TY - JOUR
T1 - Flow enhancement in the continuous extrusion of linear low-density polyethylene
AU - Pérez-González, José
AU - Denn, Morton M.
PY - 2001/10/3
Y1 - 2001/10/3
N2 - Enhanced throughput and the elimination of sharkskin were observed over an extended temperature range when linear low-density polyethylenes having the same molecular weight, polydispersity, and melt index, one with and one without commercial additives, were extruded through α-brass dies. The additives appear to play a significant role in the detailed flow behavior, however, most notably in an irreversible transition to a "normal" flow curve at stresses on the order of 0.3 MPa. There are indications of a slip-like phenomenon, including the occurrence of electrostatic charge on the extrudate. A high-throughput, low-extrusion-pressure processing window like that associated by Keller with a transition to a mesophase was observed for the polymer containing no additives, but not for the polymer containing additives.
AB - Enhanced throughput and the elimination of sharkskin were observed over an extended temperature range when linear low-density polyethylenes having the same molecular weight, polydispersity, and melt index, one with and one without commercial additives, were extruded through α-brass dies. The additives appear to play a significant role in the detailed flow behavior, however, most notably in an irreversible transition to a "normal" flow curve at stresses on the order of 0.3 MPa. There are indications of a slip-like phenomenon, including the occurrence of electrostatic charge on the extrudate. A high-throughput, low-extrusion-pressure processing window like that associated by Keller with a transition to a mesophase was observed for the polymer containing no additives, but not for the polymer containing additives.
UR - http://www.scopus.com/inward/record.url?scp=0035802299&partnerID=8YFLogxK
U2 - 10.1021/ie0007771
DO - 10.1021/ie0007771
M3 - Artículo
SN - 0888-5885
VL - 40
SP - 4309
EP - 4316
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 20
ER -