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Dielectric Relaxation Spectroscopic Measurements on a Novel Electroactive Polyimide

Published online by Cambridge University Press:  10 February 2011

Saadi Abdul Jawad ,
Abdalla Alnajjar  and
Mamoun M. Bader
Saadi Abdul Jawad
Affiliation:
Department of Physics, The Hashemite University, P. O. Box 1504591, Zarqa, Jordan
Abdalla Alnajjar
Affiliation:
Department of Physics, Sharja University, Sharja, UAE
Mamoun M. Bader
Affiliation:
Department of Chemistry, Pennsylvania State University, Hazleton, PA 18201
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Abstract

AC electrical behavior of a novel aromatic electro-optic polyimide was investigated in the temperature range 25 °C to 300 °C and a frequency range from 1 Hz to 106 Hz. Three electrical quantities: impedance, permittivity and electric modulus are reported. The dependence of imaginary and real components of these quantities on temperature and frequency are discussed. The experimental results show that the polymer has high thermal stability below 200 °C, where the resistivity, dielectric constant and permittivity are nearly temperature-independent indicating highly rigid structure. Above this temperature, however, a well-defined broad peak corresponding to a relaxation process was observed for which the activation energy was calculated to be 8.5 Kcal/mole. This relaxation is associated with a restricted local rotational motion of the side chain chromophore.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 600: Symposium FF – Electroactive Polymers , 1999 , 311
Copyright
Copyright © Materials Research Society 2000

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