Ligand-Unsymmetrical Phenoxyiminato Dinickel Catalyst for High Molecular Weight Long-Chain Branched Polyethylenes

Dongxu Shu, Aidan R. Mouat, Casey J. Stephenson, Anna M. Invergo, Massimiliano Delferro, Tobin J Marks

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

An unsymmetrical bimetallic catalyst, (CF3/SO2)FI2-Ni2, having a CF3-functionalized phenoxyiminato Ni(II) center, which produces linear high-Mw polyolefin (CF3/Ni) joined to an adjacent SO2-functionalized phenoxyiminato Ni(II) center, which produces highly branched low-Mw polyolefin (SO2/Ni), was synthesized and fully characterized. In ethylene homopolymerizations, (CF3/SO2)FI2-Ni2 affords monomodal (D = 1.7), highly, long-chain branched (69 branches/1000 C) polyethylenes with Mw = 24 kg/mol. In contrast, bimetallic (CF3)FI2-Ni2 and (SO2)FI2-Ni2 produce high-Mw (25 kg/mol) exclusively methyl-branched (40 branches/1000 C) and low-Mw (4.5 kg/mol) highly branched (105 branches/1000 C) polyethylenes, respectively, while tandem monometallic (CF3)FI-Ni + (SO2)FI-Ni catalyst mixtures yield a bimodal polyolefin mixture (D = 6.4).

Original languageEnglish
Pages (from-to)1297-1301
Number of pages5
JournalACS Macro Letters
Volume4
Issue number11
DOIs
Publication statusPublished - Nov 6 2015

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Polyethylenes
Polyolefins
Molecular weight
Ligands
Catalysts
Homopolymerization
Ethylene
PL 732

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Ligand-Unsymmetrical Phenoxyiminato Dinickel Catalyst for High Molecular Weight Long-Chain Branched Polyethylenes. / Shu, Dongxu; Mouat, Aidan R.; Stephenson, Casey J.; Invergo, Anna M.; Delferro, Massimiliano; Marks, Tobin J.

In: ACS Macro Letters, Vol. 4, No. 11, 06.11.2015, p. 1297-1301.

Research output: Contribution to journalArticle

Shu, Dongxu ; Mouat, Aidan R. ; Stephenson, Casey J. ; Invergo, Anna M. ; Delferro, Massimiliano ; Marks, Tobin J. / Ligand-Unsymmetrical Phenoxyiminato Dinickel Catalyst for High Molecular Weight Long-Chain Branched Polyethylenes. In: ACS Macro Letters. 2015 ; Vol. 4, No. 11. pp. 1297-1301.
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