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.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 22 July 1997 / Received in final form: 1 December 1997 / Accepted: 22 January 1998
Rights and permissions
About this article
Cite this article
Ohta, T., Nonomura, M. Elastic property of bilayer membrane in copolymer-homopolymer mixtures. Eur. Phys. J. B 2, 57–68 (1998). https://doi.org/10.1007/s100510050225
Issue Date:
DOI: https://doi.org/10.1007/s100510050225