Abstract
Tandem catalytic systems, consisting of one catalyst with two different activators, were successfully employed in preparing branched polyethylene from ethylene as sole monomer. The catalyst precursor ( β -diketonate zirconium) was used in combination with diethylaluminium chloride (AlEt 2 Cl) and methylaluminoxane (MAO) (or trialkylaluminum AlR 3 ) as cocatalysts to form the oligomerization active species and copolymerization active species, respectively. The 13 C NMR spectrum revealed that the resultant polymer was branched polyethylene. The molar ratio between the two cocatalysts had a remarkable effect on the catalytic activity and the properties of copolymer, such as melting temperature, crystallinity, molecular weight and molecular weight distribution.
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