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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2010

Structure of self-organized diblock copolymer solutions in partially miscible solvents

Résumé

A diblock copolymer dissolved in a mixture of partially miscible solvents creates a self-organized microemulsion with a morphology that depends on the numerous parameters of the system. We discuss one particular case of spherical particles (containing the minority solvent) forming a hard gel with cubic structure and demonstrate using high-resolution synchrotron scattering experiments that the self-organized solution has a BCC structure. After fitting one- and two-dimensional form factors we extract from the data the one- and two-dimensional structure factors, S(q) and S(q,j). The experimental S(q) corresponds almost quantitatively, up to the 9th order Bragg peak, to that calculated numerically for a randomly-oriented, finite-size BCC crystal. S(q,j) contains a large number of reflections that allow the structure to be identified more exactly as a twin BCC morphology with some imperfections. Examination of the dependence of the structural parameters on polymer concentration reveals that the dilution law predicted theoretically for the center-to-center distance of the spheres is confirmed experimentally while the size of the spherical objects does not follow theoretical predictions due to chain extension with increasing concentration.

Dates et versions

hal-00471510 , version 1 (08-04-2010)

Identifiants

Citer

Petr Stepanek, Zdnek Tuzar, Petr Kadlec, Frédéric Nallet, Nadya Pesce da Silveira. Structure of self-organized diblock copolymer solutions in partially miscible solvents. Physical Chemistry Chemical Physics, 2010, 12, pp. 2944-2949. ⟨10.1039/b917506g⟩. ⟨hal-00471510⟩

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