Co-existing Morphologies of Lamellae and Double Arrays of Cylinders by A<SUB>1</SUB>BA<SUB>2</SUB>C Tetrablock Terpolymer
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초록
내용
A key prerequisite for applications of nanostructured block copolymer (BCP) self-assembly is the ability to generate complex geometries. Multiblock copolymer composed of more than three different chemicals is suitable for discovery of complex morphologies that have never been seen before. Here, we investigated, via SAXS and TEM, the morphology of polystyrene-b-polyisoprene-b-polystyrene-b-poly(2-vinylpyridine) (S1IS2V, 100k) tetrablock terpolymer. We discovered co-existing morphology of lamellae and cylinders. This co-existing structure consists of asymmetric lamellae and double arrays of cylinders slightly misaligned, and lamellae and cylinders are P2VP, PI respectively. The experimentally observed morphology is in good agreement with the predicted equilibrium phases by self-consistent filed theory (SCFT). Finally, we were able to develop vertically oriented this co-existing nanostructure by solvent annealing on the substrate.