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

R. Polance, K. Jayaraman

    Research output: Contribution to journalArticle

    • 11 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.

    Original languageEnglish (US)
    Pages (from-to)1535-1545
    Number of pages11
    JournalPolymer Engineering and Science
    Volume35
    Issue number19
    StatePublished - Oct 1995

    Profile

    Low density polyethylenes
    Linear low density polyethylenes
    Cestoda
    Residence time distribution
    Extruders
    Acyl Carrier Protein
    Maleic anhydride
    Peroxides
    Rheology
    Crosslinking
    Extrusion
    Polyethylenes
    Dyes
    Viscosity
    Polymers
    Equilenin
    Dextrothyroxine
    Butylene Glycols
    Artificial Heart
    Progesterone

    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

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

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

    Research output: Contribution to journalArticle

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