COMMENT ON THE FREE-ENERGY FUNCTIONAL OF BLOCK COPOLYMER MELTS IN THE STRONG SEGREGATION LIMIT

In a previous study the authors have formulated a statistical theory of a microphase separation of block copolymer melts in the strong segregation limit. An elastic theory has also been developed for gently deformed periodic structures. However the elastic constants obtained are not consistent with those of calculated recently by a different method by Z.G. Wang and S.A. Safran. The main difference is the block ratio dependence of the equilibrium period D. The authors result shows a rather strong dependence of the block ratio f while Z.G. Wang and S.A. Safran have derived D independent of f. In this paper the origin of the above discrepancy has been explored.