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Hyphenation of Size Exclusion Chromatography with Selective Detectors

Hyphenation of Size Exclusion Chromatography with Selective Detectors [Pg.9]

Size exclusion chromatography is the premier polymer characterization method for determining molar mass distributions. In SEC, the separation mechanism is based on molecular hydrodynamic volume. For homopolymers, condensation polymers and strictly alternating copolymers, there is a correspondence between elution volume and molar mass. Thus, chemically similar polymer standards of known molar mass can be used for calibration. However, for SEC of random and block copolymers and branched polymers, no simple correspondence exists between elution volume and molar mass because of the possible compositional heterogeneity of these materials. As a result, molar mass calibration with polymer standards can introduce a considerable amount of error. To address this problem, selective detection techniques have to be combined with SEC separation. [Pg.9]




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Chromatography selection

Detector selectivity

Detector size

Detectors chromatography detector

Detectors, selective

Hyphenated

Hyphenation

Hyphens

Of detectors

Selective detectors, chromatography

Selectivity chromatography

Selectivity of detectors

Size chromatography

Size exclusion chromatography with

Size exclusion selectivity

Size-exclusion

Size-exclusion chromatography detectors

Size-exclusion chromatography selectivity

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