Fabrication and Dielectric Characterization of Advanced BaTiO3/Polyimide Nanocomposite Films with High Thermal Stability

Authors

  • Zhi-Min Dang,

    Corresponding author
    1. Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials & Key Laboratory of the Ministry of Education on Nanomaterials, Beijing University of Chemical Technology, Beijing 100029 (P. R. China)
    2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049 (P. R. China)
    • Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials & Key Laboratory of the Ministry of Education on Nanomaterials Beijing University of Chemical Technology Beijing 100029 (P. R. China).
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  • You-Qin Lin,

    1. Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials & Key Laboratory of the Ministry of Education on Nanomaterials, Beijing University of Chemical Technology, Beijing 100029 (P. R. China)
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  • Hai-Ping Xu,

    1. Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials & Key Laboratory of the Ministry of Education on Nanomaterials, Beijing University of Chemical Technology, Beijing 100029 (P. R. China)
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  • Chang-Yong Shi,

    1. Beijing University of Clothing Technology, Beijing 100029 (P. R. China)
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  • Sheng-Tao Li,

    1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049 (P. R. China)
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  • Jinbo Bai

    1. Lab. MSSMAT, CNRS UMR 8579, Ecole Centrale de Paris, Grande Voie des Vignes, Châtenay Malabry CEDEX 92295 (France)
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  • This work was financially supported by NSF of China (Grant No 50677002), the Ministry of Education of China through Doctor Project (Grant No 20050010010) and Key Lab of the Ministry of Education for Nanomaterials, NSF of Beijing City, and Program for New Century Excellent Talents in University (NCET).

Abstract

Barium titanate/polyimide (BaTiO3/PI) nanocomposite films with high dielectric permittivity (20), high breakdown strength (67 MV m−1), and high thermal stability are prepared by an in-situ polymerization process. A very thin polymer layer (about 5 nm) is coated on the surface of nanosized BaTiO3 particles to form a core–shell-like structure, which can guarantee homogeneous dispersion of the BaTiO3 particles in the PI matrix. It is confirmed that the core–shell-like structure originates from both the electrostatic attraction between the precursor poly(amic acid) (PAA) and the BaTiO3 particles and the hydrogen bond interaction between PI and the BaTiO3 particles. Such a structure also has some influence on the dielectric properties and breakdown strength of films. After casting and degassing of the sticky film, the dielectric permittivity of the nanocomposite film is close to or even higher than that of submicrocomposite films, which is attributed to the advanced interfacial structure between the BaTiO3 and PI phases.

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