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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

IMPACT FACTOR 2018: 0.961

CiteScore 2018: 0.91

SCImago Journal Rank (SJR) 2018: 0.263
Source Normalized Impact per Paper (SNIP) 2018: 0.505

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Volume 57, Issue 10


Novel Non-Symmetric Nickel-Diimine Complexes for the Homopolymerization of Ethene: Control of Branching by Catalyst Design

Markus Schmid / Robert Eberhardt / Jürgen Kukral / Bernhard Rieger
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-2002-1011

Non-symmetric diimine ligands (Ar-N=C(CH3)-(CH3)C=NAr*; Ar: 2,6-diisopropyl-phenyl; Ar*: 2,6-di(4-tert-butyl-phenyl)phenyl (4b), 2,6-di(4-OCH3)-phenyl)phenyl (4c)) were synthesized and converted in-situ into the corresponding nickel dibromo complexes (5b, c) by reaction with (DME)NiBr2. The complexes were activated for ethene polymerization by treatment with MAOat ambient temperature. The resulting highmolecular weight polymer products (MW > 4.0 x 106 g mol-1) have a branched microstructure (predominantly methyl groups), as indicated by 13C NMR spectroscopy. The degree of branching can be controlled by a proper choice of the 2,6-diphenyl modified aniline moieties resulting in melting transitions ranging from 92 - 130 °C.

Keywords : Non-Symmetric Diimine Ni(II) Catalysts; Branched Polyethenes; C2/C3-Copolymers

About the article

Received: 2002-06-28

Published Online: 2014-06-02

Published in Print: 2002-10-01

Citation Information: Zeitschrift für Naturforschung B, Volume 57, Issue 10, Pages 1141–1146, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2002-1011.

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