Abstract
The translational diffusion coefficient of polystyrene molecules in dilute theta solution with cyclohexane Dc was studied as a function of the polymer concentration c and the molar mass M by performing photon correlation (PC) measurements and by analyzing data from the literature. The molar mass dependence of the concentration dependent part of Dc was also calculated from the zero concentration extrapolated values with the corresponding effective hydrodynamic radii. For the calculations the Pyun-Fixman theory was applied which regards the polymer coils as soft, interpenetrable spheres with uniform segment density. A similar study has also been presented using data from several sedimentation measurements.
Published Version
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