Electroconductive Coatings

Polyaniline (PAni), which has been known for more than a hundred years, was modified in the 1980s. The conductivity of polyaniline was raised from 10 to 10 Ohm -cm at BASF Company (Nuarman H.) in conditions of high experimental reproducibility and strict control over polymerization. The indicated values surpass the conductivity of metals such as Fe and Pt, 

Thin films were created after immersion of Mg alloy samples in a specially formulated emulsion of polyacrilic and PPy pol3miers. This resulted in better corrosion resistance of coated Mg foils in neutral aqueous NaCl solutions [23]. 

Air Product and Chemicals, Inc. (USA) have found out that (in the absence of any topcoat) while the doped electrically conductive form of PAni performed well as a corrosion-resistant coating for carbon steel, the undoped, nonconductive form of PAni performed better. This was determined by electrochemical impedance spectroscopy (EIS), immersion testing (3wt % NaCl) and salt fog testing. Perfect performance of undoped PAni could be understood as follows. From the high pore-resistance value observed (2-10 U) it can be concluded that PAni forms a dense, adherent, low porosity film on carbon steel. Such a film would restrict the access of components required for corrosion to occur  

EIS is commonly employed for the evaluation of coatings. Poor resistance values of electrodeposited PPy coatings have been demonstrated to be good predictors of long-term coating performance in corrosion prevention [24]. 

It was found (with the EIS technique) that PAni blending with a poly-imide (prepared by solution blending) improved the corrosion resistance performance of polyimide. PAni can react with polyimide to form chemical bonds 

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Copolymers of diallyl dimethyl ammonium chloride [7398-69-8] with acrylamide have been used in electroconductive coatings (155). Copolymers with acrylamide made in activated aqueous persulfate solution have flocculating activity increasing with molecular weight (156). DADM ammonium chloride can be grafted with cellulose from concentrated aqueous solution catalysis is by ammonium persulfate (157). Diallyl didodecylammonium bromide [96499-24-0] has been used for preparation of polymerized vesicles (158). 

Transparent electroconductive coatings of stannic oxide are deposited on nonconductive substrates for electrical and strengthening appHcations. However, the agents used to deposit the oxide film are actually stannic chloride. More recently, some organotin compounds have been employed. 

Bladergroen BJ, Maluleke MA, and Linkov VM. Electroconductive coatings on porous ceramic supports. J Appl Electrochem 2003 33(Suppl.) 475 81. 

Electroconductive coatings Biomagnetic separations Fuel cells... 

Electroconductive coatings N- Vinylpyrrolidone W. Germany 2,003,191 1970 Agfa-Gevaert... 

Water purification can be achieved by decomposition or destruction of the pollutant on contact with an electrically charged surface. In several cases permeable electrodes are used in a flow-through mode to ensure contact between the pollutant and the electrode. The type of electrode ranges from metal meshes and carbon cloths to ceramic membrane supports coated with a porous layer of electroconductive material. 

To confer electroconductivity upon porous ceramics these materials were coated with a layer of pyrolytic carbon. The deposition of carbon was carried out in the gas phase by pyrolysis of natural gas. The ceramic materials were placed in a quartz reactor under 50 mL/min flow of natural gas. The pyrolysis took place at 900°C for 30 min. 

The electromembrane reactor used in the study was a flow-through undivided electrocatalytic cell. The principal feature of the cell is the ceramic-based sheet, which was coated with the carbon-supported catalyst on one side. The coated side was used as the anode and the cathodic side was not coated with any electroconductive substance or catalyst. Current was supphed to the anode and cathode by means of backing layers, which are connected, to the external power source by means of a conducting wire. The backing layers that were used in this study are carbon cloths 6100-200 purchased from Lydall, United States. 

An optically active and electroconductive polymeric sorbent was prepared by coating the PS-L-proline-Cu(II) beads with conducting polymer polypyrrole. Applying a potential difference of 1.5 V to the column, racemic lysine and aspartic acid were separated according to their charge characteristics and were simultaneously resolved with respect to their optical isomerism. 

Use Electroconductive and electroluminescent coatings, mordant in dyeing textiles, perfume stabilization, manufacture of fuchsin, color lakes, ceramic coatings, bleaching agent for sugar, stabilizer for certain resins, manufacture of blueprint and other sensitized papers, other tin salts, bacteria and fungi control in soaps. 

ITRI has developed and patented processes for preparing and utilizing stable aqueous colloidal sols of tin(IV) oxide and related materials. These products, which contain nanometer-scale particulate tin oxide, are useful precursors for the synthesis of ceramic bodies, powders, and coatings, and may And application in encapsulated pigments, electroconductive materials, catalysts, and transparent tin oxide Aims on glass and other substrates. 

Co. It consists of a sheet of paper coated with an electroconductive resin. 

Composite film coatings comprising nanodisperse silver are under intensive investigation nowadays being of interest as promising electroconductive metal-polymer systems, nonlinear optical materials, selective and active catalysts. 

Chem. Descrip. Rutile titanium dioxide, stannic oxide/antimony doped Uses Electroconductive pigment, antistat for anti-electrostatic coatings and primers on plastics, rubber, textiles, recording paper substrates, for mfg. of electronic equip, and components for clean room construction Features Inc. physical str. of moldings and paint films requires smaller loading amts. exc. chem. /physical stability against humidity natural whiteness for easy coloring... 

Chem. Descrip. Antimony-doped tin oxide coated onto inert core (mica) Uses Electroconductive additive in coatings and plastics for ESD protection in electronic component pkg., floor/wall coatings, plastics, laminates electrostatic painting (automotive primers) dielec, film and paper toners... 

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