Highly Active Copper-Based Catalyst for Atom Transfer Radical Polymerization.
Atom transfer radical polymerization (ATRP) generally requires a catalyst/initiator molar ratio of 0.1 to 1 and catalyst/monomer molar ratio of 0.001 to 0.01 (i.e., catalyst concentration: 1000–10 000 ppm versus monomer). Herein, we report a new copper-based complex CuBr/N,N,W,N'-tetrakis(2-pyridylm...
| Publicado en: | Journal of the American Chemical Society Vol. 128; no. 50; pp. 16277 - 16286 |
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| Autores principales: | , , , , , , , |
| Formato: | Artículo |
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American Chemical Society
12/20/2006
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=23545703&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 23545703 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 12/20/2006 vid: 128 iid: 50 pid: 997 pub: American Chemical Society artinfo: ui: 23545703 10.1021/ja0653369 ppf: 16277 ppct: 9 formats: tig: atl: Highly Active Copper-Based Catalyst for Atom Transfer Radical Polymerization. aug: au: Huadong Tang Arulsamy, Navamoney Radosz, Maciej Shen, Youqing Tsarevsky, Nicolay V. Braunecker, Wade A. Wei Tang Matyjaszewski, Krzysztof affil: Soft Materials Laboratory, Department of Chemical & Petroleum Engineering, University of Wyoming, 1000 East University Avenue, Laramie, Wyoming 82071 Department of Chemistry, University of Wyoming, 1000 East University Avenue, Laramie, Wyoming 82071 Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213 su: Copper Polymerization Monomers Molecular weights X-rays Optical diffraction sug: subj: Copper Polymerization Monomers Molecular weights X-rays Optical diffraction ab: Atom transfer radical polymerization (ATRP) generally requires a catalyst/initiator molar ratio of 0.1 to 1 and catalyst/monomer molar ratio of 0.001 to 0.01 (i.e., catalyst concentration: 1000–10 000 ppm versus monomer). Herein, we report a new copper-based complex CuBr/N,N,W,N'-tetrakis(2-pyridylmethyl)- ethylenediamine (TPEN) as a versatile and highly active catalyst for acrylic, methacrylic, and styrenic monomers. The catalyst mediated ATRP at a catalyst/initiator molar ratio of 0.005 and produced polymers with well-controlled molecular weights and low polydispersities. ATRP occurred even at a catalyst/initiator molar ratio as low as 0.001 with copper concentration in the produced polymers as low as 6—8 ppm (catalyst/ monomer molar ratio = 10). The catalyst structures were studied by X-ray diffraction and NMR spectroscopy. The activator CuBr/TPEN existed in solution as binuclear and mononuclear complexes in equilibrium but as a binuclear complex in its single crystals. The deactivator CuBr/TPEN complex was mononuclear. High stability and appropriate K (ATRP equilibrium constant) were found crucial for the catalyst working under high dilution or in coordinating solvents/monomers. This provides guidance for further design of highly active ATAP catalysts. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2006 holdings: @attributes: islocal: N |
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