Design, synthesis, and evaluation of high‐performing anticorrosive polyurethane coatings with inbuilt redoxable oligomeric aniline segments

Paradhakshina, Ermiya Prasad; Arukula, Ravi; Palanisamy, Aruna; Narayan, Ramanuj; Rao, Chepuri R. K.

doi:10.1002/app.54507

Cited by 4 publications

(3 citation statements)

References 83 publications

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“…The product was then dried in a vacuum oven at 50°C overnight, resulting in a compound yield of 83.0%. These structures were confirmed by HRMS, which have resulted an m/z value of 380 (M + 1 peak, actual mass is 379) and 289 (M + 1 peak, actual mass is 288) for DCTAni and DCTA, respectively 40 . H 1 ‐NMR spectra of DCTA, DCTAni, and corresponding PUr‐DCTA and PUr‐DCTAni was confirmed and shown in Figures S2 and S3 in supporting information, respectively.…”

Section: Methodssupporting

confidence: 53%

“…Two types of PUr were synthesized as shown in Scheme 2 with DCTA and DCTAni and those are named as PUr‐DCTA and PUr‐DCTAni 40 . PUr‐DCTA was synthesized by using the trimer (1 g, 0.00347 mol) with 40 mL of MEK solvent stirred for 30 min while nitrogen gas was flushed.…”

Section: Methodsmentioning

confidence: 99%

“…38 and DCTAni and those are named as PUr-DCTA and PUr-DCTAni. 40 PUr-DCTA was synthesized by using the trimer (1 g, 0.00347 mol) with 40 mL of MEK solvent stirred for 30 min while nitrogen gas was flushed. To the stirring mixture, IPDI (0.77 g, 0.00347 mol) was added dropwise constantly followed by two drops of DBTDL catalyst (50% solution in MEK).…”

Section: Synthesis Of Thermoplastic Puu Matrixmentioning

confidence: 99%

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Electroactive additives into polyurethanes for high corrosion resistance coatings for mild steel

Borah,

Palanisamy

et al. 2024

Polymers for Advanced Techs

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There is a demand for innovative coatings such as polyurethane (PU) in industrial and commercial sectors to effectively combat corrosion on mild steel substrates. In this work, novel redox‐active polyurea (PUr) additives such as PUr‐diamine capped trimer (DCTA) and PUr‐diamine‐capped tetraaniline (DCTAni), derived from DCTA and DCTAni, were synthesized to enhance the anticorrosion properties of PU coatings. These are characterized using 1H nuclear magnetic resonance spectroscopy, Fourier transformed infrared, and high‐resolution mass spectrometry technical methods. These additives (2, 5, and 10 wt%) were dispersed in a polyurethane‐urea (PUU) matrix, which was synthesized from PTMG‐2000, and IPDI with dihydrazide adipate as a chain extender. The electroactivity of the coatings were evaluated using cyclic voltammetry (CV) and ultraviolet–visible spectroscopy. Furthermore, anticorrosion performance was assessed through electrochemical impedance spectroscopy and Tafel potentiodynamic polarization measurements. The optimal corrosion protection was achieved with increasing weight percent (wt%) of additive in PUU, showing a trend of 10% > 5% > 2%. Coatings reported maximum polarization resistance (Rp) of 122.15 MΩ, with corrosion rates (CR) as low as 2.38 × 10−6 mm/year. Accelerated salt spray testing over 600 h in a 5 wt% NaCl salt fog confirmed the coatings' durability. The microstructures of PUr particles were determined through FESEM characterization. Additive‐blended PUUs exhibited moderate tensile strength and elongation at break compared to the reference PUU matrix. The hydrophobicity of both the reference sample (PUU) and the additive‐blended coatings was measured, with the highest recorded value being at 93.1 ± 0.048 for 10 wt%. Thermal gravimetric analysis demonstrated polymer degradation with a maximum of T5% observed at 304.1°C.

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Section: Methodssupporting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of Thermoplastic Puu Matrixmentioning

confidence: 99%

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Electroactive additives into polyurethanes for high corrosion resistance coatings for mild steel

Borah,

Palanisamy

et al. 2024

Polymers for Advanced Techs

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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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Electrochemical synthesis, physical properties and corrosion behavior of electropolymerized polyaniline films developed on 316L stainless steel

de Carvalho Filho,

Bastos,

de Vasconcelos

et al. 2024

J of Applied Polymer Sci

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Polyaniline (PANI) films may be developed on metallic substrates by a variety of electrochemical techniques. In the present work, PANI films were electrodeposited on AISI 316L stainless steel substrates by cyclic voltammetry (CV), chronoamperometry (CA), and chronopotentiometry (CP) with the objective of comparing the efficacy of each method, based on the integrity of the developed films. Cyclic voltammetry and anodic polarization were used to determine optimal electrodeposition parameters for the development PANI films using the CA and CP methods. The structure and morphology of the coatings were characterized by scanning electron microscopy, energy‐dispersive x‐ray spectroscopy, Fourier‐transform infrared spectroscopy, and ultraviolet–visible spectroscopy. Among the evaluated techniques, CV led to the formation PANI films with the best homogeneity as well as the lowest number of defects, such as cracks or pores. Subsequently, the corrosion resistance of AISI 316L steels with and without PANI was compared in a physiological saline solution (0.9% NaCl). Potentiodynamic polarization tests indicated that the PANI‐coated samples exhibited lower corrosion current density values (0.012 vs. 0.018 μA/cm2) and lower passive current density values (0.04 vs. 0.06 μA/cm2) in comparison to the bare AISI 316L steel. Additionally, long‐term monitoring by electrochemical impedance spectroscopy revealed that PANI films consistently exhibited superior polarization resistance up to 32 days of exposure in the 0.9%NaCl solution (233,000 vs. 207,000 Ωcm2).

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Design, synthesis, and evaluation of high‐performing anticorrosive polyurethane coatings with inbuilt redoxable oligomeric aniline segments

Cited by 4 publications

References 83 publications

Electroactive additives into polyurethanes for high corrosion resistance coatings for mild steel

Electroactive additives into polyurethanes for high corrosion resistance coatings for mild steel

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

Electrochemical synthesis, physical properties and corrosion behavior of electropolymerized polyaniline films developed on 316L stainless steel

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