Vinyl-Polyethylene Waxes with Narrow Dispersity Obtained by Using a Thermally Robust [Bis(imino)trihydroquinolyl]chromium Catalyst
journal contributionposted 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.
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.
CitationEuropean Journal of Inorganic Chemistry, 2017 (36), pp. 4158-4166 (9)
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry
VersionAM (Accepted Manuscript)
Published inEuropean Journal of Inorganic Chemistry
PublisherWiley for ChemPubSoc Europe
NotesCreated 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.
Science & TechnologyPhysical SciencesChemistry, Inorganic & NuclearChemistryHomogeneous catalysisChromiumPolymerizationPolymersTridentate ligandsETHYLENE POLYMERIZATION BEHAVIORCHLORIDE COMPLEXES SYNTHESISHIGHLY LINEAR POLYETHYLENESTRANSITION-METAL COMPLEXESOLEFIN POLYMERIZATIONCHROMIUM(III) COMPLEXESTRIAZACYCLOHEXANE COMPLEXESALPHA-OLEFINSOLIGOMERIZATIONTRIMERIZATION