Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2022
Thesis Language: Turkish
Student: Mahide Betül ÖZTÜRKMEN
Principal Supervisor (For Co-Supervisor Theses): Nursel Dilsiz
Co-Supervisor: Yahya Öz
Abstract:
In this master's thesis, it is aimed to make the epoxy resin thermally and electrically conductive by reinforcement the hybrid mixture obtained by using graphene and hexagonal boron nitride, a nanomaterial with graphene-like properties, which has been the subject of research in the academic world recently. Nanomaterials to be used in production were subjected to XRD analysis in order to examine their crystal structures. In addition, experiments were planned using an experimental design method before starting the experimental studies. Within the scope of this study, nanomaterials at reinforcement ratios of 0.1%, 0.25%, 0.5% and 1% by weight were mixed into epoxy resin using a three-roll mill and then they were cured. SEM, FTIR, TGA, DSC, thermal conductivity, electrical conductivity and three point bending tests of the produced GNP/epoxy, h-BN/epoxy and GNP/h-BN/epoxy nanocomposites were performed. As a result of the analysis, it was observed that the thermal conductivity increased by 9.3% in the hybrid nanocomposite reinforced with 1% GNP and 1% h-BN by weight. At the same time, when the electrical properties were examined, the percolation threshold was reached at low reinforcement ratios (0.1% and 0.25%). It was observed that there was a significant increase in electrical conductivity values with the increase of GNP addition, this value was determined as approximately 103 S/m. However, the effect of percentage of reinforcement on flexural strength is also of great importance, with a 58% increase in 0.1% h-BN/epoxy nanocomposite compared to pure epoxy. It has been concluded that both pure and hybrid nanocomposites produced within the scope of this study can be used in harsh environments and for various aerospace applications such as electrostatic dissipation, electrostatic painting, electromagnetic shielding, insulation materials, structural parts, etc., with their improved properties.
Key Words : Graphene, h-Boron Nitride, thermoset resin, hybrid nanocomposite, thermal conductivity, electrical conductivity, mechanical test