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  Ethene/norbornene copolymerization using the catalyst system Pri[(3-Pri-Cp)Flu]ZrCl2: Determination of the copolymerization parameters and mechanistic considerations

Wendt, R. A., Mynott, R., & Fink, G. (2002). Ethene/norbornene copolymerization using the catalyst system Pri[(3-Pri-Cp)Flu]ZrCl2: Determination of the copolymerization parameters and mechanistic considerations. Macromolecular Chemistry and Physics, 203(18), 2531-2539. doi:10.1002/macp.200290048.

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 Creators:
Wendt, R. A.1, Author           
Mynott, R.2, Author           
Fink, G.1, Author           
Affiliations:
1Research Department Fink, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445583              
2Service Department Mynott (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445627              

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Free keywords: chain migration mechanism; copolymerization; copolymerization parameters; ethene/norbornene copolymers; metallocene catalysts; retention mechanism
 Abstract: The (13) NMR spectra of ethane/norbornene copolymers in which there are no norbornene microblocks are much simpler than those of copolymers in which norbornene microblocks are present, making it possible to completely assign all the C-13 resonances to the corresponding pentads in the copolymer chain. However, there is disagreement in the literature over several assignments of the ethane C-13 NMR signals. In this paper these discrepencies are summarized and discussed. This contribution also reports ethane/norbornene copolymerizations carried out at various temperatures using the homogeneous catalyst system Pr[(3-Pr-Cp)Flu]ZrCl2. The C-13 NMR spectra of the copolymers were analyzed in the light of the discussion above and the triad discussions were used to determine the copolmerization parameters by Markov first- and second-order statistical models. On the basis of these results, the mechanism generating such an alternating microstructure in these copolymers is discussed and compared with the mechanism previously proposed in the literature. The C-13 NMR spectrum with signal assignments of an ethane/norbornene copolymer without norbornene microblocks.

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Language(s): eng - English
 Dates: 2002-12-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 19873
DOI: 10.1002/macp.200290048
ISI: 000181469100001
 Degree: -

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Title: Macromolecular Chemistry and Physics
  Alternative Title : Macromol. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 203 (18) Sequence Number: - Start / End Page: 2531 - 2539 Identifier: ISSN: 1022-1352