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 journalArticlepeer-review

63 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

ASJC Scopus subject areas

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

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