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The phase behaviour of blends of ABC triblock and ac diblock copolymers isexamined using self-consistent field theory. Several equilibrium lamellarstructures are observed, depending on the volume fraction of the diblocks,phi_2, the monomer interactions, and the degrees of polymerization of thecopolymers. For segregations just above the order-disorder transition thetriblocks and diblocks mix together to form centrosymmetric lamellae. As thesegregation is increased the triblocks and diblocks spatially separate eitherby macrophase-separating, or by forming a non-centrosymmetric (NCS) phase ofalternating layers of triblock and diblock (...ABCcaABCca...). The NCS phase isstable over a narrow region near phi_2=0.4. This region is widest near thecritical point on the phase coexistence curve and narrows to terminate at atriple point at higher segregation. Above the triple point there is two-phasecoexistence between almost pure triblock and diblock phases. The theoreticalphase diagram is consistent with experiments.Comment: 9 pages, 8 figures, submitted to Macromolecule

Noncentrosymmetric Lamellar Phase in Blends of ABC Triblock and ac Diblock Copolymers