Abstract
The theoretical concept of polymer chromatography under “critical conditions” that allows the separation of oligomer samples by functional-type distribution is discussed. Calculation of the optimum conditions for the gradient separation of such mixtures for simultaneous determination of the molecular mass distribution and functional-type distribution is also considered. To ensure a correct evaluation of the molecular mass distribution of the polymer products, a precise method of exclusion chromatography involving an internal standard and correction of the calibration equation according to a characterized sample is suggested. Double detection, with a UV detector and a refractometer, makes it possible to estimate the role of low-molecular-weight fractions of polysulphone during heat-treatment, which influences the optical characteristics of polymers.
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