Publikation: Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene
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1997
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Macromolecules. 1997, 30(11), pp. 3164-3168. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma961844z
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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 13C-NMR microstructure analysis, copolymerization followed first-order Markov statistics.
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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. 1997, 30(11), pp. 3164-3168. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma961844zBibTex
@article{Schneider1997Influ-23755,
year={1997},
doi={10.1021/ma961844z},
title={Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene},
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}
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<dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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