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

doi:10.1515/znb-2002-1011

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

University of Ulm

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

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 MAO at ambient temperature. The resulting high molecular weight polymer products (M_w > 4.0 × 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.

Original language	English
Pages (from-to)	1141-1146
Number of pages	6
Journal	Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume	57
Issue number	10
DOIs	https://doi.org/10.1515/znb-2002-1011
State	Published - 1 Oct 2002
Externally published	Yes

Keywords

Branched Polyethenes
C/C-Copolymers
Non-Symmetric Diimine Ni(II) Catalysts

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10.1515/znb-2002-1011

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title = "Novel non-symmetric nickel-diimine complexes for the homopolymerization of ethene: Control of branching by catalyst design",

abstract = "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 MAO at ambient temperature. The resulting high molecular weight polymer products (Mw > 4.0 × 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 = "Branched Polyethenes, C/C-Copolymers, Non-Symmetric Diimine Ni(II) Catalysts",

author = "Markus Schmid and Robert Eberhardt and J{\"u}rgen Kukral and Bernhard Rieger",

year = "2002",

month = oct,

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doi = "10.1515/znb-2002-1011",

language = "English",

volume = "57",

pages = "1141--1146",

journal = "Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences",

issn = "0932-0776",

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}

Novel non-symmetric nickel-diimine complexes for the homopolymerization of ethene: Control of branching by catalyst design. / Schmid, Markus; Eberhardt, Robert; Kukral, Jürgen et al.
In: Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, Vol. 57, No. 10, 01.10.2002, p. 1141-1146.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Novel non-symmetric nickel-diimine complexes for the homopolymerization of ethene

T2 - Control of branching by catalyst design

AU - Schmid, Markus

AU - Eberhardt, Robert

AU - Kukral, Jürgen

AU - Rieger, Bernhard

PY - 2002/10/1

Y1 - 2002/10/1

N2 - 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 MAO at ambient temperature. The resulting high molecular weight polymer products (Mw > 4.0 × 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.

AB - 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 MAO at ambient temperature. The resulting high molecular weight polymer products (Mw > 4.0 × 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.

KW - Branched Polyethenes

KW - C/C-Copolymers

KW - Non-Symmetric Diimine Ni(II) Catalysts

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DO - 10.1515/znb-2002-1011

M3 - Article

AN - SCOPUS:0036808787

SN - 0932-0776

VL - 57

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JO - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences

JF - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences

IS - 10

ER -

Novel non-symmetric nickel-diimine complexes for the homopolymerization of ethene: Control of branching by catalyst design

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