C. D. Souza, R. F. Souza, Katia Bernardo-Gusmão
May 30, 2007
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0
Influential Citations
38
Citations
Journal
Applied Catalysis A-general
Abstract
Abstract Ethylene polymerization was carried out with two nickel(II)(α-diimine) complexes: 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine-dichloro-nickel(II) ( 1 ) and 1,4-bis(2,6-diisopropylphenyl)-ethanediimine-dichloronickel(II) ( 2 ) combined with alkylaluminum activators like methylalumoxane (MAO), trimethylaluminum (TMA), and ethylaluminum sesquichloride (EASC). The activity of these systems and the proprieties of the polymeric materials are strongly influenced by the choice of the ligand structure and, more dramatically, by the nature of the cocatalyst. EASC has been shown as giving higher productivities than TMA or MAO with both complexes, attaining 3966 kg PE/(mol Ni·h). Complex 2 gives lower productivities but produced polymers with higher polymer melting points ( T m ) and crystallinity than catalyst 1 .