Origin of temperature dependent conductivity of $\alpha$-polyvinylidene   fluoride
  The conductivity of $\alpha$-polyvinylidene fluoride ($\alpha$-PVDF) is obtained from dielectric measurements performed in the frequency domain at several temperatures. At temperatures above the glass-transition, the conductivity can be interpreted as an ionic conductivity, which confirms earlier results reported in the literature. Our investigation shows that the observed ionic conductivity is closely related to the amorphous phase of the polymer. 
Enis Tuncer, Michael Wegener, Peter Fr\"ubing and Reimund   Gerhard-Multhaupt