Polynuclear catalysis

Enhancement of enchainment cooperativity between different single-site olefin polymerization catalysts by ion pairing with a binuclear cocatalyst

Graham P. Abramo, Liting Li, Tobin J Marks

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

A new multicenter ethylene polymerization process is described whereby two different single-site catalysts, one competent for producing vinyl-terminated oligomers or macromonomers and one competent for producing high-molecular weight ethylene-α-olefin copolymers, are held in close spatial proximity via ion-pairing with a dianionic binuclear bis-borate cocatalyst. Ethylene polymerizations mediated by stoichiometrically appropriate quantities of Me2Si(tBuN)(η5-3-ethylindenyl)ZrMe2 and Me2Si(tBuN)(η5-C5Me4)TiMe2 activated by the bis-borate cocatalyst [Ph3C+]2[1,4-(C6F5)3BC6F4B(C6F5)3-2] yield a more homogeneous polyethylene product when compared to control polymerizations using the mononuclear activator [Ph3C+][B(C6F5)4-]. The bulk and spectroscopic properties of the polymer produced using the binuclear activator are consistent with highly branched polyethylene.

Original languageEnglish
Pages (from-to)13966-13967
Number of pages2
JournalJournal of the American Chemical Society
Volume124
Issue number47
DOIs
Publication statusPublished - Nov 27 2002

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Alkenes
Catalysis
Polymerization
Olefins
Ethylene
Borates
Polyethylene
Ions
Catalysts
Polyethylenes
Oligomers
Polymers
Copolymers
Molecular Weight
Molecular weight
ethylene

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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abstract = "A new multicenter ethylene polymerization process is described whereby two different single-site catalysts, one competent for producing vinyl-terminated oligomers or macromonomers and one competent for producing high-molecular weight ethylene-α-olefin copolymers, are held in close spatial proximity via ion-pairing with a dianionic binuclear bis-borate cocatalyst. Ethylene polymerizations mediated by stoichiometrically appropriate quantities of Me2Si(tBuN)(η5-3-ethylindenyl)ZrMe2 and Me2Si(tBuN)(η5-C5Me4)TiMe2 activated by the bis-borate cocatalyst [Ph3C+]2[1,4-(C6F5)3BC6F4B(C6F5)3-2] yield a more homogeneous polyethylene product when compared to control polymerizations using the mononuclear activator [Ph3C+][B(C6F5)4-]. The bulk and spectroscopic properties of the polymer produced using the binuclear activator are consistent with highly branched polyethylene.",
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AU - Marks, Tobin J

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