Covalently-grafted graphene oxide nanosheets to improve barrier and corrosion protection properties of polyurethane coatings

Ramezanzadeh, Bahram; Ghasemi, Ebrahim; Mahdavian, M.; Changizi, E.; Moghadam, M.H. Mohamadzadeh

doi:10.1016/j.carbon.2015.05.094

Cited by 346 publications

(115 citation statements)

References 37 publications

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“…[11][12][13][14][15] These composite materials face the challenge of being able to resist simultaneously severe situations such as high temperatures, abrasive conditions and corrosive environments.…”

Section: Introductionmentioning

confidence: 99%

“…An additional protection mechanism might be related to the increase of the ionic resistance of the coatings by the presence of carbon nanostructures. 14,15 In this case, the negatively charged GO and CNTs act as repulsive agents for the chloride anions, resulting in an improved barrier property of the coating. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 26 capacitance values, the equivalent circuit, displayed in Figure 10, was used to fit the EIS data.…”

mentioning

confidence: 99%

“…Nyquist and Bode plots of unloaded and CNT and GO loaded (a) BPO0.01 and (b) BPO0.05 matrix compared to bare carbon steel, after one day of immersion in 3.5 % NaCl solution.The capacitance of the coating is indicative for the diffusion behavior of the electrolyte 15. Low permeability towards corrosive electrolytes results in low capacitance values.…”

mentioning

confidence: 99%

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A Comparative Study on Graphene Oxide and Carbon Nanotube Reinforcement of PMMA-Siloxane-Silica Anticorrosive Coatings

Harb

Pulcinelli

Santilli

et al. 2016

ACS Appl. Mater. Interfaces

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Carbon nanotubes (CNTs) and graphene oxide (GO) have been used to reinforce PMMA-siloxane-silica nanocomposites considered to be promising candidates for environmentally compliant anticorrosive coatings. The organic-inorganic hybrids were prepared by benzoyl peroxide (BPO)-induced polymerization of methyl methacrylate (MMA) covalently bonded through 3-(trimethoxysilyl)propyl methacrylate (MPTS) to silica domains formed by hydrolytic condensation of tetraethoxysilane (TEOS). Single-walled carbon nanotubes and graphene oxide nanosheets were dispersed by surfactant addition and in a water/ethanol solution, respectively. These were added to PMMA-siloxane-silica hybrids at a carbon (CNT or GO) to silicon (TEOS and MPTS) molar ratio of 0.05% in two different matrices, both prepared at BPO/MMA molar ratios of 0.01 and 0.05. Atomic force microscopy and scanning electron microscopy showed very smooth, homogeneous, and defect-free surfaces of approximately 3-7 μm thick coatings deposited onto A1020 carbon steel by dip coating. Mechanical testing and thermogravimetric analysis confirmed that both additives CNT and GO improved the scratch resistance, adhesion, wear resistance, and thermal stability of PMMA-siloxane-silica coatings. Results of electrochemical impedance spectroscopy in 3.5% NaCl solution, discussed in terms of equivalent circuits, showed that the reinforced hybrid coatings act as a very efficient anticorrosive barrier with an impedance modulus up to 1 GΩ cm(2), approximately 5 orders of magnitude higher than that of bare carbon steel. In the case of GO addition, the high corrosion resistance was maintained for more than 6 months in saline medium. These results suggest that both carbon nanostructures can be used as structural reinforcement agents, improving the thermal and mechanical resistance of high performance anticorrosive PMMA-siloxane-silica coatings and thus extending their application range to abrasive environments.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A Comparative Study on Graphene Oxide and Carbon Nanotube Reinforcement of PMMA-Siloxane-Silica Anticorrosive Coatings

Harb

Pulcinelli

Santilli

et al. 2016

ACS Appl. Mater. Interfaces

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“…The anti-corrosion properties of the coatings were improved because the electrolyte required a longer time to penetrate through the coating and reached the metal/coating interface along the tortuous path. Another possible mechanism of improvement was the effect of ZSM-5-NH-GO nanosheets on enhancing the composite coating ionic resistance [31]. …”

Section: Electrochemical Impedance Spectroscopy Of the Coatingsmentioning

confidence: 99%

Effect of Graphene Oxide/ZSM-5 Hybrid on Corrosion Resistance of Waterborne Epoxy Coating

et al. 2018

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Abstract:In this study, the preparation of modified graphene oxide (GO) synergistic structure (ZSM-5-NH-GO) and the effect of this structure on the corrosion performance of epoxy coatings were investigated. The structural and morphological properties of ZSM-5-NH-GO were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The corrosion performances were studied by electrochemical impedance spectroscopy (EIS) and salt spray tests. The EIS results showed that the corrosion resistance of steel substrate was considerably improved by ZSM-5-NH-GO. The salt spray tests demonstrated that the ZSM-5-NH-GO coating provided strong corrosion performance for steel substrate. The mechanical properties of the epoxy-composite coatings containing ZSM-5-NH-GO were studied by adhesion tests. The above results indicated that the composite coating containing 0.7 wt % ZSM-5-NH-GO composite possessed most excellent anti-corrosion performance compared with other epoxy coatings.

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“…The introduction of nanoparticles has always been considered to increase the crosslinking density and make the coating more dense. Among those nanoparticles, CNT fillers can improved the mechanical properties of the coatings owing to its high strength and modulus of elasticity [1]; GO was considered to have the anticorrosive properties owing to its impermeability to oxygen and water, its very high surface area, nanometric thickness and plate-like structure [2]. However, both CNTs and GO have the agglomeration problem which would influence the compatibility between the coating matrix and fillers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of functionalized CNTs/hyperbranched polyester nanocomposites

Pan

Cui

Zhang

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Carbon nanotubes (CNTs) were unzipped using the modified Hummer method to prepare the CNTs-GO microstructure (see Fig. 1). A new type of CNTs-GO-H20 nanocomposite has been synthesized by grafting hyperbranched (HB) polyester (Boltorn H20) brushes on the CNTs-GO by coupling agent (KH560). The morphology of CNTs-GO-H20 was characterized by FTIR, TEM, XPS and TGA. The FT-IR data and XPS data evidenced that CNTs-GO-H20 nanocomposites were synthesized successfully. The addition of CNTs improved the thermal stability of the nanocomposites. The TEM data showed that the CNTs-GO microstructure was also prepared. These electrochemical measurements results indicated that coatings provided greater protection against corrosion behavior. Moreover, the nanocomposite material improved corrosion resistance of the coating.

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Covalently-grafted graphene oxide nanosheets to improve barrier and corrosion protection properties of polyurethane coatings

Cited by 346 publications

References 37 publications

A Comparative Study on Graphene Oxide and Carbon Nanotube Reinforcement of PMMA-Siloxane-Silica Anticorrosive Coatings

A Comparative Study on Graphene Oxide and Carbon Nanotube Reinforcement of PMMA-Siloxane-Silica Anticorrosive Coatings

Effect of Graphene Oxide/ZSM-5 Hybrid on Corrosion Resistance of Waterborne Epoxy Coating

Synthesis of functionalized CNTs/hyperbranched polyester nanocomposites

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