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Spectroscopic and diffraction studies of chemical deposition of copper sulfide films on polyamide surface using potassium pentathionate

Krylova V.

Materials Science Poland

2007

Vol. 25, No. 4

933--945

Sulfur sorption-diffusion by polyamide PA 6 film exposed to potassium pentathionate K2S5O6 solutions was investigated by the UV, IR absorption spectroscopy and chemical analysis methods. 2 5 6 S O -?anions were found to sorb into the polymer. The study of sulfur sorption-diffusion kinetics showed that the concentration of sorbed pentathionate ions in polyamide film increased with increasing duration of treatment and the temperature of solution. Sulfur concentration in the polymer was found to depend on the conditions of sorption and varied between 0.94 and 7.64 mg/cm3. The estimated apparent diffusion coefficients of 2 5 6 S O -?ions in polyamide increased with increasing temperature of K2S5O6 solution. On treating sulfured polyamide film with copper(I) salt solution, copper sulfide (CuxS) layers are formed in the surface matrix of the polymer. The content of CuxS depended on the concentration of 2 5 6 S O - ions in the polyamide matrix. Initially dielectric, polyamide films after formation of CuxS layers in their surface matrix become electrical conductors. Samples sulfured in K2S5O6 solution at 293 K for 240 min were the most conductive. X-ray diffraction studies of CuxS layers revealed the presence of two phases: chalcosine and djurleite.

Formation of Copper Sulfide Layers on the Surface of Polyethylene Films of Various Density by the Use of Polythionic Acids

Ancutiene I., Janickis V., Giesa R.

Polish Journal of Chemistry

2004

Vol. 78 / nr 3

349-360

The kinetic study of sulfur adsorption-diffusion processes from higher polythionic acid, H2S33O6, solution into polyethylene films of high, medium and low density showed that the sulfur concentration in polyethylene of various density and thickness increases with increasing temperature of the solution and the duration of treatment. Sulfur concentration in the film is related to the film density and thickness. An increase in the negative apparent adsorption heat of sulfur adsorption was observed with an increase of polyethylene films density. The estimated apparent sulfur diffusion coefficients in polyethylene increase with increasing temperature of the polythionic acid solution but decrease with growing crystallinity in the films. The concentration of sulfur in the film is limited by the stage of the acid decomposition, because the apparent activation energy of sulfur diffusion in polyethylene is nine to seventeen times lower than the energy needed for the polythionic acid decomposition. By treating polyethylene film sulfured inH2S33O6solution with copper( I-II) salt solution, copper sulfide (CuxS) layers are formed in the surface matrix of a polymer. The amount of copper in these layers is related to the density and thickness of the polyethylene film and the sulfuration conditions. The amount of copper increases with a decrease in the density of the polyethylene film and with an increase in the temperature ofH2S33O6 solution used and the duration of the treatment. Initially, dielectric polyethylene films after formation of copper sulfide layers in their surface matrix become electrical conductors. Samples of low density polyethylene with the layers of CuxS were the most conductive.