scholarly journals Preparation, Characterization, and Terahertz Spectroscopy Characteristics of Reduced Graphene Oxide-Doped Epoxy Resin Coating

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1503
Author(s):  
Mian Zhong ◽  
Xin Dai ◽  
Hongxing Xiang ◽  
Bingwei Liu ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Raman Spectrum ◽  
Epoxy Resin ◽  
Reduced Graphene Oxide ◽  
Composite Coating ◽  
Diffraction Peak ◽  
Oxide Content ◽  
Resin Coating ◽  
Reduced Graphene ◽  
Epoxy Resin Coating

Reduced graphene oxide has attracted numerous interests due to its unique, superior electronic, optical, mechanical, and chemical properties. An epoxy resin with excellent mechanical and electrical properties can be obtained by doping with reduced graphene oxide to enhance the function of the polymer. Here, we prepared a uniform reduced graphene oxide/epoxy resin coating with a different reduced graphene oxide content and characterized it using a field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), Raman, and Fourier transform infrared spectrometer (FTIR). Furthermore, the spectral characteristics of the composite coating in the terahertz band were discussed. The cross-sectional SEM results show that a fold structure with ductile failure was intensively formed due to the compatibility of graphene and polymer materials. Both the Raman G and Raman 2D peaks of reduced graphene oxide were confirmed using Raman spectrum testing. The diffraction peak of reduced graphene oxide at 24° disappeared within the reduced graphene oxide/epoxy resin coating, and a wide diffraction peak of the amorphous structure was formed together. Additionally, the intensity of the Raman spectrum increased significantly with increased reduced graphene oxide content, thereby making the surface electrical resistance of the coatings decrease exponentially. Additionally, the intensity of the terahertz time-domain signal and frequency-domain power spectrum linearly reduced with increased reduced graphene oxide concentration. However, the terahertz absorption coefficient and refractive index both increased gradually with increased reduced graphene oxide doping due to increased orientation polarization in the composite coating.

scholarly journals Preparation and Corrosion Resistance of ETEO Modified Graphene Oxide/Epoxy Resin Coating

Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 46 ◽  
Author(s):  
Chunling Zhang ◽  
Xueyan Dai ◽  
Yingnan Wang ◽  
Guoen Sun ◽  
Peihong Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Graphene Oxide ◽  
Epoxy Resin ◽  
Composite Coating ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
X Ray ◽  
Resin Coating ◽  
Epoxy Resin Coating

Improving the corrosion resistance of epoxy resin coatings has become the focus of current research. This study focuses on synthesizing a functionalized silane coupling agent (2-(3,4-epoxycyclohexyl)ethyl triethoxysilane) to modify the surface of graphene oxide to address nanomaterial agglomeration and enhance the coating resistance of the epoxy resin coating to corrosion by filling the coating with functionalized graphene oxide. Functionalized graphene oxide and coatings filled with functionalized graphene oxide were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The corrosion performance of each coating was studied by electrochemical impedance spectroscopy and a salt spray test. Results showed that the incorporation of functionalized graphene oxide enhances the corrosion protection performance of the epoxy composite coating, and the composite coating exhibited the best anticorrosion performance when the amount of functionalized graphene oxide was 0.7 wt %.

scholarly journals Experimental investigations on graphene oxide/rubber composite thermal conductivity

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Joanna Wilk ◽  
Robert Smusz ◽  
Ryszard Filip ◽  
Grzegorz Chmiel ◽  
Tomasz Bednarczyk
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Matrix Material ◽  
Oxide Content ◽  
Rubber Composites ◽  
Plate Method ◽  
Basic Matrix ◽  
Reduced Graphene

Abstract Graphene oxide/rubber composites were experimentally investigated for obtaining their thermal properties. Three kinds of the composite matrix material have been used: NBR, HNBR and FKM. The reduced graphene oxide in the form of crumped flakes has been applied as the filler influencing on thermal conductivity of the composites. Two values of graphene oxide weight concentration have been taken into account in the investigation. Thermal conductivity of the composites and basic matrix has been measured by the professional apparatus with the use of the guarded heat plate method. Before measurements the preliminary tests using the simplified comparative method have been performed. The results obtained, both from preliminary tests and using the guarded heat plate method, show an increase in thermal conductivity with increasing the reduced graphene oxide content in the composite. The experimental investigation allowed to determine not only the increase in thermal properties of graphene oxide/rubber composites compared to the basic matrix, but also the absolute values of thermal conductivities. Additionally, the SEM analysis showed that the tested composite samples contain agglomerates of the rGO nanoparticles. The occurrence of agglomerates could affect the composite thermal properties. This was noticed in the comparatively measurements of the temperature of different composites during the heating of samples tested. The maximum enhancement of thermal conductivity obtained was about 11% compared to the basis matrix of the composites tested.

Critical Behavior of Electrical Conductivity for Reduced Graphene Oxide/Epoxy Resin Composites

2020 ◽  
Vol 13 (3) ◽  
pp. 181-190
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Epoxy Resin ◽  
Temperature Coefficient ◽  
Reduced Graphene Oxide ◽  
Critical Behavior ◽  
Resin Matrix ◽  
Positive Temperature ◽  
Dc Electrical Conductivity ◽  
Reduced Graphene

Abstract: In this paper, we analyze the dc and ac electrical conductivities, in the 240 to 400 K temperature range and 102 to 106 Hz frequency range, of a percolating system synthesized by mixing reduced graphene oxide (rGO) particles in insulating epoxy resin matrix, diglycidyl ether of bisphenol A (DGEBA). We found that the dc electrical conductivity of the samples is strongly related to the rGO content, indicating a percolating behavior with percolation threshold ≈ 4 %. The critical behavior of the dc electrical conductivity as a function of the temperature indicates a strong positive temperature coefficient and a negative temperature coefficient of resistivity below and above the transition temperature Tg, respectively. Moreover, the results showed that the dc conductivity obeys the Arrhenius law and the ac electrical conductivity is both frequency and temperature dependent and follows the Jonscher’s power law. Keywords: Composites, Dielectric properties, Fillers, Glass transition, Graphene.

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