Frequency dependence of the permittivity and loss factor for PI (a, c) and PAI (b, d) films between 200 °C and 400 °C. The loss factor is given by .
Examples of the fitting procedure of the dielectric data for PI at 300 °C (a, b) and PAI at 350 °C (c, d). The s parameter has been taken equal to 1 in the model.
Temperature-dependence of the dc conductivity of PI and PAI films.
Reciprocal temperature dependence of the charge carrier concentration for PI and PAI films. Solid lines represent Arrhenius linear fits.
Reciprocal temperature dependence of the charge mobility for PI and PAI films. Lines represent linear Arrhenius and non-linear VFT fits. Fitting parameters for PI: (Arrh. for T ≪ Tg ) μ∞ = 1.3 cm2 V−1 s−1, Ea = 0.75 eV. Fitting parameters for PAI: (VFT for T ≫ Tg ) μ∞ = 2.8 × 10−6 cm2 V−1 s−1, D = 0.78, T 0 = 513 K; (VFT for T ≈ Tg ) μ∞ = 2.2 × 10−3 cm2 V−1 s−1, D = 4.4, T 0 = 430 K.
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