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- W2003158296 abstract "Ethene was homo- and copolymerized over the methylaluminoxane (MAO) activated meso- and rac-diastereomers of 1- and 2-tert-butyldimethylsiloxy-substituted ethylenebis(indenyl)zirconium dichlorides (meso-1, rac-1, meso-2, rac-2) at 40 °C in toluene. Homopolyethenes produced at low ethene concentration under slurry conditions revealed significantly modified melt rheological properties resulting from long-chain branching (LCB). In addition, a small amount of ethyl branching was found in polyethenes produced with meso-1, rac-1, and meso-2. The meso-catalysts were found to have an excellent comonomer response; in the copolymerization of ethene with 1-hexene rE(meso-1) = 10 ± 1 and rE(meso-2) = 11 ± 1. Comonomer reactivity ratios indicate a strong preference toward formation of isolated comonomer units in the polymer chain. Chain termination occurs preferentially after regular 1,2-insertion of the comonomer, although irregular 2,1-insertions also inflict some chain terminations with the racemic catalysts but not with the meso-catalysts. In ethene homopolymerization, chain transfer to monomer is the prevailing chain transfer mechanism for all studied catalysts and results in a high vinyl end group selectivity." @default.
- W2003158296 created "2016-06-24" @default.
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- W2003158296 date "2000-11-17" @default.
- W2003158296 modified "2023-10-18" @default.
- W2003158296 title "<i>m</i><i>eso</i>- and <i>rac</i>-Diastereomers of 1- and 2-<i>tert</i>-Butyldimethylsiloxy- Substituted Ethylenebis(indenyl)zirconium Dichlorides for Formation of Short- and Long-Chain Branched Polyethene" @default.
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- W2003158296 doi "https://doi.org/10.1021/ma000872l" @default.
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