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Cobalt mediated radical polymerization (CMRP) : progress IN technology and macromolecular engineering

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  • Radical Polymerization
  • Cobalt-Mediated Radical Polymerization (Cmrp)
  • Physical
  • Chemical
  • Mathematical & Earth Sciences :: Chemistry [G01]
  • Physique
  • Chimie
  • Mathématiques & Sciences De La Terre :: Chimie [G01]
  • Engineering
  • Computing & Technology :: Materials Science & Engineering [C09]
  • Ingénierie
  • Informatique & Technologie :: Science Des Matériaux & Ingénierie [C09]
  • Communication
  • Engineering


Microsoft Word - abstract EPF 2007 A Debuigne.doc COBALT MEDIATED RADICAL POLYMERIZATION (CMRP) : PROGRESS IN TECHNOLOGY AND MACROMOLECULAR ENGINEERING. Debuigne A.*, Detrembleur Ch., Bryaskova R., Sciannamea, V., Piette Y., Jérôme R. Center for Education and Research on Macromolecules (CERM), University of Liège (ULG), Sart-Tilman, B6a, 4000 Liège, Belgium. A.D. is “Chargé de Recherche F.N.RS”. e-mail : . During the last few years, an increasing attention has been paid to the Organometallic Mediated Radical Polymerization (OMRP), with emphasis on cobalt complexes as reversible end- cappers of growing radical polymer chains (Figure 1). 1,2 * X X n * X X n Co-L Co-L+ X = -CO2CH3, -OCOCH3. L = acac2, porphyrin Figure 1 – Equilibrium between dormant and active species in Cobalt Mediated Radical Polymerization (CMRP). Recently, cobalt(II) acetylacetonate proved efficiency in the controlled radical polymerization of vinyl acetate and in the successful functionalization of poly(vinyl acetate) (PVAc) and derivatized poly(vinyl alcohol) (PVOH) (co)polymers. 2-4 In spite of substantial progress in Cobalt Mediated Radical Polymerization (CMRP), including extension to other monomers by Matyjaszewski et al., 5 and extension of CMRP to aqueous dispersions, 6 several questions remained pending, such as the implementation of the initiating system, the recovery and recycling of the metal. These issues will be discussed in this communication, together with recent progress in macromolecular engineering of PVAc and PVOH. Because CMRP of vinyl acetate is better controlled at low temperature (30°C), 2,2’-azo-bis(4- methoxy-2,4-dimethylvaleronitrile) (V-70) was used until now as an initiator. However, transportation and supplying of this initiator is quite an

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