Large-Scale Alignment of ABC Block Copolymer Microdomains via Solvent Vapor Treatment

摘要: We have studied the microdomain morphology of thin ABC triblock copolymer films supported by a solid substrate. The were exposed to various solvent vapors, and effect removal speed on resulting morphologies is investigated. Slow extraction rates lead parallel alignment lamellar microphases within plane film. On fast drying, perpendicular orientation lamellae found. In case block samples with highly anisotropic macroscopic shape, microdomains can be aligned over large lateral areas. results are discussed in view mechanical strain fields present during drying process.