Precision Block Copolymers

The recent discovery of unconventional spherical packing lattices, such as the Frank-Kasper phase and quasicrystalline phase, has challenged long-standing principles of block copolymer self-assembly. These findings represent significant advancements in fundamental polymer science and have greatly expanded the diversity of accessible nanostructures. However, understanding the underlying principles governing these phenomena has been significantly hindered by the inherent molecular defects of traditional block copolymers. To address this challenge, a discrete block copolymer system with precise chemical structures and uniform chain lengths has been developed. This system enables the detailed investigation of two critical factors: conformational asymmetry and chain length heterogeneity. By rationally designing a library of isomeric block copolymers with variations in size, composition, sequence, symmetry, and architecture, the fundamental principles driving the formation and evolution of these complex phases have been elucidated. The precision of this approach eliminates molecular uncertainties, providing an ideal platform for resolving complex phases with exceptionally high resolution.