Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2022
Thesis Language: Turkish
Student: Merve Özdemir
Supervisor: Nursel Dilsiz
Abstract:
Aim of this study is to distribute graphene nanoplate (GNP), carbon nanoribbon (CNR) and carbon nanofiber (CNF) nanomaterials homogeneously into an aerospace graded epoxy resin using a three roll mill device and thus, to improve thermal and mechanical properties of the obtained nanocomposite material. First of all, GNP, CNR and CNF were added to the epoxy resin separately. Then, by adding the hardener, mixtures poured into metal molds were degassed and cured at 120 °C for 4 h. Mechanical properties of the nanocomposites were investigated by three-point bending. As a result of the experiment, the highest increase was observed in 0.5 wt% GNP and 0.2 wt% CNF samples, and an increase of approximately 30 wt% was achieved in the flexural strength compared to the neat resin. Complementary to this outcome and as a result of scanning electron microscopy (SEM) performed on the fracture regions after the three-point bending test, it was observed that agglomerations were formed in the CNR added samples. Thus, they did not mix sufficiently with the resin. Differential scanning calorimetry (DSC) analysis results revealed that the nanomaterial additive reduced the glass transition temperature of the resin. When the results of the thermogravimetric analysis (TGA) are examined, the highest increase (19,6%) in the decomposition temperature was observed for GNP added samples.
Key Words : Graphene, carbon nanoribbon, carbon nanofiber, epoxy nanocomposites, three-roll milling, thermal and mechanical properties