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Charge dynamics and morphology of Ultem 1000 and Ultem 5000 PEI grade films
Author(s) -
Krause E.,
Yang G. M.,
Sessler G. M.
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199805)46:1<59::aid-pi986>3.0.co;2-2
Subject(s) - polyetherimide , electret , materials science , polymer , thermal , charge (physics) , charge carrier , composite material , chemical physics , chemical engineering , chemistry , thermodynamics , optoelectronics , physics , quantum mechanics , engineering
Polyetherimide is a versatile polymer with interesting thermal properties ( T g above 200°C) that is already used in electrical engineering. It is of interest to investigate its electrical charge storage and decay processes, both to predict the degradation occurring under electrical load, but also for the purpose of using it in electret devices. The difference between two similar grades of Ultem PEI films, which have different charge decay processes, was studied. The more recently introduced grade, Ultem 5000, displays a charge decay which can be attributed to carrier drift. Ultem 1000 shows a slower decay process. Some microstructural effects, particularly related to the surface and its water absorption, may account for this important difference between two very similar polymers. © 1998 SCI.