Structural properties of charged diblock copolymer solutions

  • P. Guenoun
  • M. Delsanti
  • D. Gazeau
  • J.W. Mays
  • D.C. Cook
  • M. Tirrell
  • M. Tirrell
  • L. Auvray

Abstract:

Aqueous micellar solutions of ionic/neutral block copolymers have been studied by light scattering, small angle neutron scattering and small angle X-ray scattering. We made use of a polymer comprised of a short hydrophobic block (polyethylene-propylene) PEP and of a long polyelectrolytic block (polystyrene-sulfonate) PSSNa which has been shown previously to micellize in water. The apparent polydispersity of these micelles is studied in detail, showing the existence of a few large aggregates coexisting with the population of micelles. Solutions of micelles are found to order above some threshold in polymer concentration. The order is liquid-like, as demonstrated by the evolution with concentration of the peak observed in the structure factor (\(\)), and the degree of order is found to be identical over a large range of concentrations (up to 20 wt%). Consistent values of the aggregation number of the micelles are found by independent methods. The effect of salt addition on the order is found to be weak.

PACS. 61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling - 83.70.Hq Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc. - 61.20.Qg Structure of associated liquids: electrolytes, molten salts, etc. 

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Copyright information

© EDP Sciences, Springer-Verlag 1998

Authors and Affiliations

  • P. Guenoun
    • 1
  • M. Delsanti
    • 2
  • D. Gazeau
    • 2
  • J.W. Mays
    • 3
  • D.C. Cook
    • 3
  • M. Tirrell
    • 4
  • M. Tirrell
    • 4
  • L. Auvray
    • 5
  1. 1.Service de Physique de l'Etat Condensé, C.E.A. Saclay, 91191 Gif-sur-Yvette Cedex, FranceFR
  2. 2.Service de Chimie Moléculaire, C.E.A. Saclay, 91191 Gif-sur-Yvette Cedex, FranceFR
  3. 3.Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, USAUS
  4. 4.Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USAUS
  5. 5.Laboratoire Léon Brillouin, C.E.A. Saclay, 91191 Gif-sur-Yvette Cedex, FranceFR

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