M M Hossain
Articles written in Bulletin of Materials Science
Volume 15 Issue 2 April 1992 pp 153-159
The absorption characteristics of polyimides and polyimide fluorocarbon polymer films were studied at different weathering conditions and after thermal aging. The absorption current increased while the resorption current showed greater time dependence in the presence of humidity. The magnitudes of the residual voltage decreased with increase of humidity and temperature, but increased after thermal aging. The absorption and resorption current also did not satisfy the traditional Curie-Von Schweidler law after weathering and aging.
Volume 16 Issue 6 December 1993 pp 699-707
Dielectric breakdown strength and diffusion characteristics were measured for polyimide and polyimide fluorocarbon polymer film at different weathering conditions. The dielectric breakdown strength and the diffusion coefficient were found to decrease in humid conditions. Different diffusion characteristics as well as breakdown mechanisms were observed on both sides in the PMF-1 polymer film. The permeation coefficient and diffusion coefficient decrease, thereby increasing the breakdown strength in more humid conditions that may be due to the formation of double potential well in the polymer film.
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