Novel catalytic systems, prepared in situ by the oxidative addition of 8-hydroxyquinoline ligands to bis(1,5-cyclooctadiene)nickel(0) and activated by methylaluminoxane, were studied in ethylene polymerization. When 8-hydroxyquinoline was employed, only oligomeric products were obtained. On the contrary, 5,7-dinitro-8-hydroxyquinoline gave linear polyethylene (PE), but with a modest activity. For the catalyst based on 5-nitro-8-hydroxyquinoline, the productivity was largely dependent on the content of free trimethylaluminum. (TMA) present in the commercial aluminoxane. The progressive optimization of the TMA/oligomeric methylaluminoxane ratio increased the productivity, which reached 700 kg of PE/(mol of Ni x h), by an order of magnitude. (c) 2005 Wiley Periodicals, Inc.

Ethylene polymerization by novel ziegler-natta-type catalysts obtained in situ by the oxidative addition of 8-hydroxyquinoline-based ligands to bis(1,5-cyclooctadiene)nickel(0) and methylaluminoxane

RASPOLLI GALLETTI, ANNA MARIA;
2006-01-01

Abstract

Novel catalytic systems, prepared in situ by the oxidative addition of 8-hydroxyquinoline ligands to bis(1,5-cyclooctadiene)nickel(0) and activated by methylaluminoxane, were studied in ethylene polymerization. When 8-hydroxyquinoline was employed, only oligomeric products were obtained. On the contrary, 5,7-dinitro-8-hydroxyquinoline gave linear polyethylene (PE), but with a modest activity. For the catalyst based on 5-nitro-8-hydroxyquinoline, the productivity was largely dependent on the content of free trimethylaluminum. (TMA) present in the commercial aluminoxane. The progressive optimization of the TMA/oligomeric methylaluminoxane ratio increased the productivity, which reached 700 kg of PE/(mol of Ni x h), by an order of magnitude. (c) 2005 Wiley Periodicals, Inc.
2006
Carlini, C; De Luise, V; RASPOLLI GALLETTI, ANNA MARIA; Sbrana, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/105908
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