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We develop a theory to describe the reorientation phenomena in the lamellarphase of block copolymer melt under reciprocating shear flow. We show thatsimilar to the steady-shear, the oscillating flow anisotropically suppressesfluctuations and gives rise to the parallel-perpendicular orientationtransition. The experimentally observed high-frequency reverse transition isexplained in terms of interaction between the melt and the shear-cell walls.Comment: RevTex, 3 pages, 1 figure, submitted to PR

Orientations of the lamellar phase of block copolymer melts under oscillatory shear flow