Laboratoire Léon Brillouin

UMR12 CEA-CNRS, Bât. 563 CEA Saclay

91191 Gif sur Yvette Cedex, France


BD diffusons les neutrons

img New regime in polyelectrolyte solutions  

Philippe Lorchat, Iuliia Konko, Jérôme Combet, Jacques Jestin, Albert Johner, André Laschewski, Sergei Obukhov, and Michel Rawiso

Usually polyelectrolyte solutions present a peak in the polyion/polyion structure factor for some value qof the momentum transfer (scattering vector). We describe a new regime in dense polymer solutions, typically above 1mol/L, where qis proportional to the concentration c of the solution. It is however not observed for all polyelectrolytes but only for those of intermediate stiffness, usually together with an ultimate regime where qis proportional to c and local orientational order prevails. This regime is robust against sample preparation and stable over time. We can understand it as jammed with randomly oriented persistent segments. This may explain why fully developed nematic order is so difficult to observe in synthetic polyelectrolytes.

A. Menelle, dépêche du 20/03/2015

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