Structural properties of charged diblock copolymer solutions |
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| Authors: | P. Guenoun M. Delsanti D. Gazeau J.W. Mays D.C. Cook M. Tirrell M. Tirrell L. Auvray |
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| Affiliation: | (1) Service de Physique de l'Etat Condensé, C.E.A. Saclay, 91191 Gif-sur-Yvette Cedex, France, FR;(2) Service de Chimie Moléculaire, C.E.A. Saclay, 91191 Gif-sur-Yvette Cedex, France, FR;(3) Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA, US;(4) Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA, US;(5) Laboratoire Léon Brillouin, C.E.A. Saclay, 91191 Gif-sur-Yvette Cedex, France, FR |
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| 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. Received: 19 June 1997 / Received in final form: 4 September 1997 / Accepted: 9 October 1997 |
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| Keywords: | 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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