Gas phase polymerization of propylene. Reaction kinetics and molecular weight distribution

G.B. Meier, G. Weickert, Willibrordus Petrus Maria van Swaaij

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Abstract

Gas-phase polymerizations have been executed at different temperatures, pressures, and hydrogen concentrations using Me2Si[Ind]2ZrCl2 / methylaluminoxane / SiO2(Pennsylvania Quarts) as a catalyst. The reaction rate curves have been described by a kinetic model, which takes into account the initially increasing polymerization rate. The monomer concentration in the polymer has been calculated with the Flory-Huggins equation. The kinetic parameters have been determined by fitting the reaction rate curves with the model. At high temperatures, pressures, and hydrogen concentrations a runaway on particle scale may occur leading to reduced polymer yields. The molecular weight and molecular weight distribution of the polymer samples could be described by a two-site model. At constant temperature the chain-transfer probability of sites 1 and 2 depends only on the hydrogen concentration divided by the monomer concentration.
Original languageUndefined
Pages (from-to)500-513
Number of pages14
JournalJournal of polymer science. Part A: Polymer chemistry
Volume39
Issue number4
DOIs
Publication statusPublished - 2001

Keywords

  • Molecular weight
  • Metallocene catalyst
  • Propylene polymerization
  • IR-71642
  • gas phase
  • METIS-203383
  • polymerization kinetics

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