Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes

Shaofeng Liu, Alessandro Motta, Massimiliano Delferro, Tobin J Marks

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

A heterobimetallic catalyst, {Ti - Cr}, consisting of a constrained-geometry titanium olefin polymerization center (CGCEtTi) covalently linked to a chromium bis(thioether)amine ethylene trimerization center (SNSCr) was synthesized and fully characterized. In ethylene homopolymerizations it affords linear low-density polyethylene with molecular weights as high as 460 kg·mol-1 and exclusively n-butyl branches in conversion-insensitive densities of ∼18 branches/1000 carbon atoms, which are ∼17 and ∼3 times (conversion-dependent), respectively, those achieved by tandem mononuclear CGCEtTi and SNSCr catalysts under identical reaction conditions.

Original languageEnglish
Pages (from-to)8830-8833
Number of pages4
JournalJournal of the American Chemical Society
Volume135
Issue number24
DOIs
Publication statusPublished - Jun 19 2013

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Polyethylenes
Chromium
Titanium
Ethylene
Catalysts
Linear low density polyethylenes
Alkenes
Polyethylene
Sulfides
Homopolymerization
Polymerization
Olefins
Amines
Carbon
Molecular Weight
Molecular weight
Atoms
Geometry
ethylene

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes. / Liu, Shaofeng; Motta, Alessandro; Delferro, Massimiliano; Marks, Tobin J.

In: Journal of the American Chemical Society, Vol. 135, No. 24, 19.06.2013, p. 8830-8833.

Research output: Contribution to journalArticle

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