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Main Title: Fragmentable Heterogeneous Cocatalysts for the Metallocene-Catalyzed Polymerization of Olefins, II [1]. Preparation, Characterization and Testing of the Cocatalysts and Microscopic Evaluation of the Polyethylene
Author(s): Schumann, Herbert
Widmaier, Ralf
Lange, Katharina C. H.
Wassermann, Birgit C.
Type: Article
Language Code: en
Abstract: Surface modified silica were reacted with different aluminiumalkyls AlR2R’ (R = Me, Et, i-Bu, R’ = H, Me, Et, i-Bu), oligomeric methylaluminoxane (MAO) and combinations of both, to yield heterogeneous cocatalysts. These cocatalyts were employed to polymerize ethylene using zirconocene dichloride as the catalyst. The polymerization activity profiles have been recorded and compared with the information gained from the scanning electron microscopy (SEM) images of the polymers. The fragmentation of the heterogeneous cocatalyts upon polymerization has been demonstrated. The degree of fragmentation and the polymerization activity depend on the preparation of the silica supports and on the preparation of the heterogeneous cocatalysts using these supports. The most reactive, fragmentable heterogeneous cocatalysts show polymerization activities slightly higher than MAO in homogeneous solution and almost 1.5 times higher than commercially available MAO on silica (=MAO on Sylopol).
Issue Date: 2005
Date Available: 15-Oct-2018
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): cocatalyst
Sponsor/Funder: BMBF, 03C0295, Verbundprojekt: Heterogene und homogene Cokatalysatoren und Katalysatoren für die Olefinpolymerisation
DFG, GRK 352, Synthetische, mechanistische und reaktionstechnische Aspekte von Metallkatalysatoren
Journal Title: Zeitschrift für Naturforschung B
Publisher: De Gruyter
Publisher Place: Berlin
Volume: 60
Issue: 6
Publisher DOI: 10.1515/znb-2005-0604
Page Start: 614
Page End: 626
EISSN: 1865-7117
ISSN: 0932-0776
Appears in Collections:Inst. Chemie » Publications

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