Impact of particle thermal treatment on dielectric properties of core-shell filled epoxy nano-composites

Chaudhary, S., Vryonis, O. and Andritsch, T. (2024) Impact of particle thermal treatment on dielectric properties of core-shell filled epoxy nano-composites. In 2024 IEEE 5th International Conference on Dielectrics (ICD). IEEE. 4 pp . (doi:10.1109/ICD59037.2024.10613284).

Abstract

This paper presents the effect of Silica-Titania (SiO₂@TiO₂) core-shell nano-particles added into amine-cured epoxy composites, under three different particle treatment conditions: untreated, calcined at 250 ∘C and 450 ∘C , on the dielectric and structural properties of the bulk composite. Characterization was conducted using a range of methods Transmission Electron Microscopy (TEM), Fourier Transform Infra-Red Spectroscopy (FTIR), Raman Spectroscopy, Differential Scanning Calorimetry (DSC) and Broadband Dielectric Spectroscopy (BDS). TEM confirmed the synthesis of the core-shell architecture with denser shells at higher calcination temperatures. Raman spectroscopy showed an increase in the Ti-O-Ti network formation and orderliness with elevated temperature treatment. Incorporating untreated filler into epoxy reduces the bulk real permittivity, while the inclusion of calcined fillers leads to an increase. An additional ω relaxation was observed in imaginary permittivity spectra of nano-composites pointing towards altered molecular dynamics within the epoxy due to nano-particle addition. These findings highlight the role of core-shell nano-particles in modifying the dielectric properties of epoxy composites, whilst differentiating them from conventional nano-particles.

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Contributors

Author: S. Chaudhary

Author: O. Vryonis

Author: T. Andritsch

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