| 초록 |
Block copolymers, which are composed of two or more chemically different polymer blocks connected by covalent bonds, can self-assemble into periodically segregated nanostructures. The phase behavior of block copolymers is dictated by the Flory-Huggins interaction parameter (χ), volume fraction (f), and the degree of polymerization (N). In this study, we investigated the segregation behavior of poly(butyl acrylate)-b-poly(methyl methacrylate-r-styrene) (PBA-b-P(MMA-r-St)) where styrene was incorporated as a comonomer in the second block for controlling the incompatibility between two blocks. To examine the effect of styrene fraction (φ) on the segregation behaviors, the bulk morphologies of PBA-b-P(MMA-r-St) with different φ were characterized by small angle x-ray scattering (SAXS). The effective χ parameter was estimated by analyzing SAXS profiles with random phase approximation, which allowed us to quantify the degree of incompatibility of the block copolymer as a function of φ . |
