Abstract
The lamellar superstructure formed in polydisperse block copolymer melts has been considered. For the narrow interphase approximation, a mean-field analytical theory has been developed. This theory relates the equilibrium parameters of the superstructure to the characteristics of the copolymer molecules: the average molecular weight, the type of polydispersity and the surface tension. It is shown that, in a binary mixture of long block copolymers (with different molecular weights and compositions), the formation of a single lamella with common period is under certain conditions thermodynamically more advantageous than the segregation of the system into lamellae formed by the mixture components. The structure of the lamellar layers is investigated in detail. Theoretical and experimental data are compared.
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