FEATURES OF COMPLEXING AND THE SOLUTION STRUCTURE FROM THE DATA ON ROTATIONAL AND TRANSLATIONAL MOBILITY OF MOLECULAR PROBES IN CELLULOSE-ACETATE SOLUTIONS

C-13 NMR relation and self-diffusion measurements of the molecular pro bes added to dimethyl sulfoxide-cellulose acetate solutions have been carried out as a function of concentration and degree of substitution of the polymers. The probes differ in their capacity for complexing wi th the hydroxyl groups of the cellulose acetate. Spin-lattice relaxati on rates and self-diffusion coefficients of the hydrogen-bonding probe s vary with the hydroxyl group content of the polymer, and the diffusi on coefficients of the inert probes are shown to be sensitive to the d ifference in the supermolecular organization of the solutions. The ana lysis of molecular probe hydrogen bonding with the polymers allows us to obtain information on the OH groups' binding capacity and their acc essibility at high polymer concentrations. The relaxation rates of bou nd species under the varied conditions are calculated.