Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol

Justino, Jorge; Dias, A.R.; Tait, J.P.

http://hdl.handle.net/10400.15/4530

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Authors

Justino, Jorge

Dias, A.R.

Tait, J.P.

Abstract(s)

The subject of this work is ethylene polymerisation using Kaminsky type catalysts: Cp2MR2=methylaluminoxane [M=Zr,W,Nb; R=Cl,CH3]. Active center determination and kinetic studies of the (Cp2WCl2 + methylaluminoxane) and Cp2ZrCl2 + methylaluminoxane) systems are described, using a quenching method with tritiated methanol. The activity of the polymer was determined by liquid scintillation counting. We have found 0.5% and 87% of active centers, respectively for W and Zr system. The catalytic activity of complexes Cp2WCl2 and Cp2NbCl2 was compared with that of Cp2ZrCl2. The W and Nb complexes are found to be less active than the Zr complex.

Keywords

Ziegler-catalysts polymerization aluminoxane

URI

http://hdl.handle.net/10400.15/4530

Citation

Justino, J.A.; Dias, A.R. & Tait, J.P. (1995) Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol. Journal of Radioanalytical and Nuclear Chemistry, Articles, 195(2), 355–362. https://doi.org/10.1007/BF02035976