J. Phys. France
Volume 51, Numéro 19, octobre 1990
|Page(s)||2205 - 2226|
Kinetic theory of microphase separation in block copolymersE.L. Aero, S.A. Vakulenko et A.D. Vilesov
Institute of Macromolecular Compounds, USSR Academy of Sciences, V.O., Bolshoi pr. 31, 199004 Leningrad, U.S.S.R.
A semiphenomenological theory that has the advantage of taking into account nonlinear and nonlocal contributions in the free energy for microphase separation of block copolymers is proposed. A kinetic nonlinear equation defining the process of structure formation from a melt is obtained, and its analytical solution at the melt-structure transition temperature is examined. In this region, the structure formation proceeds in two stages. The first one is characterized by damping of all but stable Fourier-components of density distribution and the second, by stabilization of the amplitude of the distribution. Characteristic times of these processes are estimated. The applied approach allows a comparatively simple definition of lamellar, hexagonal and body-centered cubic structures near Ts. Equilibrium structures at T <<; Ts are described as well.
6141 - Polymers, elastomers, and plastics.
6125H - Macromolecular and polymer solutions; polymer melts; swelling.
6475 - Solubility, segregation, and mixing; phase separation.
free energy -- polymer structure -- segregation