Mixing in reactive extrusion of low-density polyethylene melts: linear vs. branched

R. Polance, K. Jayaraman

Research output: Contribution to journalArticle

  • 12 Citations

Abstract

The melt flows of linear low-density polyethylene (LLDPE) and branched low-density polyethylene (LDPE) have been compared. A fully intermeshing co-rotating twin-screw extruder was used. The effects of the melt rheology on the mixing were studied. Residence time distributions obtained in the melt zones of the extruder with tracer dye reveal that the LDPE has a narrower residence time distribution than the LLDPE over a wide range of operating conditions. The axial dispersion for the LDPE is significantly lower than the axial dispersion for the LLDPE. This is attributed to the greater extensional viscosity of the LDPE. The crosslinking reaction has been used for observation: solid maleic anhydride and polyethylene were added at the feed port but the peroxide initiator was added only after the polymer was melted. Residence time distributions measured for the chemically more reactive LLDPE melt indicate reduced levels of axial mixing with reaction. The reduction in mixing is smaller than the difference in mixing between LDPE and LLDPE.

LanguageEnglish (US)
Pages1535-1545
Number of pages11
JournalPolymer Engineering and Science
Volume35
Issue number19
StatePublished - Oct 1995

Profile

Linear low density polyethylenes
Low density polyethylenes
Polyethylene
Extrusion
Residence time distribution
Extruders
Maleic Anhydrides
Maleic anhydride
Peroxides
Rheology
Crosslinking
Polyethylenes
Dyes
Viscosity
Polymers
Coloring Agents

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Mixing in reactive extrusion of low-density polyethylene melts : linear vs. branched. / Polance, R.; Jayaraman, K.

In: Polymer Engineering and Science, Vol. 35, No. 19, 10.1995, p. 1535-1545.

Research output: Contribution to journalArticle

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