Copolymerization behavior of Cp2ZrCl2/MAO and [(CO)5WC(Me)OZrCp2Cl]/MAO: A comparative study on ethylene/1-pentene copolymers

Luruli N. ; Heinz L.-C. ; Grumel V. ; Brull R. ; Pasch H. ; Raubenheimer H.G. (2006)


Ethylene/1-pentene copolymers were synthesized using Cp 2ZrCl2(1)/MAO and [(CO)5WC(Me)OZr(Cp) 2Cl](2)/MAO catalyst systems. The copolymers were characterized by SEC, DSC, FTIR and 13C NMR spectroscopy. The copolymers synthesized with [(CO)5WC(Me)OZr(Cp)2Cl](2)/MAO had higher average molecular weights and broader polydispersities compared to those produced with Cp2ZrCl2(1)/MAO. The chemical heterogeneity was investigated by SEC-FTIR and fractionation techniques. All copolymers showed a higher incorporation of the 1-pentene in the low molecular weight fraction as revealed by SEC-FTIR. Crystallization analysis fractionation (CRYSTAF) showed a broad chemical composition distribution (CCD) for all the copolymers synthesized with these two catalyst systems. Selected copolymers were also analyzed using an automated preparative molecular weight fractionation. © 2005 Elsevier Ltd. All rights reserved.

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