Analytical solutions describing the phase separation driven by a free energy functional containing a long-range interaction term

Chaos
Isamu OhnishiYushu Matsushita

Abstract

We are primarily concerned with the variational problem with long-range interaction. This functional represents the Gibbs free energy of the microphase separation of diblock copolymer melts. The critical points of this variational problem can be regarded as the thermodynamic equilibrium state of the phase separation phenomenon. Experimentally it is well-known in the diblock copolymer problem that the final equilibrium state prefers periodic structures such as lamellar, column, spherical, double-diamond geometries and so on. We are interested in the characterization of the periodic structure of the global minimizer of the functional (corresponding to the strong segregation limit). In this paper we completely determine the principal part of the asymptotic expansion of the period with respect to epsilon (interfacial thickness), namely, we estimate the higher order error term of the period with respect to epsilon in a mathematically rigorous way in one space dimension. Moreover, we decide clearly the dependency of the constant of proportion upon the ratio of the length of two homopolymers and upon the quench depth. In the last section, we study the time evolution of the system. We first study the linear stability of spatially homog...Continue Reading

References

Jun 15, 1990·Physical Review. a·M Bahiana, Y Oono

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Citations

Jan 7, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·C B Muratov

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