| Abstract
| - Polyelectrolyte complexes have a wide range of applications for surface modification and flocculation andsorption of organic molecules from solutions. As an example, complexes between poly(diallyl dimethylammonium chloride) and poly(styrene sulfonate) have been investigated by diffusion and electrophoresisNMR. The formation of primary or soluble complexes is monitored. The hydrodynamic size is characterizedby the hydrodynamic radius, calculated from the diffusion coefficient determined by pulsed field gradientNMR. In the combination with electrophoresis NMR, the effective charge of the molecules and complexesis determined. The hydrodynamic size of the primary complex is smaller than that of the pure polyelectrolyteof the larger molecular weight, in the present case poly(styrene sulfonate), in solution, since charges arecompensated by the oppositely charged polyelectrolyte and hence the repelling forces diminish. The effectivecharge of the complexes is drastically reduced.
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