Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Polyvilylidenefluoride-based Nanocomposite Films Induced-by Exfoliated Boron Nitride Nanosheets with Controlled Orientation

  • Cho, Hong-Baek (Department of Materials Science & Chemical Engineering, Hanyang University) ;
  • Nakayama, Tadachika (Extreme Energy-Density Research Institute, Nagaoka University of Technology) ;
  • Jeong, DaeYong (Department of Materials Science & Engineering, Inha University) ;
  • Tanaka, Satoshi (Extreme Energy-Density Research Institute, Nagaoka University of Technology) ;
  • Suematsu, Hisayuki (Extreme Energy-Density Research Institute, Nagaoka University of Technology) ;
  • Niihara, Koichi (Extreme Energy-Density Research Institute, Nagaoka University of Technology) ;
  • Choa, Yong-Ho (Department of Materials Science & Chemical Engineering, Hanyang University)
  • Received : 2015.09.24
  • Accepted : 2015.10.27
  • Published : 2015.10.31
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Abstract

Polyvinylidene fluoride (PVDF)-based nanocomposites are fabricated by incorporation of boron nitride (BN) nanosheets with anisotropic orientation for a potential high thermal conducting ferroelectric materials. The PVDF is dissolved in dimethylformamide (DMF) and homogeneously mixed with exfoliated BN nanosheets, which is then cast into a polyimide film under application of high magnetic fields (0.45~10 T), where the direction of the filler alignment was controlled. The BN nanosheets are exfoliated by a mixed way of solvothermal method and ultrasonication prior to incorporation into the PVDF-based polymer suspension. X-ray diffraction, scanning electron microscope and thermal diffusivity are measured for the characterization of the polymer nanocomposites. Analysis shows that BN nanosheets are exfoliated into the fewer layers, whose basal planes are oriented either perpendicular or parallel to the composite surfaces without necessitating the surface modification induced by high magnetic fields. Moreover, the nanocomposites show a dramatic thermal diffusivity enhancement of 1056% by BN nanosheets with perpendicular orientation in comparison with the pristine PVDF at 10 vol % of BN, which relies on the degree of filler orientation. The mechanism for the magnetic field-induced orientation of BN and enhancement of thermal property of PVDF-based composites by the BN assembly are elucidated.

Keywords

References

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