Abstract
The study of advancing diffusion in diluted polymer solutions is an efficient method of determining macromolecular dimensions [1, 2]. Combined with other methods (sedimentation, viscosity, light scattering) the measurement of the diffusion coefficient D, makes it possible to obtain valuable information on macromolecular conformations and molecular weight. Unfortunately, existing methods of studying diffusion were developed only in relation to monodispersed substances which are rather rare. However, the diffusion coefficient determined experimentally is the mean value of the diffusion coefficients of the various components of the specimen studied. If the molecular-weight distribution of the specimen is sufficiently wide, the consideration of high-molecular weight components involves difficulty and the mean value of D is too high.
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