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Polymer composites filled with core–shell structured nanofillers: effects of shell thickness on dielectric and thermal properties of composites

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A Correction to this article was published on 03 February 2022

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Abstract

In this study, we explore poly(vinylidene fluoride) (PVDF) filled with the core–shell nanofillers of silicon dioxide-coated β-silicon carbide whisker (β-SiCw@SiO2), and investigate the effects of core–shell structure and shell thickness on the composite thermal and dielectric properties. The formation of an insulating SiO2 layer can not only substantially reduce the dielectric loss of polymer composites but also suppress their dielectric constant (k). Further increasing shell thickness continues inhibiting the dielectric loss while rendering the k nearly unaffected. We attribute the underlying mechanism to the different effects of shell thickness on long-range and short-range charge migration. In addition to the constraint on charge transport, the SiO2 shell improves the filler–polymer interfacial compatibility and therefore leads to a large improvement in the thermal conductivity (TC) of the composites. The synthesized core–shell fillers afford high k and enhanced TC as well as low loss in the composites, which would enable a wide range of applications in dielectric and electrical fields.

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Funding

This work was supported by the National Natural Science Foundation of China (Nos. 51937007, 51577154), and has received support from the Analytic Instrumentation Center of XUST.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Xi’an University of Science & Technology, Xi’an, 710054, China

    Dan Cao, Wenying Zhou, Ting Li, Jin Li, Dengfeng Liu, Guangheng Wang & Juanjuan Zhou

  2. Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA

    Mengxue Yuan

  3. PolyK Technologies, State College, PA, 16803, USA

    Bo Li

  4. School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China

    Hongfang Zhang

Authors
  1. Dan Cao
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  2. Wenying Zhou
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  6. Jin Li
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DC, WZ, TL and JZ. Characterization and related discussion were performed by MY, BL, JL, DL, GW, HZ. Funding acquisition and Project administration was performed by WZ. The first draft of the manuscript was written by DC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Wenying Zhou, Mengxue Yuan or Hongfang Zhang.

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Cao, D., Zhou, W., Yuan, M. et al. Polymer composites filled with core–shell structured nanofillers: effects of shell thickness on dielectric and thermal properties of composites. J Mater Sci: Mater Electron 33, 5174–5189 (2022). https://doi.org/10.1007/s10854-022-07705-z

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