Abstract
Abstract Two- and three-component polyether-polyurethanes were characterized by means of size exclusion chromatography (SEC)-multidetector methods. SEC was coupled with three or two detectors in series, a continuous viscometer (CVM), a low angle laser light scattering (LALLS) photometer and a differential refractometer (DR), or with CVM and DR. Molecular weight (MW) averages were determined independently by SEC-LALLS and by SEC using universal calibration (SEC-UC). MWs obtained by SEC-UC agreed with the corresponding SEC-LALLS MWs up to 60,000, but were higher for MWs over 60,000. This apparent increase in MW was attributed to the non-linearity of the calibration curve in the range of MW over 7.105. Due to high limiting viscosity number [η] of polyu-rethanes as compared to polystyrenes with the same MW, there was a big influence of concentration effects upon SEC when using calibration curves. For an accurate SEC-UC determination of the MW distribution, the parameter [η]c should be considered.
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