Relationship between Ionic Mobility and Segmental Mobility in Polymers in the Liquid State

摘要: Temperature and pressure dependences of the ionic d.c. conductivity σ(∞σ) segmental mobility (∞τ−1) were analysed in terms WLF Ferry–Stratton(FS) equations, respectively, where τ is dielectric relaxation time for motion above glass transition. The parameter C2 σ nearly equal to that τ−1, FS b2 also τ−1 some cases. In other cases, however, this does not hold. If μ are assumed be described by same C2, former cases correspond a constant carrier density latter variable density. case density, relation σ(T, P) [τ(T, P)]m=const. derived from experimental results. This designated as “modified Walden’s rule.” exponent m given ratio C1(σ)/C1(τ−1) or b1(σ)/b1(τ−1). physical meaning critical hole size charge transport motion.