Preparation And Characterization Of Oxidized Graphene Composites

In this paper, graphite oxide was prepared by hummers method, and then was subjected to ultrasonic treatment in the organic solvents to prepare graphene oxide. Using typic polymer materials PA and PP as matrix, respectively, grapheme oxide as filler, graphene oxide/ polymer composites were prepared by physical solution blending. Graphene oxide and the composite systems were characterized by means of Fourier IR spectra (FTIR), Raman spectroscopy (Raman), Thermal gravimetric analyzer and Derivative Thermo-gravimetry (TGA/DTG), Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Polarized optical microscopy (POM). Meanwhile, Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) were used to observe the microstructure of graphene oxide and the composite systems.The analysis results of FT-IR, Raman, XRD and TEM show that graphene oxide was successfully prepared and graphene oxide was obtained after ultrasonic treatment. The size of graphene oxide has reached the nm level. Graphene oxide can disperse well in ethylene glycol, and also disperse well in formic acid followed by isocyanate treatment.For the composite systems, SEM photographs show that graphene oxide could disperse well in the matrix, POM,XRD and DSC analysis results indicate that the addition of grahene oxide has a great influence on the crystal performances of the matrix, such as crystal morphology, crystallinity, crystallization temperature, crystallization rate, but has no influence on the crystal form. All of these may because that on the one hand the addition of graphene oxide destroyes the molecular chain regularity, on the other hand it enhances the crystallization of the matrix as nucleating agent. TGA/DTG analysis result shows that the addition of graphene oxide played no obvious role in the thermal stability of the matrix. With the analysis of thermal degradation kinetics, it can be concluded that with the addition of graphene oxide, the thermal degradation activation energy of the polymer increases.