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

Abstract:
In this work, dielectric properties of composites based on bisphenol-A-epoxy resin loaded with 5 wt.% of graphite flakes or exfoliated expanded graphite have been studied. The frequency and temperature dependence of the dielectric permittivity (r) and dielectric loss (tan) have been examined in temperature (170 – 370 K) and frequency (20 Hz – 8MHz) range. Influence of the filler surface chemistry and geometry have been studied for composites loaded with 5 wt.% graphite flakes obtained: (i) under wet milling, without or with adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH. The surface treatment with KOH notable increased dielectric constant of the epoxy/GF-KOH composite. The surface treatment with Triton-100x significantly increased dielectric loss of the composite in a way that became comparable to the dielectric losses of the one loaded with exfoliated expanded graphite.

Key words:
Dielectric properties,Composites,Graphite nanosheets,Funcionalized surfaces

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

Date of abstract submission:
19.07.2023.

Conference:
Contemporary Materials 2023 - Savremeni materijali

Abstract