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Chromatographic investigations of macromolecules in the critical range of liquid chromatography, 10 . Polymer blend analysis using a viscosity detector
Author(s) -
Pasch Harald,
Rode Karsten
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970908
Subject(s) - molar mass , viscometer , chromatography , viscosity , polymer , chemistry , critical point (mathematics) , analytical chemistry (journal) , polymer blend , solvent , refractometry , capillary action , refractive index , materials science , organic chemistry , composite material , copolymer , mathematical analysis , mathematics , optoelectronics
Binary polymer blends were separated by liquid chromatography at the critical point of adsorption. By operating at chromatographic conditions corresponding to the critical point of one blend component, the blends were separated regardless of the molar mass distributions of the components. After the separation step both components were precisely detected by an on‐line capillary viscometer. In contrast to refractive index detection, where a strong solvent peak appears in most cases, the viscosity signal is not affected by sight deviations in the mobile phase composition. Under critical conditions of adsorption of one component both blend components exhibit normal Mark‐Houwink behaviour. Therefore, the viscosity detector in conjunction with a concentration detector can be used for determining the molar mass distribution of both blend components.