Structural evidence of charge renormalization in semi-dilute solutions of highly charged polyelectrolytes
LURE, CNRS-CEA-MESR, Université Paris-Sud, Bâtiment 209 D, 91405 Orsay Cedex, France
2 Laboratoire de Physico-Chimie Macromoléculaire, CNRS-Paris VI-ESPCI, 10 rue Vauquelin, 75231 Paris, France
3 Laboratoire de Physique de la Matière Condensée (URA 792) , CNRS-Collège de France, 11 place Marcelin-Berthelot, 75231 Paris, France
Published online: 15 May 1999
We show experimentally that Manning counterion condensation also leads to a renormalization of the charge density at high concentrations of highly charged, flexible, hydrophilic polyelectrolytes. Investigations by small angle neutron and X-ray scattering of semi-dilute solutions of poly(acrylamide-co-sodium-2-acrylamido-2-methylpropane sulfonate) at different charge densities above the condensation threshold, show that the scattering function is invariant with the charge density.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 61.10.Eq – X-ray scattering (including small-angle scattering) / 61.12.Ex – Neutron scattering techniques (including small-angle scattering)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999