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- W2039560200 abstract "A recently developed hyphenated system for organic size-exclusion chromatography-pyrolysis-gas chromatography-mass spectrometry (SEC-Py-GC-MS) is adapted to allow the use of aqueous LC eluents as applied in the characterization of water-soluble polymers. The system uses syringe-based transfer of multiple LC-fractions to the GC instrument with solvent elimination and subsequent pyrolysis in a programmed temperature vaporization injector. The problems of the large-volume injections of aqueous, salt containing eluents into the Py-GC-MS are solved by using a 'sintered-bed liner' for elimination of the water at a high temperature, a volatile salt and the installation of a back-flush option. After optimization, the system was applied for the determination of the combined molecular weight-chemical composition of a polyethylene glycol-polypropylene glycol block copolymer. This analysis was done with the system in the aqueous SEC-Py-GC-MS mode. Also demonstrated is the automated at-line characterization of a random polystyrene-polymethylmethacrylate copolymer, now with the system in the gradient reversed-phase LC-Py-GC-MS mode. The methods proposed in the present work are very useful for the detailed characterization of water-soluble copolymers." @default.
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- W2039560200 date "2008-04-01" @default.
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- W2039560200 title "Hyphenation of aqueous liquid chromatography to pyrolysis-gas chromatography and mass spectrometry for the comprehensive characterization of water-soluble polymers" @default.
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- W2039560200 doi "https://doi.org/10.1016/j.chroma.2007.10.035" @default.
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