Anticorrosive properties of epoxy resin coatings cured by aniline/<i>p</i>‐phenylenediamine copolymer

Yao, Bin; Wang, Gengchao; Li, Xingwei; Zhang, Zhiping

doi:10.1002/app.29658

Cited by 14 publications

(7 citation statements)

References 31 publications

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“…This concept is supported by two observations: (1) Only small amounts of PDA are needed for the initiation of aniline polymerization. If PDA participated only as a comonomer in the propagation step (and PDA indeed copolymerizes with aniline − ), much larger quantities would be needed to produce a marked effect. (2) The phenazine nucleates are able to self-assemble and to guide the subsequent growth of nanogranules, nanofibers, or nanotubes .…”

Section: Resultsmentioning

confidence: 99%

Oxidation of Aniline with Silver Nitrate Accelerated by p-Phenylenediamine: A New Route to Conducting Composites

et al. 2010

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The reaction between two nonconducting compounds, aniline and silver nitrate, yields a composite of two conducting products, PANI and silver. While the oxidation of aniline with silver nitrate is slow and takes over several months, the addition of a small amount of p-phenylenediamine, 1 mol % relative to aniline, shortens the reaction time to a few hours and, with higher concentrations of p-phenylenediamine, even to tens of minutes. Nonconducting aniline oligomers, however, are also present in the oxidation products as a rule. The chemistry of individual oxidation pathways is discussed. Higher concentrations of p-phenylenediamine in the reaction mixture with aniline give rise to copolymers, poly[aniline-co-( pphenylenediamine)]s, and their composites with metallic silver. p-Phenylenediamine alone can similarly be oxidized with silver nitrate to poly(p-phenylenediamine) composite with silver. Silver is present in the composites both as nanoparticles of ∼50 nm size and as larger objects. The composites have conductivity in the range of the order of 10 -3 -10 3 S cm -1 at comparable content of silver, which was close to the theoretical expectation, 68.9 wt %. The composites prepared in 1 M acetic acid always have a higher conductivity compared with those resulting from synthesis in 1 M nitric acid. The polymerizations of aniline accelerated with 1 mol % of p-phenylenediamine in 1 M acetic acid yield a composite of the highest conductivity, 6100 S cm -1 . At higher contents of p-phenylenediamine, poly[aniline-co-( p-phenylenediamine)] composites with silver have a conductivity lower by several orders of magnitude. The oxidation of p-phenylenediamine alone with silver nitrate in 1 M acetic acid also yields a conducting composite, its conductivity being 1750 S cm -1 . The semiconductor type of conductivity in polymers and the metallic type of conductivity in silver may compensate to yield composites with conductivity nearly independent of temperature over a broad temperature range.

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Section: Resultsmentioning

confidence: 99%

Oxidation of Aniline with Silver Nitrate Accelerated by p-Phenylenediamine: A New Route to Conducting Composites

et al. 2010

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“…Therefore, the corrosion inhibition of AT may be ascribed to the presence of electron-rich N and aromatic rings. Nevertheless, the amino and imino groups of aniline tetramer can also crosslink and cure with the epoxy resin and produce the shielding effect [26]. Therefore, epoxy coating with or without AT was characterized by dynamic thermomechanical analysis.…”

Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

Preparation and Anticorrosive Property of Soluble Aniline Tetramer

et al. 2019

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Soluble aniline tetramer (AT) was successfully prepared by chemical oxidation method. Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-vis) were used to characterize its structure. The redox behavior of AT was identified through the electrochemical cyclic voltammetry studies. Then, the epoxy coating was prepared by using AT as inhibitor. Its anticorrosive property was evaluated by salt solution resistance test, polarization curve, and electrochemical impedance spectroscopy (EIS). Salt solution resistance test, polarization curves, and EIS measurements indicate that the obtained epoxy anticorrosive coating, containing 1.0% AT, exhibits remarkably enhanced corrosion protection properties on Q235 steel electrodes as compared to pure epoxy anticorrosive coating without AT. The significantly improved anticorrosion performance may be owing to the redox behavior of the AT, adsorption and inhibition effect of AT on Q235 steel surface, as well as synergistic curing effect by AT and polyamide.

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“…The peak at d ¼ 3.4 ppm corresponds to the OCH 3 group and the two peaks at d ¼ 3.7 ppm are for -NH and -NH 2 . 12 The singlet signal at d ¼ 2.5 ppm was correlated to the solvent protons.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the copolymerization of o-phenyldiammine has remarkably improved some of the properties like stability, conductivity and solubility 7 . Yao et al have synthesized aniline-p-phenyldiammine copolymer and reported its corrosion protection performance using electrochemical measurements 12 , their Icorr values in 5 % NaCl medium was found to be 0.06µA/cm 2 . in 5% HCl 10 .…”

Section: Introductionmentioning

confidence: 99%

“…10 Chaudhari et al have electrochemically synthesized polyethoxyaniline and studied its protective behaviour on carbon steel in 3% NaCl solution using EIS and potentiodynamic studies. 11 Yao et al have synthesized aniline-p-phenyldiammine copolymers and reported their corrosion protection performance using electrochemical measurements, 12 their I corr value in 5% NaCl medium was found to be 0.06 mA cm À2 . Similarly, Ping et al have demonstrated the synthesis and the formulation of aniline-p-phenyldiammine copolymers using TX-8 emulsier as the surfactant.…”

Section: Introductionmentioning

confidence: 99%

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Conducting poly(o-anisidine-co-o-phenyldiammine) nanorod dispersed epoxy composite coatings: synthesis, characterization and corrosion protective performance

2015

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Conducing polymers (CPs) have been significantly contributing to the development of high performance new-generation anti-corrosive coatings. CPs nanofiller dispersed insulating polymer coating effectively prevents the transport of corrosive ions (H + , O 2-, Cl -, OHetc) at coating-metal interface, via barrier or redox mechanism. In view of this, for the first time, we report the synthesis of poly (o-anisidine-co-o-phenyldiammine) P(oA-co-oPDA) copolymer conducting nanorods. Poly (o-anisidine) (PoA) conducting nanoparticles were also synthesized laterally. The formulation of these nanofillers dispersed epoxy-polyamide (PA) nanocomposite coating systems have also been reported. The structural elucidation was performed by FT-IR, UV-Vis, 1 H NMR spectroscopy. The crystallnity, surface area and morphology of fillers were analysed by XRD, BET, SEM and TEM techniques. The thermal stability and hydrophobic behaviour were investigated using TGA, DSC and contact angle measurements. The physicomechanical properties and corrosion protective performance of these coatings were evaluated using standard methods. The salt spray test, potentiodynamic polarization (PDP) and electron impedance spectroscopy studies (EIS) were conducted in 5 wt % NaCl and 5 wt % HCl media.3 revealed that the P(oA-co-oPDA)-epoxy-PA nanocomposite coating have exhibited superior performance than those of PoA-epoxy-PA, epoxy-PA and other such nanocomposite coatings.

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Anticorrosive properties of epoxy resin coatings cured by aniline/p‐phenylenediamine copolymer

Cited by 14 publications

References 31 publications

Oxidation of Aniline with Silver Nitrate Accelerated by p-Phenylenediamine: A New Route to Conducting Composites

Oxidation of Aniline with Silver Nitrate Accelerated by p-Phenylenediamine: A New Route to Conducting Composites

Preparation and Anticorrosive Property of Soluble Aniline Tetramer

Conducting poly(o-anisidine-co-o-phenyldiammine) nanorod dispersed epoxy composite coatings: synthesis, characterization and corrosion protective performance

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