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The phase behaviour of binary blends composed of A$_1$B$_1$ and A$_2$B$_2$diblock copolymers is systematically studied using the polymericself-consistent field theory, focusing on the formation and relative stabilityof various spherical packing phases. The results are summarized in a set ofphase diagrams covering a large phase space of the system. Besides the commonlyobserved body-centered-cubic (BCC) phase, complex spherical packing phasesincluding the Frank-Kasper A15 and $\sigma$ and the Laves C14 and C15 phasescould be stabilized by the addition of longer A$_2$B$_2$-copolymers toasymmetric A$_1$B$_1$-copolymers. Stabilizing the complex spherical packingphases requires that the added A$_2$B$_2$-copolymers have a longer A-block andan overall chain length at least comparable to the host copolymer chains. Adetailed analysis of the block distributions reveals the existence of inter-and intra-domain segregation of different copolymers, which depends sensitivelyon the copolymer length ratio and composition. The predicted phase behavioursof the A$_1$B$_1$/A$_2$B$_2$ diblock copolymer blends are in good agreementwith available experimental and theoretical results. The study demonstratedthat binary blends of diblock copolymers provide an efficient route to regulatethe emergence and stability of complex spherical packing phases.

Binary Blends of Diblock Copolymers: An Efficient Route to Complex Spherical Packing Phases