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Issue 18, 2017
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Elastomeric polyethylenes accessible via ethylene homo-polymerization using an unsymmetrical α-diimino-nickel catalyst

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Abstract

Five types of unsymmetrical bis(arylimino)acenaphthenes, 1-[2,4,6-(CHPh2)3C6H2N]-2-(ArN)C2C10H6 (Ar = 2,6-Me2Ph L1, 2,6-Et2Ph L2, 2,6-i-Pr2Ph L3, 2,4,6-Me3Ph L4 and 2,6-Et2-4-MePh L5), each containing a single N-2,4,6-tribenzhydrylphenyl group, have been prepared and fully characterized. The interaction of L1–L5 with (DME)NiBr2 (DME = 1,2-dimethoxyethane) afforded the corresponding 1 : 1 nickel(II) bromide chelates, LNiBr2 (Ni1–Ni5), in good yield. Distorted tetrahedral geometries are a feature of the X-ray structures of Ni1 and Ni3; broad paramagnetically shifted peaks are seen in the 1H NMR spectra for all the nickel complexes in solution. Upon activation with relatively low amounts of Et2AlCl or Me2AlCl (200–700 equivalents), Ni1–Ni5 exhibited exceptionally high activities for ethylene polymerization (up to 1.07 × 107 g of PE (mol of Ni)−1 h−1), displayed good thermal stability [2.97 × 106 g of PE (mol of Ni)−1 h−1 even at 90 °C] and produced hyperbranched polyethylenes. Dynamic mechanical analysis and stress–strain testing reveal that the polymeric materials possess good elastomeric recovery and high elongation at break, indicating a promising alternative material to thermoplastic elastomers (TPEs).

Graphical abstract: Elastomeric polyethylenes accessible via ethylene homo-polymerization using an unsymmetrical α-diimino-nickel catalyst

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Publication details

The article was received on 14 Mar 2017, accepted on 05 Apr 2017 and first published on 05 Apr 2017


Article type: Paper
DOI: 10.1039/C7PY00434F
Citation: Polym. Chem., 2017,8, 2785-2795
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    Elastomeric polyethylenes accessible via ethylene homo-polymerization using an unsymmetrical α-diimino-nickel catalyst

    X. Wang, L. Fan, Y. Ma, C. Guo, G. A. Solan, Y. Sun and W. Sun, Polym. Chem., 2017, 8, 2785
    DOI: 10.1039/C7PY00434F

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