M M Hossain
Articles written in Pramana – Journal of Physics
Volume 31 Issue 5 November 1988 pp 413-420 Condensed Matter Physics
Charge storage and relaxation process of the polymide film electret were investigated using the thermally stimulated discharge current technique. Homo- and heterocharges were mainly observed up to and above the polarization temperature.
Volume 34 Issue 6 June 1990 pp 565-573
The absorption characteristics of polyimide (PM) and polyimide fluorocarbon (PMF-2) polymer film were studied at temperatures ranging from 20 to 230°C. The glass transition or critical temperature of PMF-2 was found at 160°C. Conduction of PMF-2 was observed due to the upper fluorocarbon layer below the transition temperature while the middle PM layer is important above this temperature. The time-dependent absorption/resorption current does not satisfy the traditional Curie-Von Schweidler law. The experimental results of the absorption characteristics are analysed using a simple R-C circuit.
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