Abstract
An iterative solution of the system of equations resulting from the Flory—Mandelkern equation and from the π-theorem was developed. The iteration involves experimental data for two unfractionated samples only, i.e., 2 values of intrinsic viscosity and 2 sets of sedimentation constants with the corresponding weight fractions. The efficiency of the iteration was shown for 21 samples of commercial poly(vinyl alcohol) (PVA) of different origin. Their degrees of hydrolysis were in the 97.7—99.4% range. The viscosity, sedimentation, and pycnometric measurements were done at 90°C in solutions which had been heated for 4 days in order to destroy the PVA associates. From sedimentation data at standard conditions, sedimentation constants were evaluated by a procedure which accounts for the concentration distribution along the ultracentrifuge cell due to the molecular mass distribution in the PVA samples. This in turn was determined from the sets of sedimentation constants and from the solution of the system of equations.
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Kalfus, M. Application of the Flory—Mandelkern Equation to Unfractionated Poly(vinyl alcohol) Samples. Polym J 10, 591–597 (1978). https://doi.org/10.1295/polymj.10.591
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DOI: https://doi.org/10.1295/polymj.10.591