Eur. Phys. J. Appl. Phys.
Volume 49, Number 1, January 2010
|Number of page(s)||7|
|Section||Physics of Organic Materials and Devices|
|Published online||26 November 2009|
Dielectric measurements in large frequency and temperature ranges of an aromatic polymer
Université de Toulouse, UPS-INPT, LAPLACE (Laboratoire Plasma et Conversion d'Énergie), 118 route de Narbonne, 31062 Toulouse Cedex 9, France
2 CNRS, LAPLACE, 31062 Toulouse, France
Corresponding author: firstname.lastname@example.org
Revised: 10 September 2009
Accepted: 12 October 2009
Published online: 26 November 2009
The characterization of the BPDA/PDA polyimide (PI) at high temperature up to 400 °C, thanks to dielectric relaxation spectroscopy (DRS) in the 10-1 Hz to 106 Hz frequency range, allows the determination of the dc electrical conductivity (σdc). In such a high temperature range, the dielectric spectra are modified by the extrinsic electrode polarization phenomenon (EP) response. A model is proposed which coupled to the DRS results allows evidencing and quantifying the effect of the EP. The proposed method gives a simple way to determine the intrinsic σdc values from the effective ac dielectric response, improving the accuracy and reducing the duration of measurement. For BPDA/PDA PI, the resulting σdc values range from 4 × 10-11 to 8 × 10-6 Ω-1 m-1 for temperatures between 200 and 400 °C, with an activation energy of the conduction phenomenon of 0.55 eV.
PACS: 72.20.-i – Conductivity phenomena in semiconductors and insulators / 77.22.-d – Dielectric properties of solids and liquids / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 2009
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