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Vinyl-Polyethylene Waxes with Narrow Dispersity Obtained by Using a Thermally Robust [Bis(imino)trihydroquinolyl]chromium Catalyst

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journal contribution
posted on 08.08.2018, 14:03 by Chuanbing Huang, Youfu Zhang, Gregory A. Solan, Yanping Ma, Xinquan Hu, Yang Sun, Wen‐Hua Sun
Five structurally related chromium(III) complexes [2‐(ArNCMe)‐8‐(NAr)C9H8N]CrCl3 (Ar = 2,6‐Me2Ph: Cr1; 2,6‐Et2Ph: Cr2; 2,6‐iPr2Ph: Cr3; 2,4,6‐Me3Ph: Cr4; 2,6‐Et2‐4‐MePh: Cr5), each bearing an unsymmetrical bis(imino)trihydroquinoline ligand, were synthesized in good yield and fully characterized. The molecular structure of Cr2 reveals a distorted octahedral geometry at the metal center with the sterically bulky N,N,N ligand adopting a mer configuration. On activation with methylaluminoxane (MAO) or modified MAO, Cr1–Cr5 were highly active catalysts for ethylene polymerization operating most effectively at 80 °C [up to 15.96 × 106 g (PE)·mol–1 (Cr)·h–1]; even at 100 °C, the activity was still good [2.92 × 106 g (PE)·mol–1 (Cr)·h–1]. Highly linear polyethylene waxes of low molecular weight and narrow molecular weight distribution (polydispersity index: 1.1–1.8), incorporating predominantly vinyl/methyl and some methyl/methyl end groups were obtained. The influence of steric/electronic changes to the precatalyst and polymerization reaction parameters on the catalytic activity and the properties of the polymer product were the subject of a detailed investigation.

Funding

This work was supported by the National Natural Science Foundation of China (no. U1362204, 21473160, and 21374123).G. A. S. thanks the Chinese Academy of Sciences for a VisitingScientist Fellowship.

History

Citation

European Journal of Inorganic Chemistry, 2017 (36), pp. 4158-4166 (9)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

AM (Accepted Manuscript)

Published in

European Journal of Inorganic Chemistry

Publisher

Wiley for ChemPubSoc Europe

issn

1434-1948

eissn

1099-0682

Copyright date

2017

Available date

16/08/2018

Publisher version

https://onlinelibrary.wiley.com/doi/abs/10.1002/ejic.201700837

Notes

Created from template on behalf of author. The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en