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Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene

Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene

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SCHNEIDER, Martin Julius, Jürgen SUHM, Rolf MÜLHAUPT, Marc-Heinrich PROSENC, Hans-Herbert BRINTZINGER, 1997. Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene. In: Macromolecules. 30(11), pp. 3164-3168. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma961844z

@article{Schneider1997Influ-23755, title={Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene}, year={1997}, doi={10.1021/ma961844z}, number={11}, volume={30}, issn={0024-9297}, journal={Macromolecules}, pages={3164--3168}, author={Schneider, Martin Julius and Suhm, Jürgen and Mülhaupt, Rolf and Prosenc, Marc-Heinrich and Brintzinger, Hans-Herbert} }

Schneider, Martin Julius Macromolecules ; 30 (1997), 11. - S. 3164-3168 Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene Mülhaupt, Rolf eng 2013-06-24T16:56:06Z Prosenc, Marc-Heinrich 1997 Suhm, Jürgen deposit-license Brintzinger, Hans-Herbert Mülhaupt, Rolf 2013-06-24T16:56:06Z The influence of silylene-bridged bis(indenyl) ligand substitution, especially benzannelation and 2-methyl substitution, on methylaluminoxane-activated metallocene-catalyzed ethene/1-octene copolymerization in toluene at 40 °C was investigated. 2-Methyl substitution gave significantly higher molecular masses at the expense of catalyst activity, whereas benzannelation promoted 1-octene incorporation and randomness of the resulting poly(ethene-co-1-octene) copolymers. Force field calculations based on steric arguments were used to explain experimental copolymerization results. Activation energy differences between ethene and 1-octene insertion accounted for improved 1-octene incorporation in the case of benzannelated metallocenes. According to <sup>13</sup>C-NMR microstructure analysis, copolymerization followed first-order Markov statistics. Schneider, Martin Julius Suhm, Jürgen Prosenc, Marc-Heinrich Brintzinger, Hans-Herbert

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