Polypyrrole coatings properties

H. Yoneyama, K. Wakamoto, and H. Tamura, Photoelectrochemical properties of polypyrrole-coated silicon electrodes, J. Electrochem. Soc. 132 2414, 1985. 

N. Gopal Sahoo, Y.C. Jung, HJT. So, and J.W. Cho, Polypyrrole coated carbon nanotubes Synthesis, characterization, and enhanced electrical properties, Synth. Met., 157,374—379 (2007). 

Figure 16.8 Representation of the coated iron sample (PPy + top-coat) and its defect in contact with KCI solution. Delamination is followed by SKP measurements. (Reprinted with permission from Corrosion Science, On the development of polypyrrole coatings with seifhealing properties for iron corrosion protection by G. Paliwoda-Porebska, M. Stratmann, M. Rohwerder et al., 47, 12, 3216-3233. Copyright (2005) Elsevier Ltd)...

Paliwoda-Porebska, G., Stratmann, M., Rohwerder, M., Potje-Kamloth, K., Lu, Y, and Pich, A. Z. On the development of polypyrrole coatings with self-healing properties for iron corrosion protection. Corrosion Science, 47(12), 3216-3233 (2005). 

Su, W., and J.O. Iroh. 1998. Effects of electrochemical process parameters on the synthesis and properties of polypyrrole coatings on steel. Synth Met 95 159. 

De Giglio, E., L. Sabbatini, S. Coined, and G. Zambonin. 2000. Synthesis, analytical characterization, and osteoblast adhesion properties on RGD-grafted polypyrrole coatings on titanium substrates. 7 Biomater Sci—Poly Ed 11 1073. 

Herrasti, P., et al. 2004. Electrochemical and mechanical properties of polypyrrole coatings on steel. Electrochim Acta 49 (22-23) 3693. 

There are many applications where the physical properties of a textile substrate are combined with the electrical and shielding properties of polypyrrole. Thus polypyrrole-coated fabrics show excellent dissipation properties. In this way industrial uniforms where explosion-proof conditions or shielding fi om micro-waves are necessary can be fabricated, as well as the use of polypyrrole-coated filters where static charges could cause the explosion of flammable solvents. Other important applications are related to military equipment, as radar-absorbing sheets. The microwave response of those fabrics seems to be ideal for camouflage nets that avoid visual, near-infrared and radar detection. Textile fabrics have also applications in fiber-reinforced composite structures of different resins. 

The surface morphology and mechanical properties of polypyrrole coatings using different electrodeposition methods have been compared by Herrasti et al. [80]. Polypyrrole films have been deposited on steel by three electrochemical methods constant potential, constant current, and cyclic voltammetry. The deposition was conducted in a three-electrode cell in 0.1 M LiC104 and 0.5 M pyrrol. The working... 

Customers of Milliken report that polypyrrole-coated fabrics show instant dissipation of static electricity with excellent tunneling characteristics. These properties allow a number of industrial applications such as in coated fabrics, abrasive belts [92], conveyor belts, high speed composite rollers, carpets, upholstery fabrics, uniforms, gloves, wrist straps, and filtration. Contex fabrics have been suggested for use as a wrist rest static mats to dissipate static charging near computer keyboards [91]. 

H. H. Kuhn, Polypyrrole coated textiles, properties and applications, Sen-i Gakkai Svmp. Prepr. A 103 (1991). 

The use of the electric field has been proposed and demonstrated to perform very well in defining various other properties. For example, electrical measurements have been used to monitor the foaming process and polymerization of polymeric foams [74], while dielectric measurements have been used for measuring the density of polymer foams [75]. Brady et al. [76] developed electrically conductive polypyrrole-coated PUR foam. The conductance of the foam was found to change linearly with the compressive load applied single and repeated. For aluminum foams, Kim et al. [77] developed a set of mathematical relationships based on experimental data to obtain mechanical properties (elastic modulus, compressive strength, and densification strain), using electrical conductivity as a non-destructive inspection method. 

Xiaotun Y, Lingge X, Choon NS, Hardy CSO (2003) Magnetic and electrical properties of polypyrrole-coated -Fe203 nanocomposite particles. Nanotechnology 14 624-629... 

Cao J, Hu G, Peng Z et al (2015) Polypyrrole-coated LiCo02 nanocomposite with enhanced electrochemical properties at high voltage for lithium-ion batteries. J Power Sources 281 49-55... 

When oxalic acid is used to form the polypyrrole coating, the result is a film that is very stable in time without a significant change in the corrosion behaviour properties after 72 h of immersion to sodium chloride solution. The net corrosion current naturally increases after 72 h of immersion and is followed by a decrease in the polarisation resistance, but overall, it is a very stable system, with a safe passivation range (Fig. 15.9a,b. Table 15.5). Over-oxidation of a part of polypyrrole films would have occurred as discussed, but the amount of degraded polypyrrole should be small as the release of doping anions, a property of well formed conducting polymer film, is clearly seen. 

X. Jin, W. Wang, L. Bian, C. Xiao, G. Zheng, and C. Zhou. The effect of polypyrrole coatings on the adhesion and structure properties of UHMWPE fiber. Synthetic Metals 161, 984-989 (2011). 

---