Dział Polimerów CBMiM PAN w Łodzi zaprasza na wykład, który wygłosi
prof. Olivier Coulembier, Laboratory of Polymeric and Composite Materials,
University of Mons, Belgium
Tytuł wykładu: “Valuable Interests of DBU & TBD Superbases for the Ring-Opening Polymerization of Lactones.”
Sala 09, Budynek A
CBMiM PAN, Sienkiewicza 112
Streszczenie wykładu:
Organic catalysis in ring-opening polymerization (ROP) has become a powerful alternative to more traditional metal-based catalysts. The field has developed to a point at which there are not only excellent low cost and easy to use organocatalysts for day-to-day polymerizations, but the ability to precisely control the synthesis of advanced polymer architectures and ROP monomers that are extremely challenging to polymerize with other catalysts now exists. Among the most successful and widely studied were the families of amidines and guanidines. Specifically, the commercially available base 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) has proven to be a valuable ROP catalyst and has been applied by a wide range of researchers. Extension of these studies to examine other organic bases revealed that the 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) is even more active for ROP that, in turn, present other interesting observations and opportunities in ROP. This presentation will highlight the key advances realized in our laboratory by using both DBU and TBD superbases. The discussion will include the reversible fixation of CO2 on growing polymer chains, the simultaneous “O-alkyl” and “O-acyl” scissions of lactones during the preparation of multi-block copolymers and the ability to operate polymerizations under cryogenic conditions leading to highly stereoselective ROP of meso– and rac-LA.
