Abstract
Poly(styrene- block-methyl methacrylate)s were analysed by liquid chromatography at the critical point of adsorption. Operating at chromatographic conditions, corresponding to the critical mode of polystyrene and a size exclusion mode for poly(methyl methacrylate), the molar mass and the polydispersity of the poly(methyl methacrylate) block in the block copolymers was determined. The chemical composition of the block copolymers was obtained using size exclusion chromatography with coupled density-refractive index detection, and compared to data calculated from critical chromatography experiments. The agreement of the data obtained by the different methods was found to be very good.
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