Literature DB >> 17032766

Nuclearity and cooperativity effects in binuclear catalysts and cocatalysts for olefin polymerization.

Hongbo Li1, Tobin J Marks.   

Abstract

A series of bimetallic organo-group 4 "constrained geometry" catalysts and binuclear bisborane and bisborate cocatalysts have been synthesized to probe catalyst center-catalyst center cooperativity effects on olefin enchainment in homogenous olefin polymerization and copolymerization processes. Significant nuclearity effects are found versus mononuclear controls, and the effect can be correlated with metal-metal approach distances and ion pairing effects. Novel polymer structures can be obtained by using such binuclear catalyst/cocatalyst systems.

Entities:  

Year:  2006        PMID： 17032766      PMCID： PMC1622821          DOI： 10.1073/pnas.0603396103

Source DB:  PubMed          Journal:  Proc Natl Acad Sci U S A        ISSN： 0027-8424            Impact factor:   11.205


  17 in total

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4.  Polynuclear olefin polymerization catalysis: proximity and cocatalyst effects lead to significantly increased polyethylene molecular weight and comonomer enchainment levels.

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Authors:  Stewart P Lewis; Lee D Henderson; Brett D Chandler; Masood Parvez; Warren E Piers; Scott Collins
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8.  Polynuclear catalysis: enhancement of enchainment cooperativity between different single-site olefin polymerization catalysts by ion pairing with a binuclear cocatalyst.

Authors:  Graham P Abramo; Liting Li; Tobin J Marks
Journal:  J Am Chem Soc       Date:  2002-11-27       Impact factor: 15.419

9.  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.

Authors:  Hongbo Li; Liting Li; Tobin J Marks; Louise Liable-Sands; Arnold L Rheingold
Journal:  J Am Chem Soc       Date:  2003-09-10       Impact factor: 15.419

10.  Bimetallic catalysis for styrene homopolymerization and ethylene-styrene copolymerization. Exceptional comonomer selectivity and insertion regiochemistry.

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4.  Bimetallic Zr,Zr-Hydride Complexes in Zirconocene Catalyzed Alkene Dimerization.

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5.  Effect of para-Substituents in Ethylene Copolymerizations with 1-Decene, 1-Dodecene, and with 2-Methyl-1-Pentene Using Phenoxide Modified Half-Titanocenes-MAO Catalyst Systems.

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