Sundararaj, U.
AU - Nandakumar, K.
AU - Wetzel, M. D.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2004/12
Y1 - 2004/12
N2 - The melting and deformation mechanisms of polystyrene (PS) and polypropylene (PP) blends were investigated through on-line visualization of the co-rotating twin-screw extrusion process. Two compositions, PFVPS (80:20) and PS/PP (80:20) were chosen as the model systems for this study. A sliding barrel technique was used to realize the on-line visualization using a glass window in the barrel. The axial temperature and pressure profiles along the screw channel were measured using the same sliding technique. It was found that in the PP/PS (80:20) blend, in which PP was the major phase, there was a combined melting of PS and PP, whereas in the PS/PP (80:20) blend, in which PS was the major phase, there was initial melting of PS alone and then combined melting of PS and PP. In the partially filled region, heat conduction from the hot barrel was the major source for heating polymer pellets under the conditions studied here; while in the fully filled region, viscous energy dissipation (VED) generated most of the heat for melting of polymer pellets. The pressure profiles along the extrusion channel gave us insight into the melting process for the two blends. It was found that if there was some molten polymer in the fully filled region, the overall melting process was accelerated due to heating from viscous dissipation.
AB - The melting and deformation mechanisms of polystyrene (PS) and polypropylene (PP) blends were investigated through on-line visualization of the co-rotating twin-screw extrusion process. Two compositions, PFVPS (80:20) and PS/PP (80:20) were chosen as the model systems for this study. A sliding barrel technique was used to realize the on-line visualization using a glass window in the barrel. The axial temperature and pressure profiles along the screw channel were measured using the same sliding technique. It was found that in the PP/PS (80:20) blend, in which PP was the major phase, there was a combined melting of PS and PP, whereas in the PS/PP (80:20) blend, in which PS was the major phase, there was initial melting of PS alone and then combined melting of PS and PP. In the partially filled region, heat conduction from the hot barrel was the major source for heating polymer pellets under the conditions studied here; while in the fully filled region, viscous energy dissipation (VED) generated most of the heat for melting of polymer pellets. The pressure profiles along the extrusion channel gave us insight into the melting process for the two blends. It was found that if there was some molten polymer in the fully filled region, the overall melting process was accelerated due to heating from viscous dissipation.
UR - http://www.scopus.com/inward/record.url?scp=4944251798&partnerID=8YFLogxK
U2 - 10.3139/217.1839
DO - 10.3139/217.1839
M3 - 文章
AN - SCOPUS:4944251798
VL - 19
SP - 342
EP - 349
JO - International Polymer Processing
JF - International Polymer Processing
SN - 0930-777X
IS - 4
ER -