Limiting sedimentation and diffusion coefficients of polyelectrolytes. The charge effect

General expressions relating the sedimentation and diffusion constants of polyelectrolytes to the friction properties of ionic components in multicomponent systems have been derived. A quantitative explanation of the charge effect with respect to the addition of a low‐molecular‐weight salt is given; special attention is laid on limiting laws according to the salt‐to‐polymer concentration ratio. The theory is applied to a simple model, the infinitely long rod‐like model, to illustrate the peculiar aspect of the charge effect in presence of salt.