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Frese, Thomas ; Lovera, Deliani ; Sandler, Jan K. W. ; Lim, Goy Teck ; Altstädt, Volker ; Giesa, Reiner ; Schmidt, Hans-Werner:
Electret Properties of Polyetherimides : Influence of Water Content and Comparison with other High-Temperature Polymer Films.
In: Macromolecular Materials and Engineering.
Bd. 292
(Mai 2007)
Heft 5
.
- S. 582-587.
ISSN 1439-2054
DOI: https://doi.org/10.1002/mame.200600463
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Abstract
In this comparative study, the charge storage performance of commercial high-temperature polymer films was evaluated and correlated with their chemical structure. Isothermal surface potential decay measurements after annealing periods at 90 °C revealed that amorphous polyetherimide (PEI) films showed the best charge storage behavior. Polyimide films showed reduced charge storage performance, whereas sulfur-containing polymer films are not suitable as electrets due to their fast charge decay. Additionally, the effect of water content in PEI films in the range of 0.02-0.79 wt.-% was studied. Increasing amounts of water decreased the charge storage properties proportionally, but only by a relatively smaller amount: the highest investigated water content of 0.79 wt.-% reduced the charge by only 30%.
