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e-Polymers

Editor-in-Chief: Agarwal, Seema / Greiner, Andreas

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1618-7229
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Volume 1, Issue 1

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Volume 1 (2001)

Molecular weight control and end group functionalization of polynorbornene by Ni(II)-initiated polymerization of norbornene in the presence of ethylene and ɑ-olefins

Christian Mast
  • Philipps-Universität Marburg, FB Chemie, Hans-Meerwein-Str., D-35032 Marburg, Germany; Fax 06421-2825785
  • Other articles by this author:
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/ Matthias Krieger
  • Philipps-Universität Marburg, FB Chemie, Hans-Meerwein-Str., D-35032 Marburg, Germany; Fax 06421-2825785
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/ Kurt Dehnicke
  • Philipps-Universität Marburg, FB Chemie, Hans-Meerwein-Str., D-35032 Marburg, Germany; Fax 06421-2825785
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/ Andreas Greiner
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  • Philipps-Universität Marburg, FB Chemie, Hans-Meerwein-Str., D-35032 Marburg, Germany; Fax 06421-2825785
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Published Online: 2013-08-31 | DOI: https://doi.org/10.1515/epoly.2001.1.1.150

Abstract

High-molecular-weight vinyl-type polynorbornene (PN) was obtained in high yields by a highly active nickel-based phosphorane iminato complex in the presence of methylaluminoxane. Termination of norbornene polymerization by functionalized ɑ-olefins yielded soluble end group functionalized polynorbornenes of controlled molecular weight. The impact of the ɑ-olefins on yield and Mn depends significantly on the sterical situation at the olefins. No proof for the incorporation of the olefin at any other position than the chain end was observed. Considerations based on yields and Mn suggest that the Ni hydride species, which is most likely formed upon β-H elimination reaction in the scheme of olefin addition to the growing PN chain, initiates a new PN chain; in other words, chain transfer occurs through β-H elimination reaction.

About the article

Published Online: 2013-08-31

Published in Print: 2001-12-01


Citation Information: e-Polymers, Volume 1, Issue 1, 016, ISSN (Online) 1618-7229, ISSN (Print) 2197-4586, DOI: https://doi.org/10.1515/epoly.2001.1.1.150.

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