Some Comments and Corrections on the Defect Diffusion Models of Dielectric Relaxation

Abstract

AbstractAn attempt is made to improve the “defect‐diffusion model” initially proposed by Glarum. Some of the basic ideas underlying the model and assessing its success and rationality as applied to polymer relaxation are discussed. The model is generalized by developing a new one‐dimensional “molecular chain‐defect diffusion model”, namely, extending the single dipole relaxation to a linear chain molecular system. A dipole correlation function derived from this new model under various physical conditions, appears in the form of the Williams‐Watts empirical decay function φ(t) = exp [−(t/τ)γ] with 0 < γ ≦ 1. The results obtained lead to a molecular interpretation of this “universal” non‐exponential decay function.