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The self-assembly of block copolymers containing rigid blocks have receivedabiding attention due to its rich phase behavior and potential for use in avariety of applications. In this work, under asymmetric interactions betweenrod/coil components, the self-assembly of coil/coil/rod ABC triblock copolymersis studied using self-consistent field of lattice model. In addition tomicelles, centrosymmetric lamellae (CSLM), lamellae, perforated lamellae,strips and gyroids, non-centrosymmetric (NCSLM) lamellae and wavy morphologiesare observed as stable phases. The phase diagram of interaction between rod andcoil components versus the rod fraction is constructed given a fixedinteraction between coil components. For intermediate rod fraction, degeneratebehavior is observed. NCSLM and CSLM are degenerate structures. It is foundthat the entropy of chain conformation plays an important role for this richbehavior. A mechanism of the degenerate behavior is proposed in coil/rod blockcopolymers under noncofinement. This study provides some new insights into thedegenerate behavior of block compolymers, which can offer a theoreticalreference for related experiments.

Self-assembly in rod/coil block copolymers: Degenerate behavior under nonconfinement