Single-Site and Dual-Site Metallocene Ethene/Propene Copolymerizations: Experimental and Theoretical Investigations

This is the authors' abstract. We don't add key points for this paper.

Three series of ethylene−propylene copolymers are made using the catalysts ( 1 ) rac -[Me 2 Si(2-Me-4-(1-Naph)Ind) 2 ]ZrCl 2 /MAO, ( 2 ) [Me 2 Si(Ind)(Flu)]ZrCl 2 /MAO, and ( 3 ) a 1:5 mixture of 1 and 2, all with a broad range of (co)monomer mole fractions in the reactor and copolymers. All three series are analyzed by 13 C NMR, DSC, and SEC. The 13 C NMR spectra of the single-site series are the input of the direct peak method to determine the second-order Markov reactivity ratios of the catalysts used. The activities and reactivity ratios of the catalysts in the single-site experiments are used to model the dual-site series based on 13 C NMR data. The results of this modeling are used to interpretate the DSC and SEC data of the dual-site series: most of the melting peak temperatures and molar masses of the dual- site can be attributed to one of the two catalysts.