Zirconocene Aluminohydride‐Methylaluminoxane Clathrates for Ethylene Polymerization in Slurry

Zirconocene Aluminohydride‐Methylaluminoxane Clathrates for Ethylene Polymerization in Slurry

The main aim of this work is to obtain heterogeneous, zirconocene aluminohydride/methylaluminoxane (MAO) polymerization catalysts, without using inorganic carriers like silica. The syntheses of zirconocenium ion‐based clathrates, formed from aluminohydride zirconocene complexes activated with MAO, a...

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Bibliographic Details
Published in:Macromolecular symposia. Vol. 374; no. 1
Main Authors: Padilla‐Gutiérrez, Benjamín, Ventura‐Hunter, Carolina, García‐Zamora, Maricela, Collins, Scott, Estrada‐Ramírez, Alba N., Pérez‐Camacho, Odilia
Format: Journal Article
Language:English
Published: Weinheim Wiley Subscription Services, Inc 01-08-2017
Subjects:
Addition polymerization
Amine oxidase (flavin-containing)
catalyst
Catalysts
Chemical synthesis
Clathrates
Ethylene
Low concentrations
Polyethylene
Polyethylenes
Polymerization
Potassium chloride
Silica
Silicon dioxide
Silicones
Slurries
slurry polymerization
Toluene
zirconocenes
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Summary:The main aim of this work is to obtain heterogeneous, zirconocene aluminohydride/methylaluminoxane (MAO) polymerization catalysts, without using inorganic carriers like silica. The syntheses of zirconocenium ion‐based clathrates, formed from aluminohydride zirconocene complexes activated with MAO, are reported here. Several different approaches were examined for the synthesis of these clathrate compositions; in one approach the catalyst (nBuCp2ZrH3AlH2/MAO) was first prepared in toluene solution, and the clathrate phase then generated by addition of silicone oil. An alternate approach involved reaction of silicone oil or another clathrate‐forming additive (e.g. KCl) with MAO to form a solidified clathrate, and then introducing the zirconocene aluminohydride complex (nBuCp2ZrH3AlH2). The clathrate catalysts were probed in the polymerization of ethylene in hydrocarbon slurry, without using additional co‐catalyst (MAO), or at very low concentrations of modified MAO (MMAO 7, 13 wt‐% in iso‐octane). The catalytic activities of the solid clathrate catalysts were compared as well as the morphology and properties of the polyethylene synthesized in slurry.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.201600139