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Elastic property of bilayer membrane in copolymer-homopolymer mixtures

  • T. Ohta
  • M. Nonomura
Article

Abstract:

We study the domain morphology in a phase separated state of diblock copolymer-homopolymer mixtures. In the situation that one of the blocks of copolymers is incompatible with homopolymers, formation of a bilayer membrane of block copolymers is shown to be possible in the matrix of homopolymers. Starting with the free energy functional in terms of the local volume fractions of each monomer, we derive the bending and curvature rigidities in the Helfrich free energy for a membrane. It is found that the curvature modulus is negative only in a limited region of the parameters, where a closed shape of a membrane like a vesicle is possibly formed. We establish a method to calculate the rigidities without a molecular picture in a consistent way with the field theoretic model free energy. Stability of a bilayer membrane compared with micelles is also investigated.

PACS. 64.60.Cn Order-disorder transformations, statistical mechanics of model systems 68.10.Et Interface elasticity, viscosity, and viscoelasticity - 82.65.Fr Film and membrane processes: ion exchange, dialysis, osmosis, electroosmosis 

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Copyright information

© EDP Sciences, Springer-Verlag 1998

Authors and Affiliations

  • T. Ohta
    • 1
  • M. Nonomura
    • 1
  1. 1.Department of Physics and Graduate School of Humanities and SciencesOchanomizu UniversityTokyoJapan

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