摘要
Inspired from ubiquitously found chiral polymers in living organisms, block copolymers composed of chiral entities (i.e., chiral block copolymers (BCPs*)) have emerged to engender chiral architectures via self-assembly. The solvent selectivity and polymer concentration play a pivotal role in the self-assembly of BCP∗ in solution, giving a wide variety of self-assembled textures from micellization, microphase separation, and crystallization. In this study, the formation of kinetic-controlled self-assembled unique topological nanostructures such as Moebius, figure-of-eight, and rectangular ribbons via microphase separation of BCP∗ in mixed solvents has been thoroughly substantiated through twisting and bending of a microphase-separated bilayer under appropriate conditions. The polymer concentration in mother liquid along with supersaturation did show apparent dependence on the obtained morphology. The formation of vesicles could be observed in the solution with a lower concentration region, whereas crystallization dominates at a higher concentration region, giving a window of concentration for the formation of microphase-separated topographic nanostructures in mixed solvents. By taking advantage of homochiral evolution from self-assembly, preferred helicity of forming Moebius ribbons can be obtained. In contrast to the single twist for the Moebius ribbons, multiple twisting can be fashioned, as evidenced by the formation of the figure-of-eight and rectangular ribbons with double twists and rationalized by the forming mechanisms from theories. This study may provide supplementary understanding of the morphological evolution from the self-assembly of BCPs in solution with kinetically controlled chiral superstructures.