Surface modification and thermal performance of a graphene oxide/novolac epoxy composite

Li, Shasha; Xi, Lei; Fang, Changqing; Liu, Nailiang; Liu, Donghong

doi:10.1039/c8ra02847h

Cited by 38 publications

(14 citation statements)

References 61 publications

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“…The above findings conclude that epoxy having 5 wt% Ta 2 O 5 and 30 wt% Bi 2 O 3 filler loadings showed improved thermal stability and mechanical properties when compared to the neat epoxy. [45][46][47] Experimental densities of the composites were in close agreement with the theoretical densities (Table 4). The % heaviness of the composites was normalized to lead ( Figure 10).…”

Section: γ-Ray Attenuation Parameterssupporting

confidence: 79%

Attenuation properties of epoxy‐Ta₂O₅ and epoxy‐Ta₂O₅‐Bi₂O₃ composites at γ‐ray energies 59.54 and 662 keV

Muthamma

Bubbly

Gudennavar

2020

J of Applied Polymer Sci

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Epoxy resin filled with suitable high Z elements can be a potential shield for X‐rays and γ‐rays. In this work, we present the γ‐ray attenuation properties of epoxy composites filled with (0–30 wt%) Tantalum pentoxide (Ta2O5) and Ta2O5‐Bi2O3, which were prepared by open mold cast technique. X‐ray diffraction patterns showed crystalline peaks of Ta2O5 and bismuth oxide (Bi2O3) in the prepared epoxy‐Ta2O5 and epoxy‐Ta2O5‐Bi2O3 composites. Homogeneity of the samples at higher filler wt% was revealed by SEM images. Mechanical characterization showed the enhanced mechanical strength of epoxy‐Ta2O5‐Bi2O3 composites compared to epoxy‐Ta2O5. Higher storage modulus and glass transition temperature of the epoxy‐Ta2O5‐Bi2O3 composites showed enhanced stiffness and thermal stability when compared to neat and epoxy‐Ta2O5. Decrease in the value of tan(δ) at higher content of filler loadings indicated the good adhesion between filler and matrix. Mass attenuation coefficients of epoxy‐Ta2O5 (30 wt%) composites at γ‐ray energies 59.54 and 662 keV were found to be 0.876 cm2 g–1 and 0.084 cm2 g–1, while that of epoxy‐Ta2O5‐Bi2O3 (30 wt% Bi2O3) composite were 1.271 cm2 g–1 and 0.088 cm2 g–1, respectively. The epoxy‐5% Ta2O5‐30% Bi2O3 composites with higher μ/ρ value and tensile strength may be a potential γ‐ray shield in various radiation environments.

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Section: γ-Ray Attenuation Parameterssupporting

confidence: 79%

Attenuation properties of epoxy‐Ta₂O₅ and epoxy‐Ta₂O₅‐Bi₂O₃ composites at γ‐ray energies 59.54 and 662 keV

Muthamma

Bubbly

Gudennavar

2020

J of Applied Polymer Sci

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“…The curves in Figure 8(b) show a single sharp peak signifying a single phase transition proving that the matrix was fully cured and that the addition of g‐C 3 N 4 did not interfere with the curing process 44 . The height of the peaks presented in the figure does not directly correlate with the wt% of g‐C3N4.…”

Section: Resultsmentioning

confidence: 95%

The mechanical and thermal properties of graphitic carbon nitride (g‐C₃N₄)‐based epoxy composites

Baghdadi

Sinno

Bouhadir

et al. 2021

J of Applied Polymer Sci

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Numerous ways to reinforce epoxy resin and improve its thermomechanical properties have been attempted using organic and inorganic nanoparticles. In this paper, graphitic carbon nitride (g‐C3N4) nanoparticles were synthesized and used to improve the mechanical properties and thermal stability of epoxy composites. The g‐C3N4 was synthesized from cheap melamine powder using a simple one‐step thermal treatment, then was used to reinforce the resin at different weight percentages (wt%). X‐ray diffraction, scanning electron microscopy (SEM), and Fourier infrared spectroscopy were used to characterize the g‐C3N4 and ensure its successful synthesis by studying the changes in its crystal structure, morphology, and chemical structure. The filler was dispersed in the resin using a combination of ultrasonication and high shear mixing. The results showed that the mechanical properties were optimum when 0.5 wt% g‐C3N4 was used. The tensile strength and fracture toughness of the resulting epoxy composite improved by 21.8% and 77.3%, respectively. SEM was used to investigate the morphologies of cracks formed in epoxy composite specimens after the tensile testing. The SEM micrographs of the fracture surface showed a transition from a brittle to a rough morphology, signifying the enhancement in the composites' toughness. Thermogravimetric analysis showed a good improvement in degradation temperature of up to 8.86% while dynamic mechanical analysis showed that the incorporation of g‐C3N4 did not affect the material's glass transition temperature.

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“…The thermal conductivity of epoxy/GO nanocomposites can be determined through the Russell model using Equation (10), which is given by [ 38 ]

where

, and

are the thermal conductivity of composites, pristine epoxy, and GO filler, respectively.

= 0.258 W/mK is measured in this study through the experiments.…”

Section: Theoretical Modelingmentioning

confidence: 99%

“…Despite the availability of several experimental studies related to epoxy/GO nanocomposites, a limited number of studies are available for modeling the multifunctional properties such as the static and dynamic mechanical properties and thermal conductivity of epoxy/GO nanocomposites. Some researchers have attempted modeling the mechanical properties [ 36 , 37 ] and thermal conductivity of epoxy/GO nanocomposites [ 38 , 39 ] containing relatively high weight percentages of GO fillers. High weight percentages of GO fillers cause resin embrittlement, which lead to decrease in the mechanical properties and especially a decrease in the pseudo-ductility [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization and Modeling Multifunctional Properties of Epoxy/Graphene Oxide Nanocomposites

2021

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Thermomechanical modeling of epoxy/graphene oxide under quasi-static and dynamic loading requires thermo-mechanical properties such as Young’s modulus, Poisson’s ratio, thermal conductivity, and frequency-temperature dependent viscoelastic properties. In this study, the effects of different graphene oxide (GO) concentrations (0.05, 0.1, and 0.2 wt%) within an epoxy matrix on several mechanical and thermal properties were investigated. The distribution of GO fillers in the epoxy was investigated using transmission electron microscopy (TEM). The digital image correlation (DIC) technique was employed during the tensile testing to determine Young’s modulus and Poisson’s ratio. Analytical models were used to predict Young’s modulus and thermal conductivity, with an error of less than 13% and 9%, respectively. Frequency–temperature dependent phenomenological models were proposed to predict the storage moduli and loss tangent, with a reasonable agreement with experimental data. A relatively high storage modulus, heat-resistance index (THRI), and thermal conductivity were observed in 0.2 wt% nanocomposite samples compared with pure epoxy and other lower concentration GO nanocomposites. A high THRI and derivative of thermogravimetric analysis peak temperatures (Tm1 and Tm2) were exhibited by adding nano-fillers in the epoxy, which confirms higher thermal stability of nanocomposites than that of pristine epoxy.

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Surface modification and thermal performance of a graphene oxide/novolac epoxy composite

Cited by 38 publications

References 61 publications

Attenuation properties of epoxy‐Ta₂O₅ and epoxy‐Ta₂O₅‐Bi₂O₃ composites at γ‐ray energies 59.54 and 662 keV

Attenuation properties of epoxy‐Ta₂O₅ and epoxy‐Ta₂O₅‐Bi₂O₃ composites at γ‐ray energies 59.54 and 662 keV

The mechanical and thermal properties of graphitic carbon nitride (g‐C₃N₄)‐based epoxy composites

Experimental Characterization and Modeling Multifunctional Properties of Epoxy/Graphene Oxide Nanocomposites

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Surface modification and thermal performance of a graphene oxide/novolac epoxy composite

Cited by 38 publications

References 61 publications

Attenuation properties of epoxy‐Ta2O5 and epoxy‐Ta2O5‐Bi2O3 composites at γ‐ray energies 59.54 and 662 keV

Attenuation properties of epoxy‐Ta2O5 and epoxy‐Ta2O5‐Bi2O3 composites at γ‐ray energies 59.54 and 662 keV

The mechanical and thermal properties of graphitic carbon nitride (g‐C3N4)‐based epoxy composites

Experimental Characterization and Modeling Multifunctional Properties of Epoxy/Graphene Oxide Nanocomposites

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Product

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Attenuation properties of epoxy‐Ta₂O₅ and epoxy‐Ta₂O₅‐Bi₂O₃ composites at γ‐ray energies 59.54 and 662 keV

Attenuation properties of epoxy‐Ta₂O₅ and epoxy‐Ta₂O₅‐Bi₂O₃ composites at γ‐ray energies 59.54 and 662 keV

The mechanical and thermal properties of graphitic carbon nitride (g‐C₃N₄)‐based epoxy composites