| 초록 |
Among many possible nanostructures in block copolymer self-assembly, helical nanostructures are particularly important because of potential applications for heterogeneous catalysts and plasmonic materials. In this work, we investigated, via small angle X-ray scattering and transmission electron microscopy, the morphology of polystyrene-block-polyisoprene-block-polystyrene-block-poly(2-vinyl pyridine) (S1IS2V) tetrablock terpolymer. Very interestingly, when the volume fraction of each block was 0.685, 0.125, 0.060, and 0.130, respectively, multidomain double-stranded helical nanostructure (MH2) was formed: P2VP chains became a core helix, and PI chains formed double-stranded helices surrounding the core helix. Core and double-stranded helices are connected by short PS2 chains, and PS1 chains become the matrix. The experimentally observed morphology is in good agreement with the prediction by self-consistent filed theory. We believe that this multidomain helical structure will be pave the way on the creation of multifunctional helical structures for various applications such as metamaterials. |
