POLYCATIONS .1. SODIUM, CALCIUM, AND SULFATE ION DIFFUSION-COEFFICIENTS IN AQUEOUS SALT-SOLUTIONS CONTAINING IONENE BROMIDES

Tracer diffusion coefficients for Na+, Ca2+, and SO42- ions were determined in aqueous solutions of the 3-3 and 4-4 ionene bromides, i.e., poly[(dimethylimino)propylene bromide] and poly[(dimethylimino) butylene bromide], respectively. The ionene bromide concentration ranged from 5.0 × 10-5 to 1.0 × 10-1 N, and the simple salt concentration ranged from 5.0 × 10-4 to 1.0 × 10-2 N. It was found that the diffusion coefficients for Na+ and Ca2+ ions had their same respective values in the presence and absence of polyelectrolyte. The SO42- ion diffusion coefficients exhibit similar behavior as do divalent Ca2+ counterions in solutions containing polyanions. The experimental values of the diffusion coefficients are correlated with those predicted by the Manning theory of polyelectrolyte solutions. © 1979, American Chemical Society. All rights reserved.