Phase Behavior of Polystyrene-b-poly(methyl methacrylate) Diblock Copolymer

摘要: The phase behavior of polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) copolymers various molecular weights has been studied by using small-angle X-ray scattering (SAXS) and depolarized light (DLS). empirical Flory χ, determined from intensity profiles for a fully disordered PS-b-PMMA copolymer, was shown to behave differently depending on temperature range. χ described mostly enthalpic contribution at higher temperatures, but dominant entropic appeared in lower temperatures. order−disorder transition (ODT) temperatures the series with controlled were directly measured through SAXS DLS. resultant ODTs then compared compressible random-phase approximation theory determine cross interactions between block components. It found that effective is also contribution, which yields moderate change ODT upon increase copolymer molecu...