Effect of core-shell particles on the dielectric properties of epoxy nanocomposites
- Resource Type
- Conference
- Authors
- Chaudhary, Sunny; Andritsch, Thomas; Vaughan, Alun S.
- Source
- 2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Electrical Insulation and Dielectric Phenomena (CEIDP), 2019 IEEE Conference on. :729-732 Oct, 2019
- Subject
- Engineered Materials, Dielectrics and Plasmas
Nuclear Engineering
Nanoparticles
Polymers
Permittivity
Dielectrics
Nanocomposites
Loading
Energy states
core-shell nanoparticle
particle interphase
permittivity
glass transition
epoxy nanocomposite
- Language
- ISSN
- 2576-2397
The dielectric properties of epoxy-based nanocomposites containing core-shell nanoparticles in this case TiO 2 /SiO 2 and Al 2 O 3 /SiO 2 are investigated to examine the effect of the interphase layer. Core-shell nanoparticle were synthesised and epoxy nanocomposites were prepared for characterisation by dielectric spectroscopy (0.1 Hz – 1 MHz) and the glass transition temperature measured. The results were analysed demonstrating dielectric properties which appear counter to some generally assumed hypotheses. For example: Unlike non-core-shell nanoparticles in case of Al2O3/SiO2 core-shell nanoparticles for 1 wt. % a significant drop in the real permittivity is reported. This is attributed to the hypothesised changes in the particle interphase layer. It is also reported that as the filler concentration increased the glass transition temperature reduces. As the glass transition temperature is mainly dependent on the polymer matrix it is postulated that this could be a result of interference of the core-shell nanoparticle with the mobility dynamics and changes in the free volume. The effect of interactions between the core and shell of the nanoparticle and changes in the concentration of localised energy states are also discussed in the paper.