Preparation of graphene oxide-based polyaniline composites with synergistic anticorrosion effect for waterborne polyurethane anticorrosive coatings

Gao, Feng; Luo, Yaofa; Xu, Junhuai; Du, Xiaosheng; Wang, Haibo; Cheng, Xu; Du, Zongliang

doi:10.1016/j.porgcoat.2021.106233

Cited by 36 publications

(17 citation statements)

References 46 publications

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“…The transmittance values do not deviate much over the wavelength range studied, indicative of good coating quality. The phenomena responsible for the blocking of UV are as follows: (i) the ability of GNP to absorb and reflect UV radiations, − (ii) delocalization of π bonds in CNF causing UV absorption, , (iii) π–π* and polaron to π* transitions in PAni, ,− and (iv) π–π* and polaron band transitions in PPy. , These phenomena are thus synergistically responsible for blocking UV radiation in coated fabrics.…”

Section: Resultsmentioning

confidence: 99%

Water-Borne Carbonaceous Coatings on Conducting Polymer-Modified Cotton Fabrics To Attenuate Electromagnetic Radiation

Jagadeshvaran

Bose

2023

ACS Appl. Eng. Mater.

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Textile-based shielding materials are gaining much importance for electromagnetic interference (EMI) shielding because of their increased flexibility compared to most existing materials. The multilayer-like architectures realized by coating textiles can be used strategically to enhance the attenuation of microwaves. Herein, we report a water-borne conductive coating capable of shielding both EM and UV radiation with good thermal stability for potential applications as smart textiles. This work tries to understand the effect of different textile pre-treatments to maximize the enhancements in properties. Cotton fabrics were initially subjected to in situ polymerization of aniline and pyrrole and subsequently coated with a carbonaceous layer containing graphene nanoplatelets and carbon nanofibers on both the sides. It was seen that both the conducting polymer layer and the carbonaceous coating work in tandem to enhance the thermal stability, UV blocking, and EMI shielding. The coated fabrics shows a shielding effectiveness of −22 dB at a thickness of 1.2 mm over a wide frequency range of 2.6−26.5 GHz, a limiting oxygen index of 26%, and remarkable UV-blocking properties with a blocking of 99.99%. Both the coating and the pre-treatment do not alter the fabric's wettability�the surface remains hydrophilic. The coating rendered the fabric with conductivity values showing a four-order jump from the control sample. The samples show a shielding effectiveness of −22 dB, accounting for more than 99% of the incident radiation being attenuated. The attenuation happens via an absorption-dominated mechanism. The coated textile exhibits excellent heat dissipation properties, with temperatures dropping from as high as 147 to 41 °C in just 60 s.

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Section: Resultsmentioning

confidence: 99%

Water-Borne Carbonaceous Coatings on Conducting Polymer-Modified Cotton Fabrics To Attenuate Electromagnetic Radiation

Jagadeshvaran

Bose

2023

ACS Appl. Eng. Mater.

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“…In addition, only Fe and Fe 2 O 3 were detected at the 1.5 wt % Ti 3 C 2 –PA–MMT/PC composite, demonstrating that an appropriate content and good distribution of modified nanosheets can block the corrosive medium, notably enhance the corrosion performance, and prolong the protection time of the coating. , As shown in Raman spectra (Figure b), the corrosion layer beneath neat PC showed peaks of α-Fe 2 (OH) 3 Cl (3545 cm –1 ), Fe 3 O 4 (540 cm –1 ), FeOOH (250, 720, 1060, and 1300 cm –1 ), and FeCl 3 (220 cm –1 ). In the case of modified coatings, only the peaks originating from Fe 2 O 3 (1430 cm –1 ) and Fe 3 O 4 were detected normalO 2 + 2 normalH 2 normalO + 4 normale − → 4 normalO normalH − normalF normale → normalF normale 2 + + 2 normale − normalF normale 2 + → normalF normale 3 + + normale − normalF normale 2 + + 2 normalO normalH − → normalF normale normalO normalO normalH + normalH + + normale − 2 normalF normale 2 + + normalH 2…”

Section: Resultsmentioning

confidence: 99%

“…In the case of modified coatings, only the peaks originating from Fe 2 O 3 (1430 cm −1 ) and Fe 3 O 4 were detected. 74…”

Section: Corrosion Morphologymentioning

confidence: 99%

Ti₃C₂ MXene/Polyaniline/Montmorillonite Nanostructures toward Solvent-Free Powder Coatings with Enhanced Corrosion Resistance and Mechanical Properties

Nazarlou

Hosseini

Dorraji

et al. 2023

ACS Appl. Nano Mater.

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Solvent-free powder coatings have become very popular in the coating industry in replacing conventional liquid coatings for the last decades. However, poor adhesion of powder coatings to the substrate and micropores inevitably created during the curing process of coatings lead to localized corrosion and reduced mechanical resistance. For this purpose, Ti 3 C 2 MXene/ polyaniline (PANI)/montmorillonite (MMT) nanocomposites with superior conductivity and adhesion capabilities were incorporated into the eco-friendly powder coating. The as-synthesized nanocomposites were analyzed using various techniques such as Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, field-emission scanning electron microscopy, and Raman spectroscopy. To evaluate the effectiveness of the powder coating in preventing corrosion on a mild steel substrate, two methods were employed: potentiodynamic polarization and electrochemical impedance spectroscopy. The electrochemical tests revealed that an excellent dispersion of 1.5 wt % Ti 3 C 2 MXene/ PANI/MMT nanosheets in a polyester/epoxy powder coating resulted in superior anti-corrosion performance (4.8 × 10 6 Ω) after 42 days of immersion in 3.5 wt % NaCl as compared to blank samples (7.2 × 10 2 Ω). According to Tafel analysis, the corrosion potential of the optimal sample is −0.062 V, which is more positive than that of the pristine powder coating (−0.83 V). The polarization resistance (R p ) and corrosion current (i corr ) of the optimal sample are determined to be 3.39 × 10 6 Ω•cm 2 and 7.69 × 10 −9 A•cm −2 , respectively. Moreover, the optimal sample marginally increased the hardness (229.42 MPa) compared to the pure sample (152.68 MPa) due to the synergistic effect of Ti 3 C 2 MXene and flake-like MMT nanoparticles, which results in an improvement in the mechanical strength of powder coatings. Additionally, the presence of PANI caused further crosslinking and modulation of the electrical conductivity of the produced nanocomposites. The present study proposes a practical method to enhance the mechanical and shielding properties of solvent-free powder coatings, making them suitable for use in various real-world applications, including commercial, medical, and household sectors.

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“…This is possibly an indication that the polymer enables the transfer of ionic charge towards the metallic surface. The impedance modules, which start at high values (ffi10 10 ) characteristic of protective coatings, [49][50][51] decay to values on the order of 10 5 , which suggests less protection on the metal. On the other hand, the graph in Figure 10 of the PA12/MMT-Metal system evidence that in almost all frequency ranges, the system presents a capacitive behavior, therefore, the decay of the impedance modules in low frequencies is minor, and the values kept up to 10 9 .…”

Section: Electrochemical Testsmentioning

confidence: 99%

Barrier behavior evaluation of polyamide 12 nanoclay composite to offshore application by electrochemical impedance spectroscopy

Valério

Santos

Carvalho

et al. 2021

J of Applied Polymer Sci

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Commercially, polyamide 12 (PA12) is one of the polymers applied as an internal insulation layer in offshore exploitation. The present study aims to produce a hybrid system based on PA12 with 5 wt% of a nanoclay grade (montmorillonite -MMT) and evaluate its effect on the barrier behavior of the PA12 matrix, the exact grade used in the pressure layer of flexible pipe, over carbon steel AISI 1020, metallic alloy responsible for providing the mechanical properties to flexible pipes. The barrier behavior, related to ion and molecule diffusion in synthetic production water, was assessed by Electrochemical Impedance Spectroscopy (EIS) and linear sweep voltammetry (LSV) analysis, which allow for interpreting the carbon steel corrosion mechanisms. One also carried out Fourier transform infrared, X-ray diffraction, and Scanning electron microscopy analyzes. The data showed that the MMT lamellae are well-dispersed in the PA12 matrix. EIS and LSV analysis results showed higher corrosion protection efficiency by the system composed of PA12/MMT once compared to the system without adding the load.

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Preparation of graphene oxide-based polyaniline composites with synergistic anticorrosion effect for waterborne polyurethane anticorrosive coatings

Cited by 36 publications

References 46 publications

Water-Borne Carbonaceous Coatings on Conducting Polymer-Modified Cotton Fabrics To Attenuate Electromagnetic Radiation

Water-Borne Carbonaceous Coatings on Conducting Polymer-Modified Cotton Fabrics To Attenuate Electromagnetic Radiation

Ti₃C₂ MXene/Polyaniline/Montmorillonite Nanostructures toward Solvent-Free Powder Coatings with Enhanced Corrosion Resistance and Mechanical Properties

Barrier behavior evaluation of polyamide 12 nanoclay composite to offshore application by electrochemical impedance spectroscopy

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Preparation of graphene oxide-based polyaniline composites with synergistic anticorrosion effect for waterborne polyurethane anticorrosive coatings

Cited by 36 publications

References 46 publications

Water-Borne Carbonaceous Coatings on Conducting Polymer-Modified Cotton Fabrics To Attenuate Electromagnetic Radiation

Water-Borne Carbonaceous Coatings on Conducting Polymer-Modified Cotton Fabrics To Attenuate Electromagnetic Radiation

Ti3C2 MXene/Polyaniline/Montmorillonite Nanostructures toward Solvent-Free Powder Coatings with Enhanced Corrosion Resistance and Mechanical Properties

Barrier behavior evaluation of polyamide 12 nanoclay composite to offshore application by electrochemical impedance spectroscopy

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Ti₃C₂ MXene/Polyaniline/Montmorillonite Nanostructures toward Solvent-Free Powder Coatings with Enhanced Corrosion Resistance and Mechanical Properties