Reference : Synthesis of star and H-shape polymers via a combination of cobalt-mediated radical poly...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/100226
Synthesis of star and H-shape polymers via a combination of cobalt-mediated radical polymerization and nitrone mediated radical coupling reactions
English
Detrembleur, Christophe mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Debuigne, Antoine mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Altintas, Ozcan [Karlsruhe Institute of Technology (KIT), Germany > > Preparative Macromolecular Chemistry > >]
Conradi, Matthias [University of Hasselt > Institute for Materials Research (IMO) > Polymer Reaction Design Group > >]
Wong, Edgar H. H. [Karlsruhe Institute of Technology (KIT), Germany > > Preparative Macromolecular Chemistry > >]
Jérôme, Christine mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Barner-Kowollik, Christopher [Karlsruhe Institute of Technology (KIT), Germany > > Preparative Macromolecular Chemistry > >]
Junkers, Thomas [University of Hasselt > Institute for Materials Research (IMO) > Polymer Reaction Design Group > >]
Jan-2012
Polymer Chemistry
Royal Society Chemistry
3
1
135-147
Yes (verified by ORBi)
International
1759-9954
Cambridge
United Kingdom
[en] radical polymerization ; cobalt-mediated radical polymerization (CMRP) ; nitroxide-mediated polymerization (NMP) ; star-shaped polymer
[en] Via consecutive cobalt-mediated radical polymerization (CMRP), nitrone-mediated radical coupling (NMRC) and copper catalyzed azide-alkyne cycloaddition (CuAAC), polymers with mikto-arm star and H-shape architecture were synthesized. Poly(vinyl acetate)40-block-poly(acrylonitrile)78-Co(acac)2 polymers were synthesized via CMRC and subsequently coupled using an alkyne functional nitrone. The coupling efficiency of the NMRC process was assessed employing N-tert-butyl a-phenyl nitrone (PBN), which is structurally very similar to the later employed coupling agent. Generally, coupling efficiencies of close to 90% or higher were observed in all cases. Since the coupling reaction yields triblock copolymers bearing an alkoxyamine functionality (and thus also an alkyne group) in the middle of the chain, well defined PEG conjugates could be obtained via CuAAC. Miktoarm star polymers of the structure (PVAc-b-PAN)2-PEG were generated as well as H-shaped material of the structure (PVAc-b-PAN)2-PEG-(PVAc-b-PAN)2 via conjugation with bifunctional PEG. In all cases, very narrow molecular weight material was obtained. Molecular weight analysis of the intermediate and the final products reveals that the hydrodynamic volume of the miktoarm star and the H-shaped materials is not substantially increased during the final conjugation reaction despite the fact that the absolute molecular weight increases by more than a factor of two in the latter case. Success of the conjugation reactions was confirmed via composition analysis via NMR.
Center for Education and Research on Macromolecules (CERM)
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds Wetenschappelijk Onderzoek - FWO ; The Islamic Development Bank (IDB)
Researchers
http://hdl.handle.net/2268/100226
10.1039/c1py00297j
http://pubs.rsc.org/en/content/articlepdf/2012/py/c1py00297j

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