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Contributions to the Experimental Investigation of the Nascent Polymerisation of Ethylene on Supported Catalysts, 1

A Quenched-Flow Apparatus for the Study of Particle Morphology and Nascent Polymer Properties

Authors

  • Audrey Di Martino,

    1. LCPP – CNRS/ESCPE Lyon, Bat. 308F – B.P. 2077, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne Cedex, France
    2. IPP, Department of Chemical Engineering, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
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  • Guenter Weickert,

    1. IPP, Department of Chemical Engineering, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
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  • Timothy F. L. McKenna

    Corresponding author
    1. LCPP – CNRS/ESCPE Lyon, Bat. 308F – B.P. 2077, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne Cedex, France
    • LCPP – CNRS/ESCPE Lyon, Bat. 308F – B.P. 2077, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne Cedex, France. Fax: +33 (0)4 72 43 17 68
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Abstract

A detailed investigation of the kinetics, morphology and polymer properties observed during the polymerisation of ethylene on a Ziegler-Natta catalyst at very short times (t ≥ 40 ms) in a novel, quenched-flow reactor is presented. It was found that for times shorter than a tenth of a second, the observed rate of polymerisation was significantly higher than expected, and that the crystallinity of the nascent ethylene homopolymer was of the order of 25 to 30% – much lower than expected. Evidence is presented that shows that fragmentation is essentially complete in a small fraction of a second.

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