Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites
Apstrakt
Dielectric properties of composites based on bisphenol-A-epoxy resin loaded with various content of graphite flakes (GF) have been studied. The dielectric permeability, tangent loss and ac conductivity have been examined in wide temperature (170 – 370 K) and frequency (20 Hz – 200 kHz) range. In composites loaded with GF flakes up to 10 wt.%, the dominant conduction mechanism is tunneling of electrons, while loading of 15 wt.% gives rise to electron conduction through direct contacts between fillers. Dielectric properties of composites are largely determined by the nature of the filler/matrix interface, the filler surface area and the inherent conductivity of the fillers. At low electric field frequencies, dominates socalled interfacial (or space charge) polarization due to accumulation of free charges at the interfaces between two phases (filler and matrix), which differ in electrical conductivity.Influence of the filler surface chemistry have been studied for composites loaded with 5... wt.% graphite flakes obtained: (i) under wet milling, without (GF) or with (GF-Tr100x) adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH (GF-KOH). The surface treatment with KOH notable increased dielectric constant of the epoxy/GF-KOH5 composite, keeping low tangent loss, comparable to the counterpart, the epoxy/GF5 composite.
Ključne reči:
dielectric properties / composites / graphite nanosheetsIzvor:
26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia, 2023, 169-169Izdavač:
- Society of Chemists and Technologists of Macedonia
Kolekcije
Institucija/grupa
VinčaTY - CONF AU - Maletić, S. AU - Cerović, D. AU - Petronijević, A. AU - Milić, Mirjana AU - Jović Orsini, Nataša PY - 2023 UR - https://vinar.vin.bg.ac.rs/handle/123456789/11761 AB - Dielectric properties of composites based on bisphenol-A-epoxy resin loaded with various content of graphite flakes (GF) have been studied. The dielectric permeability, tangent loss and ac conductivity have been examined in wide temperature (170 – 370 K) and frequency (20 Hz – 200 kHz) range. In composites loaded with GF flakes up to 10 wt.%, the dominant conduction mechanism is tunneling of electrons, while loading of 15 wt.% gives rise to electron conduction through direct contacts between fillers. Dielectric properties of composites are largely determined by the nature of the filler/matrix interface, the filler surface area and the inherent conductivity of the fillers. At low electric field frequencies, dominates socalled interfacial (or space charge) polarization due to accumulation of free charges at the interfaces between two phases (filler and matrix), which differ in electrical conductivity.Influence of the filler surface chemistry have been studied for composites loaded with 5 wt.% graphite flakes obtained: (i) under wet milling, without (GF) or with (GF-Tr100x) adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH (GF-KOH). The surface treatment with KOH notable increased dielectric constant of the epoxy/GF-KOH5 composite, keeping low tangent loss, comparable to the counterpart, the epoxy/GF5 composite. PB - Society of Chemists and Technologists of Macedonia C3 - 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia T1 - Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites SP - 169 EP - 169 UR - https://hdl.handle.net/21.15107/rcub_vinar_11761 ER -
@conference{ author = "Maletić, S. and Cerović, D. and Petronijević, A. and Milić, Mirjana and Jović Orsini, Nataša", year = "2023", abstract = "Dielectric properties of composites based on bisphenol-A-epoxy resin loaded with various content of graphite flakes (GF) have been studied. The dielectric permeability, tangent loss and ac conductivity have been examined in wide temperature (170 – 370 K) and frequency (20 Hz – 200 kHz) range. In composites loaded with GF flakes up to 10 wt.%, the dominant conduction mechanism is tunneling of electrons, while loading of 15 wt.% gives rise to electron conduction through direct contacts between fillers. Dielectric properties of composites are largely determined by the nature of the filler/matrix interface, the filler surface area and the inherent conductivity of the fillers. At low electric field frequencies, dominates socalled interfacial (or space charge) polarization due to accumulation of free charges at the interfaces between two phases (filler and matrix), which differ in electrical conductivity.Influence of the filler surface chemistry have been studied for composites loaded with 5 wt.% graphite flakes obtained: (i) under wet milling, without (GF) or with (GF-Tr100x) adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH (GF-KOH). The surface treatment with KOH notable increased dielectric constant of the epoxy/GF-KOH5 composite, keeping low tangent loss, comparable to the counterpart, the epoxy/GF5 composite.", publisher = "Society of Chemists and Technologists of Macedonia", journal = "26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia", title = "Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites", pages = "169-169", url = "https://hdl.handle.net/21.15107/rcub_vinar_11761" }
Maletić, S., Cerović, D., Petronijević, A., Milić, M.,& Jović Orsini, N.. (2023). Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia Society of Chemists and Technologists of Macedonia., 169-169. https://hdl.handle.net/21.15107/rcub_vinar_11761
Maletić S, Cerović D, Petronijević A, Milić M, Jović Orsini N. Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia. 2023;:169-169. https://hdl.handle.net/21.15107/rcub_vinar_11761 .
Maletić, S., Cerović, D., Petronijević, A., Milić, Mirjana, Jović Orsini, Nataša, "Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites" in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia (2023):169-169, https://hdl.handle.net/21.15107/rcub_vinar_11761 .