Abstract
Dielectric relaxation spectroscopy (DRS) was employed to study the dielectric and conductivity properties of poly(L-lactide) and poly(L-lactide)/ionic liquid (IL) blends. The experimental dielectric data were analyzed within the formalism of complex permittivity. The results were discussed in terms of AC conductivity, αN relaxation corresponding to the longest normal mode motion, α relaxation originating from the segmental mode motion, and DC conductivity. The results revealed that the motion of the polymer chains governs the charge carrier transport. The temperature dependence of the relaxation times follows the Vogel-Tammann-Fulcher (VTF) equation. The incorporation of IL into the matrix accelerates the segmental (α) and normal mode (αN) motions and the conductivity, and increases the charge carrier movement of IL following the longest αN motion of chains, which led to an increase in the relaxation strength of the αN relaxation.
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