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The ordered mesostructures formed by block copolymers on the nanoscale via the self-assembly have attracted a lot of attention of high-performance material science due to its important, potential applications, especially the single gyroid network, single diamond network, and the single plumber′s nightmare (SPN) network. These three networks are very important in the fields of three-dimensional photonic crystals. Whereas single gyroid and single diamond have been stabilized in block copolymers by adjusting the chain architectures, blending, and using multicomponent systems, so far, no effective way has been found to stabilize the SPN network. Considering such situations, by designing B1A1B2A2C3B3, B1A1B2A2C3, B1A1C2B2A2C3, B1A1C2A2C3, and B1C1A1C2A2C3 multiblock copolymers and based on the simple cubic spheres to generate the unstable states via the rapid-component change of blocks, C, from B to A, the nonequilibrium kinetics of structural evolution starting from these unstable states and the corresponding mechanism as well as the effects from the number, position, and size of blocks, C, are explored. The exploration indicates that the metastable SPN network can be reached by the nonequilibrium kinetics of structural evolution after the rapid-component change of blocks, C, within a relatively wide range of volume-fraction A, which is mainly because that the symmetry of simple cubic spheres is the same as that of SPN (No.221 space group）. [ABSTRACT FROM AUTHOR]

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