Salt-induced counterion condensation and related phenomena in sodium carboxymethylcellulose-sodium halide-methanol-water quaternary systems.

Polyion-counterion interactions in sodium carboxymethylcellulose (NaCMC) in methanol-water media have been investigated conductometrically with reference to their variations with polyelectrolyte concentration, relative permittivity and the type and concentration of added electrolytes. The specific conductance data in polyelectrolyte-salt solutions were analyzed using an equation recently developed by us following the scaling description for the configuration of a polyion chain according to Dobrynin et al. Excellent quantitative agreement between the experimental results and those obtained with the new equation developed was observed.

Radii of gyration of sodium carboxymethylcellulose in aqueous and mixed solvent media from viscosity measurement.

The viscosities of three sodium carboxymethylcellulose samples with molecular weights of 90,000 [degree of substitution (DS): 0.7], 250,000 (DS: 0.9), and 700,000 (DS: 0.