Gas-phase polymerization of propylene: Reaction kinetics and molecular weight distribution

Meier, G.B. and Weickert, G. and Swaaij van, W.P.M. (2001) Gas-phase polymerization of propylene: Reaction kinetics and molecular weight distribution. Journal of Polymer Science, Part A: Polymer chemistry, 39 (4). pp. 500-513. ISSN 0887-624X

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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.
Item Type:	Article
Copyright:	© 2001 Wiley InterScience
Faculty:	Science and Technology (TNW)
Research Group:	Thermo-Chemical Conversion of Biomass (TCCB)
Link to this item:	http://purl.utwente.nl/publications/71642
Official URL:	http://dx.doi.org/10.1002/1099-0518(20010215)39:4<500::AID-POLA1019>3.0.CO;2-S
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