Structural properties of charged diblock copolymer solutions

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

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

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 (qpeak ∝ c1/3), 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.

Original languageEnglish (US)
Pages (from-to)77-86
Number of pages10
JournalEuropean Physical Journal B
Volume1
Issue number1
DOIs
StatePublished - 1998
Externally publishedYes

Keywords

  • 61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling - 83.70.Hq Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc.

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