Аннотация:Being inspired by recent theoretical findings in block copolymer ordering we present, within the simplest version of the Landau weak crystallization theory, a consistent treatment of the thin film thermodynamics. It is first shown that a proper design of the period of 1D modulated substrate results in the formation of a 3D morphology whose symmetry is close to a cubic diamomd one and differs from the latter that due to a symmetry violation caused by the block copolymer - substrate interaction. The corresponding phase portraits are build. With decrease of the temperature the diamond-like morphology becomes less stable until it turns (via the 1st order phase transition) into the lamellar phase. On the contrary, with increase of the substrate selectivity the lamellae becomes less stable and, finally, turns into the diamond-like morphology.
