Aniline pentamer-modified reduced graphene oxide/epoxy composites as anticorrosion coatings

Lan, Yun‐Xiang; Weng, Chih Wei; Ahmed, Mahmoud M.; Luo, Kun-Hao; Ji, Wei-Fu; Liu, Wei‐Ren; Yeh, Jui‐Ming

doi:10.1016/j.matchemphys.2021.124446

Cited by 20 publications

(6 citation statements)

References 61 publications

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“…From Figure 1 a, the spectra of ACAT reveals the signal at 5.42 ppm and 7.03 to 6.48 ppm corresponded to the primary amine protons (-NH 2 ) and aromatic protons [ 40 ]. The signals of ACAP shows the signal at 5.41 ppm shown in Figure 1 b could be also assigned to the primary amine protons(-NH 2 ), and the signals around 7.03 to 6.60 ppm represents the splitting of aromatic protons [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

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In Situ Redox Synthesis of Highly Stable Au/Electroactive Polyimide Composite and Its Application on 4-Nitrophenol Reduction

et al. 2023

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In this study, we developed a series of Au/electroactive polyimide (Au/EPI-5) composite for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using NaBH4 as a reducing agent at room temperature. The electroactive polyimide (EPI-5) synthesis was performed by chemical imidization of its 4,4′-(4.4′-isopropylidene-diphenoxy) bis (phthalic anhydride) (BSAA) and amino-capped aniline pentamer (ACAP). In addition, prepare different concentrations of Au ions through the in-situ redox reaction of EPI-5 to obtain Au nanoparticles (AuNPs) and anchored on the surface of EPI-5 to form series of Au/EPI-5 composite. Using SEM and HR-TEM confirm the particle size (23–113 nm) of the reduced AuNPs increases with the increase of the concentration. Based on CV studies, the redox capability of as-prepared electroactive materials was found to show an increase trend: 1Au/EPI-5 < 3Au/EPI-5 < 5Au/EPI-5. The series of Au/EPI-5 composites showed good stability and catalytic activity for the reaction of 4-NP to 4-AP. Especially, the 5Au/EPI-5 composite shows the highest catalytic activity when applied for the reduction of 4-NP to 4-AP within 17 min. The rate constant and kinetic activity energy were calculated to be 1.1 × 10−3 s−1 and 38.9 kJ/mol, respectively. Following a reusability test repeated 10 times, the 5Au/EPI-5 composite maintained a conversion rate higher than 95%. Finally, this study elaborates the mechanism of the catalytic reduction of 4-NP to 4-AP.

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Section: Resultsmentioning

confidence: 99%

“…The characteristic peak of C-N on the amine group was detected at 1274 cm −1 . Finally, the characteristic peaks were found at 834, 736, 697 cm −1 [ 41 ], which attributed to the bending of C-H group of the hydrogen atom at the benzene. These characteristic peaks of overall spectra indicated the ACAT and ACAP were successfully achieved.…”

Section: Resultsmentioning

confidence: 99%

In Situ Redox Synthesis of Highly Stable Au/Electroactive Polyimide Composite and Its Application on 4-Nitrophenol Reduction

et al. 2023

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“…AP, DFAP, and DAAP were synthesized according to the previous report. 17 The preparation of DAAP is illustrated in Scheme 1. DAAP was prepared in three steps: First, APS was reacted with a mixture of N,N′-diphenyl-p-phenylenediamine and 4,4′-diaminodiphenylamine sulfate to form AP.…”

Section: Preparation Of Ap-based Diaminementioning

confidence: 99%

“…AP, DFAP, and DAAP were synthesized according to the previous report . The preparation of DAAP is illustrated in Scheme .…”

Section: Experimental Sectionmentioning

confidence: 99%

“…15 Research activities have focused on the synthesis and distinctive applications of aniline oligomer-based polymers. Yeh et al reported that electroactive epoxy thermoset (EET) coatings with an amine-capped aniline trimer (ACAT) in the main chain 16 or AP in the side chain 17 exhibit significantly enhanced anticorrosion performance for cold-rolled steel (CRS) electrodes as compared to neat non-electroactive epoxy coatings. The EET has enhanced corrosion resistance due to the electrocatalytic ability of aniline oligomers to form a densely passivated metal oxide layer on the CRS electrode to protect the underlying metal substrate, which was consistent with the results with PANI reported by Wessling.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Effect of Electrocatalytic Characteristics of a Redox Segment and Gas Barrier of rGO to Significantly Replace the Loading of Zinc Dust in Solvent-Based Epoxy Composites Applied for Heavy-Duty Anticorrosion Coatings

Lan

Yan

et al. 2023

ACS Appl. Eng. Mater.

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Zinc-rich epoxy coating plays a major role in current heavy-duty corrosion protection solutions, yet high loading of zinc dust (ZD) weakens the coating flexibility and adhesion capability of the overall coating. This work demonstrated the successful incorporation of small amounts of rGO and aniline pentamer (AP)-based diamine into zinc-rich non-electroactive epoxy thermoset (NEET) as a novel heavy-duty anticorrosion coating composite. This coating composite promoted its wear resistance without sacrificing anticorrosion performance and adhesion ability while effectively reducing the loading of ZD. Based on a series of electrochemical measurements, an electroactive epoxy thermoset (EET) containing 5 wt % electroactive APbased diamine (DAAP) and 0.5 wt % rGO can replace 70 wt % ZD and shows equivalent anticorrosion performance under an accelerated salt-spray assay and electrochemical corrosion measurements. Furthermore, coatings containing DAAP and rGO exhibited improved wear resistance and good adhesion capability.

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Water soluble redox‐active polyurethanes as efficient corrosive inhibitors for mild steel

Prasad Paradhakshina,

Dhore,

Arukula

et al. 2024

J of Applied Polymer Sci

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There is a necessity for an eco‐friendly inhibitor technology to safeguard mild steel from corrosion. Redox‐active Oligoanilines, namely diamine‐capped trimer (DCTA) and tetramer (DCTAni) have been synthesized and incorporated into the polyurethane backbone derived from polyethylene glycols (PEG, Mw = 2050, 4000) and toluene diisocyanate (TDI). The four water‐soluble polyurethanes, resulting from PEG, TDI, and DCTA/DCTAni, were denoted as IH‐1, IH‐2, IH‐3, and IH‐4. The corresponding redox‐active polyurethanes were rationally characterized using FTIR, and UV–visible spectroscopies. Scanning electron microscopy (SEM) was employed to investigate the surface morphology. The electrochemical properties of these inhibitors were characterized by cyclic voltammetry (CV). All the inhibitors were studied for their corrosion inhibition efficiency using Tafel potentiodynamic polarization analysis and weight loss methods. These demonstrated high efficacy at a low concentration of 200–300 ppm. The absorptivity of polymers on the mild steel were confirmed by Langmuir adsorption isotherms with a well‐fitting (R2 = 99.9%). The SEM analysis showed the adsorption capacity of inhibitors as protective layers for the mild steel panels. Overall, this work paves the way for innovative ideas for producing more water‐soluble and electrochemically active polymer additives as excellent corrosive inhibitors for mild steel surfaces.

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Aniline pentamer-modified reduced graphene oxide/epoxy composites as anticorrosion coatings

Cited by 20 publications

References 61 publications

In Situ Redox Synthesis of Highly Stable Au/Electroactive Polyimide Composite and Its Application on 4-Nitrophenol Reduction

In Situ Redox Synthesis of Highly Stable Au/Electroactive Polyimide Composite and Its Application on 4-Nitrophenol Reduction

Synergistic Effect of Electrocatalytic Characteristics of a Redox Segment and Gas Barrier of rGO to Significantly Replace the Loading of Zinc Dust in Solvent-Based Epoxy Composites Applied for Heavy-Duty Anticorrosion Coatings

Water soluble redox‐active polyurethanes as efficient corrosive inhibitors for mild steel

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