✦ LIBER ✦

Electret Properties of Polyetherimides: Influence of Water Content and Comparison with Other High-Temperature Polymer Films

✍ Scribed by Thomas Frese; Deliani Lovera; Jan K. W. Sandler; Goy Teck Lim; Volker Altstädt; Reiner Giesa; Hans-Werner Schmidt

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 193 KB
Volume: 292
Category: Article
ISSN: 1438-7492
DOI: 10.1002/mame.200600463

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✦ Synopsis

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%.

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