Clémence Lecoeur (Institut de Chimie des Matériaux de Paris-Est), présentera un séminaire le 10 mai 2016 à 15h intitulé : Comportement étonnant d’une solution concentrée de polylectrolyte
Attention : suite au déménagement de PHENIX, ce séminaire aura lieu Tour 43-44, Salle 317 (3e étage).
Résumé
Poly(methacrylic acid) (PMAA) is a very interesting polyelectrolyte known to undergo conformation changes when pH or/and ionic strength are modified. Both intermolecular hydrogen bonds between carboxyl groups on neighboring chains and hydrophobic interactions induced by the methyl lead to physical cross-links that are assumed to be responsible for the gel behavior in semi diluted and concentrated regime. These gel comportments appear in two really different condintions : by heating (fig 1 a) or shearing solution (fig 1 b) . Gels formed in both conditions forme completely different structure which we will study by combination of different technics (rheology, SANS…) to understand theire structure.
