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Dielectric Spectroscopy of Polyimide Films Treated by Nanosecond High Voltage Pulsed Driven Electrical Discharges in Water
Author(s) -
Miron Camelia,
Zhuang Jie,
Sava Ion,
Kruth Angela,
Weltmann KlausDieter,
Kolb Juergen F.
Publication year - 2016
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201500037
Subject(s) - polyimide , materials science , nanosecond , relative permittivity , dielectric , permittivity , plasma , analytical chemistry (journal) , distilled water , electrical resistivity and conductivity , composite material , chemistry , optoelectronics , electrical engineering , organic chemistry , chromatography , optics , laser , layer (electronics) , physics , quantum mechanics , engineering
Dielectric properties of aromatic polyimide films treated by nanosecond pulsed electrical discharges generated in distilled water were evaluated with respect to permittivity and its dependency on discharge time. The relative permittivity of the polyimide films decreased after treatment by water plasma. The largest decrease was observed after a short discharge time, from a value of 3.6 for the untreated sample to 1.92 for the 10 min plasma treated samples. XRD analysis has shown a slight increase of the degree of intermolecular ordering and stronger π–π interactions during plasma treatment over shorter periods of time. However, the distance between the chains was also increasing, giving rise to an increased free volume. This effect may be responsible for the decrease of the relative permittivity of the polymer film.