In general, the d.c. conductivity σ has been considered to be inversely proportional to the viscosity η, but the relation ση = const. has not been proven in the case of the system poly(vinyl chloride)‐dioctyl phthalate. The experimental results can be described by ση m ‐1/ m = constant if the plasticizer content is not too high. The ion mobility seems to depend on a local effective viscosity, which differs from that viscosity which is derived from retardation experiments.
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Juerg‐Heinrich Kallweit (1966) studied this question.
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