Abstract
Abstract In the frequency range between 0.4 and 40 GHz measurements of the complex dielectric spectrum of aqueous solutions of synthetic polymers have been carried out in the concentration range 0.7 ≤ c ≤ 12.5 mol/1 at a temperature of 25°C. The solutes are poly(ethylene imine), poly(propylene imine), polyacrylamide, and polymethacrylamide. Relaxation spectral functions based on a theoretical model of the solutions have been fitted to the measured spectra to derive values for the following parameters: (a) the hydration water relaxation time, (b) the number of affected water molecules per monomer unit of polymer, (c) the dielectric relaxation time of solute, and (d) the solute contribution to the static permittivity of solution. These data are compared with corresponding results for other polymers and for small-molecule substances as well. It is shown that there are no special hydration effects around the macromolecules and that in most solutions ionic polarization mechanisms seem to contribute to the dielectric spectrum besides the processes resulting from dipolar groups of solute.
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