TY - JOUR
T1 - Electrical and mechanical properties of polyimide films treated by plasma formed in water and isopropanol
AU - Sava, Ion
AU - Asandulesa, Mihai
AU - Zocher, Katja
AU - Kruth, Angela
AU - Kolb, Juergen F.
AU - Bodnar, Wiktor
AU - Witte, Kerstin
AU - Ishizaki, Takahiro
AU - Miron, Camelia
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Fluorinated aromatic polyimide films were treated by pulse electrical discharges formed in water or isopropanol. The relative permittivity, measured in large domains of frequencies and temperatures by broadband dielectric spectroscopy, slightly decreased after plasma discharge in both types of liquids. The dipolar relaxation calculated by Arrhenius equation showed that the liquid plasma treatment decreases the rotational potential energy barrier for non-cooperative motions of dipoles, as a consequence of an increased free volume of plasma exposed films. Higher values of hardness, Young's modulus, and an improved elongation were also measured for the plasma treated samples, indicating molecular rearrangements that occur after plasma treatment.
AB - Fluorinated aromatic polyimide films were treated by pulse electrical discharges formed in water or isopropanol. The relative permittivity, measured in large domains of frequencies and temperatures by broadband dielectric spectroscopy, slightly decreased after plasma discharge in both types of liquids. The dipolar relaxation calculated by Arrhenius equation showed that the liquid plasma treatment decreases the rotational potential energy barrier for non-cooperative motions of dipoles, as a consequence of an increased free volume of plasma exposed films. Higher values of hardness, Young's modulus, and an improved elongation were also measured for the plasma treated samples, indicating molecular rearrangements that occur after plasma treatment.
KW - Dielectric constant
KW - Plasma in liquids
KW - Polyimides
KW - Tensile strength
UR - http://www.scopus.com/inward/record.url?scp=85056488190&partnerID=8YFLogxK
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U2 - 10.1016/j.reactfunctpolym.2018.11.005
DO - 10.1016/j.reactfunctpolym.2018.11.005
M3 - Article
AN - SCOPUS:85056488190
SN - 1381-5148
VL - 134
SP - 22
EP - 30
JO - Reactive and Functional Polymers
JF - Reactive and Functional Polymers
ER -