Thermoelectrets from Poly(acrylonitrile) Thin Films: A Trapped Charge Stability Study

Abstract:

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Thermoelectrets of poly(acrylonitrile) have been prepared for various electric field polarization strengths. The thermally stimulated discharge current technique has been used to study the remanent charge (dipolar and/or trapped charge) stability. The measurements were carried out in a vacuum. Two overlapping peaks and a significant increase of the current at high temperature have been observed. The first peak is centered around 372 K and the second one is centered around the polarization temperature. When the polarizing field increases from 0.47 to 1.2 MV m-1 the apparent activation energy varies from 1.08 to 1.40 eV, revealing a weak polarization field strength dependence, while the relaxation time at infinite temperature τ0 decreases from 2.05 x10 –15 to 1.05 x 10-18 s. The relaxation time at 300 K increases from 3.48 x 106 to 1.7 x 109 s indicating that the trapped electric charge may be stable at room temperature for the given polarization conditions.

Info:

Periodical:

Materials Science Forum (Volumes 514-516)

Edited by:

Paula Maria Vilarinho

Pages:

925-929

DOI:

10.4028/www.scientific.net/MSF.514-516.925

Citation:

J. N. Marat-Mendes, E. R. Neagu, "Thermoelectrets from Poly(acrylonitrile) Thin Films: A Trapped Charge Stability Study ", Materials Science Forum, Vols. 514-516, pp. 925-929, 2006

Online since:

May 2006

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$35.00

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