Volume 40, Number 5, December I 1997
|Page(s)||521 - 526|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Electrostatics in the self-assembly of macromolecular surfactants
Laboratoire de Dynamique des Fluides Complexes,
4 rue Blaise Pascal, 67070 Strasbourg, France
2 Max-Planck Institut für Polymerforschung, Postfach 3148, D-55021, Mainz, Germany
3 CNRS-Rhône-Poulenc, Complex Fluids Laboratory UMR166, Cranbury NJ 08512-7500, USA
4 Institut Max Von Laue/Paul Langevin, 38000 Grenoble, France
Accepted: 17 October 1997
We report on a small-angle neutron scattering (SANS) study of dilute solutions of neutral and charged polystyrene-polyisoprene (PS-b-PI) diblock copolymers in dimethyl acetamide (DMAc), a polar selective solvent for PS. This is a model macromolecular surfactant system: the low glass temperature of the PI block ensures that thermodynamic equilibrium can be attained; the ionic character of the copolymers is provided by a single sulfonate group at the free chain end of the PI block. The crossover from ionic to non-ionic behaviour is investigated by addition of salt. The results are compared to theoretical predictions for micellization of these model macromolecular systems.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc / 83.70.-f – Material form
© EDP Sciences, 1997
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