Catalyst/cocatalyst nuclearity effects in single-site olefin polymerization. Significantly enhanced 1-octene and isobutene comonomer enchainment in ethylene polymerizations mediated by binuclear catalysts and cocatalysts

Hongbo Li, Liting Li, Tobin J Marks, Louise Liable-Sands, Arnold L. Rheingold

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114 Citations (Scopus)

Abstract

This Communication describes the implementation of a new binuclear homometallic organotitanium "constrained geometry catalyst" (CGC), (μ-CH2CH2-3,3′){ (η5-indenyl )[1-Me2Si (tBuN)](TiMe2)}2[EBICGC(TiMe2)2; Ti2], together with the bifunctional activators (Ph3C+)2[1,4-(C6F5)3BC6F4B(C6F5)3]2- (B2) and new bisborane 1,4-(C6F5)2BC6F4B(C6F5)2 (BN2) in ethylene + α-olefin copolymerization processes. Specifically examined are the comonomers 1-octene and poorly responsive isobutene. Large increases in comonomer enchainment efficiency into the polyethylene microstructure are observed versus the corresponding mononuclear catalyst [1-Me2Si(3-ethylindenyl)(tBuN)]TiMe2 (Ti1) + Ph3C+B(C6F5)4- (B1) or B(C6F5)3 (BN) under identical polymerization conditions. In ethylene + 1-octene copolymerization, 11 times more 1-octene incorporation is observed for Ti2 + B2 vs Ti1 + B1. In ethylene + isobutene copolymerization, 5 times more isobutene incorporation is observed for Ti2 + BN2 vs Ti1 + BN.

Original languageEnglish
Pages (from-to)10788-10789
Number of pages2
JournalJournal of the American Chemical Society
Volume125
Issue number36
DOIs
Publication statusPublished - Sep 10 2003

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Alkenes
Polymerization
Copolymerization
Olefins
Ethylene
Catalysts
Polyethylene
Polyethylenes
Microstructure
Geometry
Communication
isobutylene
ethylene
1-octene

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Catalyst/cocatalyst nuclearity effects in single-site olefin polymerization. Significantly enhanced 1-octene and isobutene comonomer enchainment in ethylene polymerizations mediated by binuclear catalysts and cocatalysts",
abstract = "This Communication describes the implementation of a new binuclear homometallic organotitanium {"}constrained geometry catalyst{"} (CGC), (μ-CH2CH2-3,3′){ (η5-indenyl )[1-Me2Si (tBuN)](TiMe2)}2[EBICGC(TiMe2)2; Ti2], together with the bifunctional activators (Ph3C+)2[1,4-(C6F5)3BC6F4B(C6F5)3]2- (B2) and new bisborane 1,4-(C6F5)2BC6F4B(C6F5)2 (BN2) in ethylene + α-olefin copolymerization processes. Specifically examined are the comonomers 1-octene and poorly responsive isobutene. Large increases in comonomer enchainment efficiency into the polyethylene microstructure are observed versus the corresponding mononuclear catalyst [1-Me2Si(3-ethylindenyl)(tBuN)]TiMe2 (Ti1) + Ph3C+B(C6F5)4- (B1) or B(C6F5)3 (BN) under identical polymerization conditions. In ethylene + 1-octene copolymerization, 11 times more 1-octene incorporation is observed for Ti2 + B2 vs Ti1 + B1. In ethylene + isobutene copolymerization, 5 times more isobutene incorporation is observed for Ti2 + BN2 vs Ti1 + BN.",
author = "Hongbo Li and Liting Li and Marks, {Tobin J} and Louise Liable-Sands and Rheingold, {Arnold L.}",
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T1 - Catalyst/cocatalyst nuclearity effects in single-site olefin polymerization. Significantly enhanced 1-octene and isobutene comonomer enchainment in ethylene polymerizations mediated by binuclear catalysts and cocatalysts

AU - Li, Hongbo

AU - Li, Liting

AU - Marks, Tobin J

AU - Liable-Sands, Louise

AU - Rheingold, Arnold L.

PY - 2003/9/10

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