Effect of Modified Chemical Junction of a Diblock Copolymer on the Microphase Separation Behavior

A polystyrene-b-poly(methylmethacrylate) (PS-b-PMMA) modified with a fluorine-containing functional group at its chemical junction was designed to study the effect of on microphase separation behavior. Various molecular weights and unmodified PS-b-PMMA were synthesized, effective χ parameter for them estimated by small-angle X-ray scattering. The clearly observed in measured parameters block copolymers below 200 degree polymerization. In contrast, over polymerization showed quite similar behavior PS-b-PMMA.