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Synthesis of Aqueous Polyethylene Dispersions with Electron-Deficient Neutral Nickel(II) Catalysts with Enolatoimine Ligands

Synthesis of Aqueous Polyethylene Dispersions with Electron-Deficient Neutral Nickel(II) Catalysts with Enolatoimine Ligands

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YU, Sze-Man, Andreas BERKEFELD, Inigo GÖTTKER-SCHNETMANN, Gerhard MÜLLER, Stefan MECKING, 2007. Synthesis of Aqueous Polyethylene Dispersions with Electron-Deficient Neutral Nickel(II) Catalysts with Enolatoimine Ligands. In: Macromolecules. 40(3), pp. 421-428. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma061804n

@article{Yu2007-02Synth-42126, title={Synthesis of Aqueous Polyethylene Dispersions with Electron-Deficient Neutral Nickel(II) Catalysts with Enolatoimine Ligands}, year={2007}, doi={10.1021/ma061804n}, number={3}, volume={40}, issn={0024-9297}, journal={Macromolecules}, pages={421--428}, author={Yu, Sze-Man and Berkefeld, Andreas and Göttker-Schnetmann, Inigo and Müller, Gerhard and Mecking, Stefan} }

Berkefeld, Andreas Yu, Sze-Man Mecking, Stefan 2018-04-20T12:57:01Z Yu, Sze-Man 2007-02 Mecking, Stefan Göttker-Schnetmann, Inigo Göttker-Schnetmann, Inigo Synthesis of Aqueous Polyethylene Dispersions with Electron-Deficient Neutral Nickel(II) Catalysts with Enolatoimine Ligands Berkefeld, Andreas Müller, Gerhard Müller, Gerhard eng A series of new, electron-poor neutral κ<sup>2</sup>-N,O chelated Ni(II) complexes were studied for ethylene polymerization in aqueous emulsion. Complexes based on enolatoimine ligands bearing electron-withdrawing trifluoromethyl and trifluoroacetyl groups [κ<sup>2</sup>-N,O-{2,6-R<sub>2</sub>C<sub>6</sub>H<sub>3</sub>NC(H)C(COCF<sub>3</sub>)C(O)CF<sub>3</sub>}]Ni(L)Me (4a, R =<sup> i</sup>Pr, L = pyridine; 4b, R = 3,5-(CF<sub>3</sub>)<sub>2</sub>C<sub>6</sub>H<sub>3</sub>, L = pyridine; 5b, R = 3,5-(CF<sub>3</sub>)<sub>2</sub>C<sub>6</sub>H<sub>3</sub>, L = PPh<sub>3</sub>) were prepared. The complexes are very active in aqueous emulsions, with 1.4 × 10<sup>4</sup> TO h<sup>-1</sup> for 4a (50 °C) and 1.9 × 10<sup>4</sup> TO h<sup>-1</sup> for 4b (70 °C), affording stable polyethylene dispersions. The phosphine complex 5b is active in the absence of a phosphine scavenger, with similar activities as 4b. Polyethylenes of typically Mw 3 × 10<sup>4 </sup>g mol<sup>-1</sup> (M<sub>w</sub>/M<sub>n</sub> 2.0−2.5) with 25−50 branches per 1000 carbon atoms and T<sub>m</sub> 94−112 °C are obtained. 2018-04-20T12:57:01Z

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