Double corrosion protection mechanism of molybdate-doped polypyrrole/montmorillonite nanocomposites

Trung, Vũ Quốc; Hoan, Phạm Văn; Phung, Duong Quang; Đức, Lê Minh; Hằng, Lê Thị Thu

doi:10.1080/17458080.2012.656710

Cited by 20 publications

(7 citation statements)

References 20 publications

(30 reference statements)

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“…In recent years, conjugated polymers have been being widely studied and used in science and technology as well as in semiconductor devices [ 1 , 2 ], sensors [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ], batteries [ 10 , 11 ], super- capacitors [ 10 , 12 ], electromagnetic shielding materials [ 13 , 14 ], and corrosion-resistant materials [ 15 , 16 , 17 , 18 , 19 , 20 ]. The properties of these materials may be greatly affected by doping/introduction of various substituents groups due to a modification of the electronic density of the molecules.…”

Section: Introductionmentioning

confidence: 99%

DFT Prediction of Factors Affecting the Structural Characteristics, the Transition Temperature and the Electronic Density of Some New Conjugated Polymers

et al. 2020

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Conjugated polymers are promising materials for various cutting-edge technologies, especially for organic conducting materials and in the energy field. In this work, we have synthesized a new conjugated polymer and investigated the effect of distance between bond layers, side-chain functional groups (H, Br, OH, OCH3 and OC2H5) on structural characteristics, phase transition temperature (T), and electrical structure of C13H8OS using Density Functional Theory (DFT). The structural characteristics were determined by the shape, network constant (a, b and c), bond length (C–C, C–H, C–O, C–S, C–Br and O–H), phase transition temperatures, and the total energy (Etot) on a base cell. Our finding shows that the increase of layer thickness (h) of C13H8OS–H has a negligible effect on the transition temperature, while the energy bandgap (Eg) increases from 1.646 eV to 1.675 eV. The calculation of bond length with different side chain groups was carried out for which C13H8OS–H has C–H = 1.09 Å; C13H8OS–Br has C–Br = 1.93 Å; C13H8OS–OH has C–O = 1.36 Å, O–H = 0.78 Å; C13H8OS–OCH3 has C–O = 1.44 Å, O–H =1.10 Å; C13H8OS–OC2H5 has C–O = 1.45 Å, C–C = 1.51Å, C–H = 1.10 Å. The transition temperature (T) for C13H8OS–H was 500 K < T < 562 K; C13H8OS–Br was 442 K < T < 512 K; C13H8OS–OH was 487 K < T < 543 K; C13H8OS–OCH3 was 492 K < T < 558 K; and C13H8OS–OC2H5 was 492 K < T < 572 K. The energy bandgap (Eg) of Br is of Eg = 1.621 eV, the doping of side chain groups H, OH, OCH3, and OC2H5, leads to an increase of Eg from 1.621 eV to 1.646, 1.697, 1.920, and 2.04 eV, respectively.

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Section: Introductionmentioning

confidence: 99%

DFT Prediction of Factors Affecting the Structural Characteristics, the Transition Temperature and the Electronic Density of Some New Conjugated Polymers

et al. 2020

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“…Besides, salicylate ion has been also known as an effective inhibitor dopant of PPy film on iron. − In our recent articles, it was discussed that molybdate dopant can play a role as an inhibitor for PPy smart coatings. Single doping with molybdate anion into PPy films or ion exchange by the polarization of PPy films was reported to provide a self-healing effect for PPy coatings on iron. − They can be released from the film during the reduction process and keep the open circuit potential (OCP) of iron in the passive zone for a long time. Doping both salicylate and molybdate anions into PPy films may be thus expected to enhance even more the corrosion protection performance of LCS.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polypyrrole Film Doped with Both Molybdate and Salicylate and Its Application in the Corrosion Protection for Low Carbon Steel

et al. 2022

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Polypyrrole (PPy) films doped with molybdate and salicylate have been successfully electropolymerized on low carbon steel in aqueous solutions containing both molybdate and salicylate in a one-step process that did not require any pre-treatment of the steel substrate. Salicylate-doped PPy films were synthesized in the same way for comparison. The steel surface was rapidly inhibited and the PPy-based films were formed on it easily. The PPy-based films were characterized by Fourier transform infrared, scanning electron microscopy, energy dispersive X-ray, and thermal gravimetric analysis methods. The corrosion protection performance of the coatings was investigated with electrochemical impedance spectroscopy, open circuit potential (OCP), salt spray test, and Tafel polarization. It was found that in the presence of both molybdate and salicylate as dopants, the films on steel could present a better corrosion resistance than PPy film doped with only salicylate. The self-healing property of PPy-based films was observed on the OCP measurement with the fluctuation of rest potential. The salt spray test results showed that the PPy film doped with both salicylate and molybdate was more salt-resistant than the PPy film doped with only salicylate. The results suggest that the PPy coatings doped with both molybdate and salicylate are potential for application as metallic anti-corrosion coatings.

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“…Among various conducting polymers, PPy has become frequently studied because of its good electrical conductivity, environmental stability, and easy synthetic process . Recently, PPy/clay composites have gained significant interest for important technological applications, such as gas sensors, semiconducting nanomaterial, cathode material for oxygen reduction, metal corrosion protection, and removal of metal . Introducing montmorillonite (Mt) into PPy matrix improves the thermal stability, gas barrier, mechanical properties, and tunable electrical conductivity of hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

Electroconductive and catalytic performance of polypyrrole/montmorillonite/silver composites synthesized through in situ oxidative polymerization

Tran

Park

Hussain

et al. 2017

J of Applied Polymer Sci

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The present study demonstrates a simple approach to the formation of polypyrrole/montmorillonite/silver (PPy/Mt/Ag) composites via in situ oxidative polymerization of pyrrole (Py) in the presence of AgNO3 acting as a direct oxidant. The polymerization was performed in the presence of dodecylbenzenesulfonic acid, which acts as a stabilizing and doping agent. The morphological, structural, and thermal properties of PPy/Mt/Ag composites are discussed in detail and a possible formation mechanism is proposed. The electrical conductivities of the composites pressed at different pressing pressures were investigated using four‐probe analyzer. X‐ray diffraction, transmission electron microscopy, and scanning electron microscopy results indicated the partially exfoliated structure of the composites and Fourier transforms infrared results suggested the strong interactions between SiOSi groups in Mt and NH groups in PPy chains. The addition of Mt in the PPy polymer enhanced thermal property of the polymer. The conductivity of 1.08 S cm−1 was observed in the sample with 20 wt % Mt loading and applied pressure of 5 MPa. The composites obtained in the present study catalyze the reduction of methylene blue by sodium borohydride, achieving 92% conversion of MB to colorless within a few minutes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45986.

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Double corrosion protection mechanism of molybdate-doped polypyrrole/montmorillonite nanocomposites

Cited by 20 publications

References 20 publications

DFT Prediction of Factors Affecting the Structural Characteristics, the Transition Temperature and the Electronic Density of Some New Conjugated Polymers

DFT Prediction of Factors Affecting the Structural Characteristics, the Transition Temperature and the Electronic Density of Some New Conjugated Polymers

Synthesis and Characterization of Polypyrrole Film Doped with Both Molybdate and Salicylate and Its Application in the Corrosion Protection for Low Carbon Steel

Electroconductive and catalytic performance of polypyrrole/montmorillonite/silver composites synthesized through in situ oxidative polymerization

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