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2007-01-01 - Article/Dans un journal avec peer-review - Anglais - 5 page(s)

Coulembier Olivier , Delcourt Cécile , Dubois Philippe , "Bulk polymerization of (L,L)-lactide using non-organometallic triazolium carbene: limited advantage" in The Open Macromolecules Journal, 1, 1-5

  • Codes CREF : Chimie macromoléculaire (DI1315), Chimie quantique (DI1321), Catalyses hétérogène et homogène (DI1334), Optique (DI1250)
  • Unités de recherche UMONS : Matériaux Polymères et Composites (S816), Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) The ring-opening polymerization (ROP) of L,L-lactide (L-LA) has been studied in bulk using alcohol (either methanol or benzyl alcohol) and 1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene carbene, 1, respectively as initiator and non-organometallic catalyst, over a range of temperature and alcohol-to-1 molar ratios. Although 1 is known to perfectly control the polymerization of L-LA in solution at 90°C, its efficiency in bulk is drastically decreased since its thermal instability limits the possibility to reach high molecular weight poly(L-lactide) (PL-LA). Under optimum conditions, PL-LA chains with average molecular weight up to 10,000 g.mol-1 have been obtained within 15 minutes and interestingly characterized by very narrow polydispersity indices. Compared to PL-LA conventionally prepared with stannous octoate as catalyst, the thermal stability proved remarkably enhanced when the ROP was promoted by 1.

Notes :
  • (Anglais) ISSN: 1874-3439
  • (Anglais) Lecture en ligne: http://www.bentham-open.org/pages/gen.php?file=1TOMACROJ.pdf