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Stefan-Meier-Str. 21
79104 Freiburg, Germany

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You are here: Home Events Prof. Philippe Guégan "New Propects in Anionic Polymerization: New Initiator Families and Challenging Monomers"

Prof. Philippe Guégan "New Propects in Anionic Polymerization: New Initiator Families and Challenging Monomers"

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Sorbonne Universités-UPMC, Institut Parisien de Chimie Moléculaire (IPCM), - UMR 8232 Chimie des Polymères, Paris, France

What
  • Seminar
When Jun 28, 2017
from 02:15 PM to 03:00 PM
Where Seminarraum B, FMF, Stefan-Meier-Str. 21, Freiburg
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Anionic polymerization has been, for a long time, the most versatile methodology to synthesize well-defined polymers with various controlled architecture, and a low amount of heterogeneity. The recent advent of phosphazene base as counter ion in anionic polymerization opened new perspectives in the design of macromolecular architectures. These super bases deprotonate poorly acidic molecules to generate highly reactive anions associated to phosphazenium cations, paving the way to new families of initiator precursors.

We first focused our investigations to the demonstration of the effective initiation of anionic polymerization by amid and urethane functions in the presence of a relevant phosphazenium counter cation, and a Lewis acid to some extent. The livingness of the polymerization was obtained for each of these new initiator families. The highly reactive growing species obtained by the deprotonation of any acidic monomer drove us to consider the polymerization of highly challenging monomers such as the glycidylphtalimide, cationically polymerized so far. The original combination of a phosphazenium counter anion and a Lewis acid allowed the (co)polymerization of this monomer to large molecular weight polymers, in a controlled manner.

 

invited by Pierre Lutz

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