Dielectric normal and segmental relaxation modes by extended irreversible thermodynamics (EIT)

The time rate change of the polarization vector of an isotropic polymer containing dipoles along the chain contour under an electric field is studied using the extended irreversible thermodynamics formalism. The analysis leads to the formulation of phenomenological equations of Havriliak-Negami for the dielectric permittivity that give a good account of the dielectric alpha and normal mode peaks associated, respectively, with the segmental modes and the motion of the whole chain