Abstract
Abstract The peak shape changes in differential viscometer (DV) chromatograms, shown in Part I of this series, were investigated. Chromatograms were obtained with narrow-molecular-weight distribution standards of increasing molecular weight. Peak shape changes were not observed when the DV detector was operated in series with the differential refractive index (DRI) detector rather than in parallel. Flowrate variations during elution of each sample in the parallel detector configuration appear to be the reason for the changes. At high molecular weights (≥460,000), polydispersity of the standards also contributed. Molecular weight averages of broad-molecular-weight distribution polymers were not affected by the detector configuration used. With a series configuration, a new method of determining interdetector volume and interpreting narrow-molecular-weight distribution polymers is presented.
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