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Electret Properties of Polyetherimides: Influence of Water Content and Comparison with Other High‐Temperature Polymer Films
Author(s) -
Frese Thomas,
Lovera Deliani,
Sandler Jan K. W.,
Lim Goy Teck,
Altstädt Volker,
Giesa Reiner,
Schmidt HansWerner
Publication year - 2007
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200600463
Subject(s) - materials science , electret , polyetherimide , polymer , polyimide , amorphous solid , isothermal process , annealing (glass) , surface charge , chemical engineering , composite material , organic chemistry , thermodynamics , chemistry , physics , layer (electronics) , engineering
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%.