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Improved dielectric properties of PVDF nanocomposites: a comparative study of noncovalent and covalent functionalization of MWCNTs

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Abstract

Polyvinylidene fluoride (PVDF) based nanocomposites with γ-oxo-pyrenebutyric acid-noncovalent modified multiwalled carbon nanotubes (denoted as PACNTs) and stearic acid-covalent modified MWCNTs (SACNTs) as nanofillers, were fabricated using solution-blending method and their dielectric properties were carefully investigated. γ-Oxo-pyrenebutyric acid (PA) or stearic acid (SA) can improve the dispersion of MWCNTs in PVDF matrix because of strong physical π–π interaction and the surface of MWCNTs grafted with SA respectively. The values of percolation threshold for PVDF/PACNTs and PVDF/SACNTs were determined to be 5.7 and 6.3 vol%, respectively. Higher dielectric permittivity and lower loss tangent of PVDF/PACNTs originates from remarkable interfacial polarization because PA have more contact area with MWCNTs and can reduce leakage current compared with SA.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (51603060).

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei, 230009, China

    Pei Xu, Gang Ruan, Zhaopei Cui & Yunsheng Ding

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  1. Pei Xu
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  2. Gang Ruan
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  3. Zhaopei Cui
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  4. Yunsheng Ding
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Correspondence to Pei Xu or Yunsheng Ding.

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Xu, P., Ruan, G., Cui, Z. et al. Improved dielectric properties of PVDF nanocomposites: a comparative study of noncovalent and covalent functionalization of MWCNTs. J Mater Sci: Mater Electron 29, 13112–13117 (2018). https://doi.org/10.1007/s10854-018-9433-1

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  • DOI: https://doi.org/10.1007/s10854-018-9433-1

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