ON THE GENERALIZED CONCENTRATION AND MOLECULAR MASS DEPENDENCIES OF MACROMOLECULAR SELF-DIFFUSION IN POLYMER-SOLUTIONS

Self-diffusion experimental data obtained with the n.m.r. pulsed gradient spin-echo method in polyethylene oxide (PEO), polystyrene (PS), dextran, gelatine, cellulose triacetate (CT), poly(dimethyl siloxane) (PDMS) solutions and melts in a wide range of solvents, with molecular mass (M) and concentration (φ), were analyzed to show the existence of common dependencies for Ds(M) and Ds(φ). The existence of the generalized f(φ/φ) was examined for the 17 different polymer-solvent systems. With the use of the generalized function nearly 100 Ds(φ) dependencies were described. The renormalization function L(φ) accounts for the local dynamic properties of the concentration dependence.