Author(s):
1. Slavica Maletić, Univerzitet u Beogradu, Fizički fakultet, Studentski trg 12, Beograd, Serbia
2. Ivan Petronijević, Univerzitet u Beogradu, Fizički fakultet, Studentski trg 12, Beograd, Serbia
3. Dragana Cerović, University of Belgrade, Faculty of Physics, Serbia
4. Mirjana Milić, VINČA Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Department of Th, Serbia
5. Nataša Jović Orsini, VINČA Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Department of Th, Serbia

Abstract:
In this study, dielectric properties of composites, based on epoxy resin (bisphenol-A-epoxy), with different weight percentage of exfoliated graphite (EG) of 1wt%, 3wt% and 5wt%, were investigated. Exfoliated graphite differs from other allotropic carbon modifications due to its cellular structure and the ability to bond three-dimensionally, through mechanical bonding. Dielectric measurements were carried out in a wide temperature interval (170-350 K) at test frequency of 3 kHz. Imaginary part of dielectric permittivity, “, was analyzed as a function of temperature and load content of filler EG. The relaxation peak, which is characteristics for epoxy, changes intensity and position with increasing weight percentage of EG. The significant changes in relaxation intensity and position observed in the composite with 5 wt% EG indicates the onset of a dielectric-semiconductor phase transition.

Key words:
dielectric permittivity, epoxy, exfoliated graphene, nanocomposites,dielectric loss, epoxy, exfoliated graphite, nanocomposites,

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
30.06.2025.

Conference:
Contemporary Materials 2025 - Savremeni Materijali