Ionic polymers or ionomers are emerging as important commercial polymers. They are cross-linked materials with thermally reversible behavior. The investigations on the dielectric behavior of a class of ionomers at microwave frequencies are performed employing cavity perturbation technique. Dielectric parameters such as the complex permittivity, conductivity, absorption coefficient and heating coefficient are estimated and the results are presented. (C) 2002 Elsevier Science B.V. All rights reserved.