Prediction of the concentration dependence of diffusion coefficients of polymers in solution

摘要

AbstractThe hydrodynamic volumes of solvated polymers shrink with increasing concentrations in solution until a concentration (cx) is reached at which the effective dimensions are those of a Theta solvent. A simple model (Ref. 7) can be used to calculate the volume fraction of solvated polymer coils as a function of concentration. From this, the concentration dependence of diffusion coefficients can be estimated (Ref. 5). Calculated data are in very good agreement with experimental values except for some lower molecular weight polymers in poor solvents.