Online HPLC-NMR of PS-b-PMMA and Blends of PS and PMMA, 2-LCCC-NMR at Critical Conditions of PMMA

摘要

PS-b-PMMA copolymers and blends of PS and PMMA were analyzed by the online coupling of LC at the critical point of adsorption and H-1 NMR. The separation of the polymers was carried out at chromatographic conditions which correspond to the critical point of PMMA and the size exclusion mode of PS. It was shown that blends of PS and PMMA homopolymers could be well separated at critical conditions of PMMA. The analysis of both the copolymers and the blends were carried out by online coupled H-1 NMR. The block copolymers were analyzed with respect to the chemical composition. LCCC-NMR coupling was allowed to determine the individual blocks of the copolymers regarding molar mass. The data were compared with the separation at critical conditions of PS.