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

In this study, we explore poly(vinylidene fluoride) (PVDF) filled with the core–shell nanofillers of silicon dioxide-coated β -silicon carbide whisker ( β -SiC w @SiO 2 ), and investigate the effects of core–shell structure and shell thickness on the composite thermal and dielectric properties. The...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-03, Vol.33 (8), p.5174-5189
Main Authors: Cao, Dan, Zhou, Wenying, Yuan, Mengxue, Li, Bo, Li, Ting, Li, Jin, Liu, Dengfeng, Wang, Guangheng, Zhou, Juanjuan, Zhang, Hongfang
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Charge transport
Chemistry and Materials Science
Core-shell structure
Dielectric loss
Dielectric properties
Fillers
Materials Science
Optical and Electronic Materials
Polymer matrix composites
Polymers
Polyvinylidene fluorides
Shells
Silicon carbide
Silicon dioxide
Thermal conductivity
Thermodynamic properties
Thickness
Vinylidene fluoride
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Summary:In this study, we explore poly(vinylidene fluoride) (PVDF) filled with the core–shell nanofillers of silicon dioxide-coated β -silicon carbide whisker ( β -SiC w @SiO 2 ), and investigate the effects of core–shell structure and shell thickness on the composite thermal and dielectric properties. The formation of an insulating SiO 2 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 SiO 2 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.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-07705-z