Polymer composites filled with core@double-shell structured fillers: Effects of multiple shells on dielectric and thermal properties

Polymer dielectrics with a high dielectric constant (high ε), low dielectric loss and high thermal conductivity (k) are constantly pursued for advanced electrical power systems, driven by the continuous demands of device miniaturization and high operating temperature. In this paper, we present an ef...

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Bibliographic Details
Published in:Composites science and technology 2019-09, Vol.181, p.107686, Article 107686
Main Authors: Zhou, Wenying, Kou, Yujia, Yuan, Mengxue, Li, Bo, Cai, Huiwu, Li, Zhen, Chen, Fuxin, Liu, Xiangrong, Wang, Guangheng, Chen, Qingguo, Dang, Zhi-Min
Format: Article
Language:English
Subjects:
Aluminum oxide
Composite materials
Core-shell structured fillers
Crystal structure
Crystallinity
Dielectric loss
Dielectric properties
Electric power
Electric power systems
Electric properties
Electrical resistivity
Fillers
Heat conductivity
Heat transfer
Interfacial polarization
Miniaturization
Operating temperature
Permittivity
Polymer matrix composites
Polymer-matrix composites (PMCs)
Polymers
Temperature effects
Thermal conductivity
Thermal properties
Thermodynamic properties
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Summary:Polymer dielectrics with a high dielectric constant (high ε), low dielectric loss and high thermal conductivity (k) are constantly pursued for advanced electrical power systems, driven by the continuous demands of device miniaturization and high operating temperature. In this paper, we present an effective approach to concurrently improve the dielectric properties and thermal conductivity of composites by tailoring filler interface. Core@double-shell structured aluminum particles are synthesized, with the metallic aluminum core encapsulated by a double-shell of amorphous and crystalline aluminum oxide. The double-shell filler structure enables a substantial increase in dielectric constant and reduction in dielectric loss for the corresponding composites, surpassing the performance of the unfilled polymer and the polymer composites containing the single-shell fillers. The improved dielectric properties can be attributed to the enhanced interfacial polarization. Furthermore, the thermal conductivity of the composites is also significantly improved when the low-k amorphous aluminum oxide shell is transformed into its crystalline phase with high thermal conductivity.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2019.107686