Enhancing the Stability of PPy Film on Ti by PEG Incorporation

Popescu, Simona; Pîrvu, Cristian; Mindroiu, Mihaela; Demetrescu, Ioana

doi:10.1080/15421401003720066

Cited by 8 publications

(4 citation statements)

References 21 publications

(15 reference statements)

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“…At high PEG concentration a decrease of bending displacement was observed [ 19 ]. Other research of PPy inclusion of PEG revealed that the hydrophilic characteristics increased [ 20 ] as well as discovery of a certain affinity of PEG to metallic cations rather than anions [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole with Phosphor Tungsten Acid and Carbide-Derived Carbon: Change of Solvent in Electropolymerization and Linear Actuation

et al. 2021

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Linear actuators based on polypyrrole (PPy) are envisaged to have only one ion that triggers the actuation direction, either at oxidation (anion-driven) or at reduction (cation-driven). PPy doped with dodecylbenzenesulfonate (PPy/DBS) is the most common applied conducting polymer having cation-driven actuation in aqueous solvent and mainly anion-driven actuation in an organic electrolyte. It is somehow desired to have an actuator that is independent of the applied solvent in the same actuation direction. In this research we made PPy/DBS with the addition of phosphorus tungsten acid, forming PPyPT films, as well with included carbide derived carbon (CDC) resulting in PPyCDC films. The solvent in electropolymerization was changed from an aqueous ethylene glycol mixture to pure EG forming PPyPT-EG and PPyCDC-EG composites. Our goal in this study was to investigate the linear actuation properties of PPy composites applying sodium perchlorate in aqueous (NaClO4-aq) and propylene carbonate (NaClO4-PC) electrolytes. Cyclic voltammetry and square potential steps in combination with electro-chemo-mechanical-deformation (ECMD) measurements of PPy composite films were performed. The PPyPT and PPyCDC had mixed ion-actuation in NaClO4-PC while in NaClO4-aq expansion at reduction (cation-driven) was observed. Those novel PPy composites electropolymerized in EG solvent showed independently which solvent applied mainly expansion at reduction (cation-driven actuator). Chronopotentiometric measurements were performed on all composites, revealing excellent specific capacitance up to 190 F g−1 for PPyCDC-EG (best capacitance retention of 90% after 1000 cycles) and 130 F g−1 for PPyPT-EG in aqueous electrolyte. The films were characterized by scanning electron microscopy (SEM), Raman, Fourier-transform infrared (FTIR) and energy dispersive X-ray spectroscopy (EDX).

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Section: Introductionmentioning

confidence: 99%

Polypyrrole with Phosphor Tungsten Acid and Carbide-Derived Carbon: Change of Solvent in Electropolymerization and Linear Actuation

et al. 2021

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“…In order to improve the surface characteristics of the Ti alloy/PPy electrode system, a composite PPy‐PEG film was electropolymerized on Ti6Al7Nb alloy in the presence of 4% PEG (400 molecular weight). This concentration of PEG was established after previous research on pure titanium 28, which showed that 3–4% PEG is optimal for obtaining the best electrochemical stability of PPy/PEG composite.…”

Section: Methodsmentioning

confidence: 99%

Corrosion and biocompatibility of PPy/PEG coating electrodeposited on Ti6Al7Nb alloy

Mindroiu

Pîrvu

Cîmpean

et al. 2012

Materials & Corrosion

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This work aims to improve the corrosion rate of Ti6Al7Nb alloy and to increase its biocompatibility at the same time, obtaining polymer composite films based on polypyrrole/polyethylene glycol (PPy/PEG). The elaboration method was electrodeposition. FT‐IR analysis was performed in order to emphasize the formation of the PPy‐PEG composite film by incorporating PEG into the polymer structure. The paper is focussed on PEG (400 molecular weight) effect on the corrosion in bioliquids (as tested electrochemical bioliquid was chosen Hank's balanced salt solution) and on the biocompatibility properties. The PPy film significantly improves the biocompatibility of the Ti6Al7Nb alloy. The PEG presence in the polymerization solution leads to more stable composite polymer films on the titanium alloy surface with a better corrosion resistance and a more hydrophilic behaviour comparing with the PPy film. The increase of cell viability and proliferation potential as compared to the PPy film is not important.

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“…A polypyrrole/polyethylene glycol (PPy/PEG) composite coating was proposed for platinum [11], ITO [12], and titanium [13]. However, to the best of our knowledge, there is a lack of information about the deposition of PPy/PEG coating onto Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of polypyrrole coating modified by sodium fluoride and polyethylene glycol on corrosion behaviour of AZ31 magnesium alloy

Saremi

Mortazavi

2016

Micro & Nano Letters

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A polypyrrole (PPy) coating modified by sodium fluoride (NaF) and polyethylene glycol 4000 (PEG) on AZ31 magnesium alloy is reported. The aim of this work was to obtain a composite coating with NaF and PEG in PPy matrix by electropolymerisation process. The idea was to form a stable PPy coating with higher resistance to corrosion damage. Prior to this process, the effect of sodium salicylate pre-treatment on PPy electropolymerisation was investigated by cyclic voltammetry technique. Electrochemical impedance spectroscopy (EIS) and polarisation analysis was performed in 0.05 M NaCl solution to characterise the corrosion behaviour of each sample. EIS results showed that the addition of NaF and PEG could enhance the corrosion resistance (R ct) of PPy coating. Also, the corrosion current density for NaF + PEG (incorporated in PPy) was demonstrated a value 60 times lower than that of bare AZ31 Mg alloy. The better corrosion behaviour of PPy composite coating with NaF and PEG was attributed to inhibition effect of fluoride which could act as barrier for Mg alloys. Moreover, PEG can stabilise the PPy structure because of its high oxygen content. Furthermore, the addition of NaF and PEG simultaneously could show a synergistic behaviour because of the positive effect of PEG on fluoride mobility.

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Enhancing the Stability of PPy Film on Ti by PEG Incorporation

Cited by 8 publications

References 21 publications

Polypyrrole with Phosphor Tungsten Acid and Carbide-Derived Carbon: Change of Solvent in Electropolymerization and Linear Actuation

Polypyrrole with Phosphor Tungsten Acid and Carbide-Derived Carbon: Change of Solvent in Electropolymerization and Linear Actuation

Corrosion and biocompatibility of PPy/PEG coating electrodeposited on Ti6Al7Nb alloy

Effect of polypyrrole coating modified by sodium fluoride and polyethylene glycol on corrosion behaviour of AZ31 magnesium alloy

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