Justino, JorgeDias, A.R.Ascenso, J.Marques, M.M.Tait, P.J.T.2023-04-042023-04-041997Justino, J.; Dias, A.R.; Ascenso, J.; Marques, M.M. & Tait, P.J.T. (1997). Polymerization of ethylene using metallocene and aluminoxane systems. Polymer International, 44(4): 407-412. https://doi.org/10.1002/(SICI)1097-0126(199712)44:4<407::AID-PI844>3.0.CO;2-1http://hdl.handle.net/10400.15/4378This paper describes ethylene polymerization using a number of metal-locene and aluminoxane catalyst systems, Cp2MR2 and methylaluminoxane [M = Zr, W, Nb; R = Cl, CH3]. Two types of methylaluminoxane, MAO (1) and MAO (2), were used as cocatalysts. The polymerization activities of the complexes Cp2WCl2 and Cp2NbCl2 were compared with that of Cp2ZrCl2. The Nb and W complexes were found to be less active than the Zr complex. Polyethylene characterization was also carried out by the following methods: gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR).engmetallocenealuminoxanesZiegler-Natta catalysisethylene polymerizationactive centresjournal articlehttps://doi.org/10.1002/(SICI)1097-0126(199712)44:4<407::AID-PI844>3.0.CO;2-11097-0126