Abstract

The present work has been focused on the development of nanocomposites based on epoxy vinyl ester (EVE) matrix and some kinds of polymeric graphitic carbon nitride (g-C3N4) as a reinforcing agent. At first, the obtained solids were characterized by X-ray diffraction analyzer (XRD) and scanning electron microscope (SEM). Then, water absorption properties and mechanical properties for nanocomposites consist of g-C3N4 nanosheets were investigated. The results showed that the most appropriate amount of nanofiller (NF) (i.e., g-C3N4 nanosheets (CN-500)) is 0.5%wt. Then, the comparison between neat EVE and nanocomposites consist of CN-500 (0.5%wt) was studied by Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA), and the results showed that the thermal properties had been improved. The effects of embedment (dope process) with atoms like sulfur, chlorine, phosphorus, Fe3+ ion and couple with Fe3O4 was investigated by the vector network analyzer. Data analysis indicated that among the prepared nanocomposites with 0.5%wt of NFs, the phosphorus-doped g-C3N4 (PCN) sample (with 2 mm thickness) reflection loss (RL) spectrum is less than -10 dB (absorption >90%) at the frequency range of 8–12 GHz (X-band). Also, the area under the RL curve for the best nanocomposite sample was calculated 67.42 GHz.dB, and it was suggested that PCN could be a good candidate for microwave (MW) absorption purposes. Also, this sample has shown interesting results in the tensile strength test which makes it an appropriate choice for using it as rigid coating with MW absorption ability.