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Improved dielectric strength and loss tangent by interface modification in PI@BCZT/PVDF nano-composite films with high permittivity

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Abstract

The Ba0.859 Ca0.141 Zr0.106 Ti0.894 (BCZT) nano-particles were modified by polyimide (PI) through a chemical coating method. And the PI@BCZT/polyvinylidene fluoride (PVDF) flexible composite films were fabricated by solution casting method. The transmission electron microscopy and scanning electron microscopy results show that the nano-particles is about 50 nm, PI is uniformly coated on the surface of BCZT nano-particles about 7–10 nm as well as there are uniform and improved dispersion in the matrix after modification. A series of dielectric properties were carried out. The results show the 50 vol% composites own a remarkably enhanced dielectric permittivity (εr = 130) at 100 Hz. After modification, the breakdown strength has increased from 20 to 96 kV mm−1 and the loss tangent is reduced from 1.8 to 0.2 at 100 Hz compare with un-modified composites in 40 vol% dopant. With the increase of dopant, ferroelectricity of composites can be enhanced. The optimal residual polarization is 40 vol% PI@BCZT composites, which possess 1.025 μC/cm2 under 50 kV/mm external electric field. In addition, after modification, thermo-gravimetric analysis exhibits the degradation temperature Td5% and Td10% of PI@BCZT/PVDF composites can be enhanced about 5–10 °C and show better thermal stability than un-modified composites.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 61372013), National Natural Science Foundation of Heilongjiang Province (Grant No. E201258).

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Authors and Affiliations

  1. School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, People’s Republic of China

    Haowei Lu & Lizhu Liu

  2. School of Applied Science, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China

    Jiaqi Lin & Wenlong Yang

  3. Key Laboratory of Engineering Dielectric and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China

    Jiaqi Lin & Lizhu Liu

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  1. Haowei Lu
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Correspondence to Wenlong Yang or Lizhu Liu.

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Lu, H., Lin, J., Yang, W. et al. Improved dielectric strength and loss tangent by interface modification in PI@BCZT/PVDF nano-composite films with high permittivity. J Mater Sci: Mater Electron 28, 13360–13370 (2017). https://doi.org/10.1007/s10854-017-7173-2

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