Preparation and Dielectric Property of Al2O3 Surface Coating Modified BaTiO3/Polyimide Composite Film

Ya Jun Wang; Xiao Juan Wu; Chang Gen Feng

doi:10.4028/www.scientific.net/AMR.908.63

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 908Preparation and Dielectric Property of Al2O3...

Preparation and Dielectric Property of Al₂O₃ Surface Coating Modified BaTiO₃/Polyimide Composite Film

Abstract:

Polyimide (PI) was chosen as the matrix of the composite, barium titanate/polyimide (BT/PI) nanocomposite films were prepared by in situ polymerization. In order to improve the dispersion and the physical-chemical properties of BT surface, barium titanate was modified by Al₂O₃ coating and modified BT/PI nanocomposite films were prepared. The prepared modified BT was characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of the composites were characterized in detail. It was shown that surface modification with Al₂O₃ is the chemical process and there were new substances forming. When BT was modified by 10 wt% Al₂O₃, the dielectric constant of the composite film was 18.96 (10³ Hz), the loss tangent 0.005, breakdown strength 70 MV·m^-1, energy storage density 0.41 J·cm^-3. The dielectric constant of BT modified by Al₂O₃ is decreased while the dielectric strength of the modified BT/PI composite film is increased.

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Periodical:

Advanced Materials Research (Volume 908)

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63-66

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https://doi.org/10.4028/www.scientific.net/AMR.908.63

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Online since:

March 2014

Authors:

Ya Jun Wang*, Xiao Juan Wu, Chang Gen Feng

Keywords:

Dielectric Constant, Nanometer Barium Titanate, Polyimide, Storage Energy Density, Surface Coating Modification

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