Beyond native block copolymer morphologies. Issue 5 (25th September 2017) - Doerk, Gregory S.
Abstract : Block copolymers self-assemble into a range of canonical morphologies. Here, we review a broad range of techniques for inducing these materials to form structures beyond the 'native' morphologies seen in the bulk equilibrium phase diagram. Methods that exploit intrinsic encoding (molecular design) and external enforcement (directed assembly) are compared. Abstract : Block copolymers are a well-studied and canonical self-assembly paradigm. Despite active research, new methods are continually emerging that allow the formation of yet more diverse and complex morphologies. In this review, we analyze and comment on the state-of-the-art with respect to exploiting block copolymers in order to form 'non-native' morphologies; that is, structures that deviate from the bulk equilibrium morphologies observed in the simplest block copolymer systems. The range of reviewed strategies can be organized with respect to where the final structural information is encoded. Self-assembly involves intrinsic encoding within the molecules themselves, while external fields or templates can be used to externally encode a desired structure. Hybrid strategies, which exploit the responsiveness of self-assembly but control it through external forces or process history, are particularly promising.