An investigation into the degradation of polyaniline films grown on iron from oxalic acid

Fenelon, Anna M.; Breslin, Carmel B.

doi:10.1016/j.synthmet.2004.02.014

Cited by 43 publications

(16 citation statements)

References 27 publications

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“…It was observed that electrosynthesis of PANI film was affected from electropolymerization conditions such as electrolyte solution and potential range. On the other hand, the upper potential limit during the film growth was slightly higher than the degradation potential value for PANI, which is given as þ0.75 V [14,17] . However, it must be noted that the narrow potential range was unsuitable for homogenous and smooth PANI film in sodium oxalate medium.…”

Section: Resultsmentioning

confidence: 86%

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Polyaniline Top Coat Modified on Nickel-Plated Mild Steel: AC Impedance Analyzer

Özyılmaz

2006

Polymer-Plastics Technology and Engineering

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Polyaniline (PANI) was synthesized from 0.1 M aniline containing neutral medium such as sodium oxalate. The synthesis was achieved on 1-mm Ni-plated mild steel (MS=Ni) by using cyclic voltammetry technique. The corrosion performances of PANI coating with and without MS=Ni electrodes were evaluated by using AC impedance spectroscopy (EIS) and anodic polarization curves in 3.5% NaCl solution. It was found that Ni plating showed an important barrier property on MS. This case decreased drastically in longer periods, and the porosity values increased in chloride ions medium, which has small ion diameter. In the presence of PANI top coat, the porosity values remained almost constant against the attack of corrosive products for extended periods. It indicated that PANI coating could provide a significant protection property to MS=Ni, by catalyzing the formation of a stable nickel oxide layers with time. The catalytic behavior of polymer film also contributed to improvement of barrier property of PANI coating due to transformation to the reduced structure.

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Section: Resultsmentioning

confidence: 86%

“…Especially, there are the most studies that report anticorrosive applications of electrochemically synthesized conducting polymers [6][7][8][9][10][11][12][13][14] . However, the protection efficiency of primer coatings are quite limited for MS in artificial seawater.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline Top Coat Modified on Nickel-Plated Mild Steel: AC Impedance Analyzer

Özyılmaz

2006

Polymer-Plastics Technology and Engineering

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“…[18][19][20][21] Utilizing the generative rate of the product QI and the absorption spectra of BQ in the degradation solution to measure the extent of the films degradation in H 2 SO 4 , the results were shown in Figures 6 and 7. In Figure 6, the peak current of the third anodic wave (peak c) had been plotted vs. cycle number at a constant scan rate.…”

Section: Resultsmentioning

confidence: 99%

Effect of Quaternary Cations on the Electrochemical Synthesis of Polyaniline and Its Degradation

Sun

Zhang

Jiang

et al. 2005

Polym J

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ABSTRACT:Polyaniline(PANI) was prepared by adding three different quaternary ammonium salts to H 2 SO 4 electrolyte and the effect of the cations on the electrochemical degradation of PANI film was researched. The electropolymerized films were characterized by cyclic voltammetry, UV-vis spectroscopy and scanning electron microscopy. The result showed that quaternary cations hindered gradually the polymerization of aniline with increase of the size, which made the porosity of the film smaller and the morphology more compact compared with pure PANI films. Although the cations didn't change the electrode reactive process of PANI, they affected the oxidation velocity of the films and the degradation rate of PANI in the following order: PANI is considered to be the most promising conducting polymers due to its high electrical conductivity, excellent environmental stability, low-cost and easy preparation.1 The electrochemical stability of PANI and related materials is of great importance for their possible use in various electrochemical systems and devices, such as rechargeable batteries, electrochromic displays and sensors, etc.2-6 Therefore, much attention has been paid to study the stability and degradation of PANI.Up to now, discussing the effect of the nature and size of cations on PANI films is very significant for the preparation of PANI with good properties and extensive applications and many papers about simple inorganic cations have been reported. Min et al.7 synthesized PANI with high molecular weight by the technique of adding inorganic salts. Boroleet et al. ) and found that the conductivity of the films was increased. He et al.9 found that alkaline metal cations obviously accelerated the growth rate of PANI films in the following order:þ by employing ellipsometry and electrochemical methods. Giovani et al.10 also prepared PANI films in aniline solution containing different alkaline metal cations and found that the variation of the scan rate for only the first cycle affected the morphology, and therefore the electrical properties of PANI films grown potentiodynamically. However, only scarce information was available in the effect of quaternary cations on properties of PANI. The present work showed that quaternary cations hindered the degradation of the films, and the trends increased with the augment of the cations.In this paper we discussed the polymerization of aniline in H 2 SO 4 solution containing different quaternary cations (and the effect of cations on the degradation of PANI films in H 2 SO 4 in detail by UV-vis absorption spectra and cyclic voltammetry. EXPERIMENTAL All chemicals (aniline, H 2 SO 4 , Me 4 NBr, Et 4 NBr, Bu 4 NBr) were of AR grade and used without further purification. Doubly distilled water was employed to prepare all solutions. The electrochemical synthesis and characterization of PANI were carried out at room temperature in a standard three-electrode cell. The cell consisted of a platinum (Pt) wire (ca. 5 mm length and 0.5 mm diameter) or glassy carbon (GC) (ca. 3.0 mm diamete...

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“…[34,35] The TG and DTG curves show that the composite mainly undergoes four stages of degradation: a) loss of adsorbent water; b) removal of small molecules, such as bound water, NH 4þ and oligmers; c) degradation of polymeric chains; d) decomposition of polyaniline backbone and benzene ring-opening accompanying by other degradation processes ( Figure 5). [26] The TGA results for pure copper and the particulate composite under air atmosphere ( Figure 5) show that: First compositeoxidation is more stable than pure copper; second there are both weigh loss and weight gain stages in these curves and weigh gain proceeded just after some weigh loss. These The final weight ratio of pure copper and compositeoxidation are 125.0% and 112.5%.…”

Section: Thermal Analysis Of the Composites And Discussionmentioning

confidence: 98%

Coating Fine Copper Powder with Polyaniline

Chen

Guo

Jiang

et al. 2008

Journal of Dispersion Science and Technology

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To improve the stability of fine copper powder, three methods were tried to coat it with polyaniline. Pretreated, the powder was put into aniline solution. As ammonium persulfate solution was added slowly, aniline changed into polyaniline and coated on copper powder. It is proved that one of the methods is effective and can form good core-shell structure. The shell of the composite contains reduced undoped polyaniline and a little cuprous oxide. The composite has four stages of degradation in nitrogen and is more stable than fine copper powder in air.

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An investigation into the degradation of polyaniline films grown on iron from oxalic acid

Cited by 43 publications

References 27 publications

Polyaniline Top Coat Modified on Nickel-Plated Mild Steel: AC Impedance Analyzer

Polyaniline Top Coat Modified on Nickel-Plated Mild Steel: AC Impedance Analyzer

Effect of Quaternary Cations on the Electrochemical Synthesis of Polyaniline and Its Degradation

Coating Fine Copper Powder with Polyaniline

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