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Novel potassium sodium niobate/polyimide functional composite films with high dielectric permittivity
Author(s) -
Lin Jiaqi,
Zhang Panpan,
Yang Wenlong,
Xie Zhibin,
Liu Ying,
Lin Hui,
Li Xiaokang,
Lei Qingquan
Publication year - 2014
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.22742
Subject(s) - materials science , dielectric , composite material , potassium niobate , composite number , polyimide , permittivity , dielectric loss , conductivity , capacitance , layer (electronics) , ferroelectricity , electrode , optoelectronics , chemistry
This work reports the advanced potassium sodium niobate (K 0.5 Na 0.5 NbO 3 , KNN)/polyimide (KNN/PI) functional hybrid films with 5 vol%, 10 vol%, 20 vol%, 30 vol%, and 40 vol% KNN loaded. The structure, morphology, and dielectric properties of hybrid films have been measured. The results show that the KNN fillers are well dispersed in the PI matrix. An internal boundary layer capacitance structure is formed in the composite films. The dielectric permittivity of the film is as high as 22 when the concentration of KNN filler reaches 40 vol% at 10 2 Hz, which is five times larger than that of a pure PI matrix. Meanwhile, the loss tangent is lower than 0.05. In addition, the conductivity is lower than 10 −8 (S m −1 ) at 10 2 Hz, which indicates the excellent insulation and is important for the practical use of this kind of KNN/PI hybrid films. It is believed that the KNN/PI hybrid films could be applied in future electronic fields. POLYM. COMPOS., 35:969–974, 2014. © 2013 Society of Plastics Engineers