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SIO2-Supported Metallocene Catalysts for Propene Polymerization: Electron Microscopic Studies and Tomographical Reconstructions of Polymer Growth

Published online by Cambridge University Press:  02 July 2020

B. Steinmetz ,
B. Weimann ,
G. Fink  and
B. Tesche
B. Steinmetz
Affiliation:
Max-Planck-Institut fur Kohlenforschung, Kaiser-Wilhelm-Platz1, D-45470, Miilheim an der Ruhr, Germany
B. Weimann
Affiliation:
Max-Planck-Institut fur Kohlenforschung, Kaiser-Wilhelm-Platz1, D-45470, Miilheim an der Ruhr, Germany
G. Fink
Affiliation:
Max-Planck-Institut fur Kohlenforschung, Kaiser-Wilhelm-Platz1, D-45470, Miilheim an der Ruhr, Germany
B. Tesche
Affiliation:
Max-Planck-Institut fur Kohlenforschung, Kaiser-Wilhelm-Platz1, D-45470, Miilheim an der Ruhr, Germany
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Summary:

The polypropylene growth process on silica supported metallocene catalysts was examined by electron microscopy and kinetic investigations. It was possible to identify different polymerization stages with different characteristic kinetic data in the slurry phase which led to the development of a refined polymer growth model [1-2]. Tomographical reconstruction of shortly polymerized catalyst particles obtained by electron micrographs of serial microtome sections turned out to be a useful tool to achieve a better understanding of the heterogeneous polymerization process and the influence of the support structure on polymer growth.

1. Introduction

Single-site metallocene catalysts produce extremely uniform polymers with molecular weight distributions (MWD) of 2 or less and very narrow compositional distributions in comparison to conventional Ziegler-catalysts. For industrial gas phase or bulk polymerization in existing plants (drop-in-technology) it is necessary to fix the catalytically active components on a heterogeneous support.

Type
Advances in Polymer Characterization
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 1126 - 1127
Copyright
Copyright © Microscopy Society of America

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References

References:

[1]Zechlin, J., Steinmetz, B., Tesche, B., Fink, G., Macromol. Chem. Phys. 201 (2000), in press.Google Scholar
[2]Fink, G., Steinmetz, B., Zechlin, J., Przybyla, C., Tesche, B., Chem. Ref (2000), impress.Google Scholar
[3]for review: Metalorganic Catalysts for Synthesis and Polymerization, 1999, Kaminsky, (Eds.), Springer Verlag Berlin.CrossRefGoogle Scholar
[4]Bonini, F., Fraaije, V., Fink, G., J. Polym. Sci. Part A: Polym. Chem. 33 (1995) 2393.CrossRefGoogle Scholar