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2006-08-22 - Article/Dans un journal avec peer-review - Anglais - 12 page(s)

Coulembier Olivier , Lohmerijer B.G.G., Dove A.P., Culkin D.A., Mespouille Laetitia , Benight S.J., Dubois Philippe , Waymouth R.M., Hedrick James L., Pratt Russel C, "Alcohol adducts of N-heterocyclic carbenes: latent catalysts for the thermally-controlled living polymerization of cyclic esters" in Macromolecules, 39, 17, 5617-5628

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : Chimie macromoléculaire (DI1315), Catalyses hétérogène et homogène (DI1334)
  • Unités de recherche UMONS : Matériaux Polymères et Composites (S816)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) Alcohol adducts of the N-heterocyclic carbene, 1,3,4-triphenyl-4,5-dihydro-1H-1,2-triazol-5-ylidene (NHC), function as excellent single-component catalyst/initiators for the ring-opening polymerization of lactide and ß-butyrolactone. Their reversible dissociation at elevated temperatures generates alcohol and triazolylidene carbene to provide a facile entry to polymerization of cyclic esters on demand. Under optimum conditions, adverse transesterification reactions are minimized, and importantly, upon complete consumption of monomer, a second monomer addition facilitates additional polymer growth, even after precipitation. Block copolymers were prepared by combining disparate polymerization techniques from the use of oligo-adducts and bifunctional initiators. Additionally, more complex polymer architectures were prepared from multifunctional or dendritic initiators, further demonstrating the versatility of the N-heterocyclic carbene platform.

Notes :
  • (Anglais) Publié en ligne le 26 juillet 2006
Identifiants :
  • DOI : 10.1021/ma0611366