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Séminaire Chimie ED459

Mechanically responsive and optically active polymers : playing with force, magnets and light

Dr. Yoan C. Simon (Adolphe Merkle Institute, Polymers and Materials Group, Université de Fribourg, Switzerland)

publié le

Le Jeudi 12 Décembre 2013 à 13h45
UM2, salle de cours SC-16.01

In order to direct the stimuli-responsiveness of polymeric materials, one must control their overall architectures, both at the molecular and supramolecular level. To achieve this goal, our group takes advantage of polymer chemistry and engineering to fabricate materials that will respond on command upon application of a given cue. Mechanoresponsive materials, i.e. materials that either respond mechanically to an external trigger (e.g. magnetic field, light,…) or that transduce mechanical force into a usable chemical potential will be broached and the design principles for such materials will be exposed. In particular, metallosupramolecular materials that exhibit a color change based on lanthanide to iron metal-exchange will be presented. These materials exhibit unique autonomous-mending properties upon application of ultrasonic waves. Finally, materials that act as frequency upconverters will be discussed. Examples based on both macromolecular constructs as well as small molecule will be shown. In those examples, it appears as evident that composition and morphological control are essential features to promote photon-conversion efficiency.

Contact local ICGM : Prof. Jean-Jacques Robin (équipe IAM)

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