Dodecathionic acid as precursor for formation of semiconducting and conducting layers on the surface of polyamide 6

By a study of IR and UV absorption spectra it is shown that the dodecathionate anions, S(12)O(6)(2-), are sorbed-diffused into a polyamide 6 films if they are treated with the 4.10(-3) mol.dm(-3) water solution of dodecathionic acid, H(2)S(12)O(6), at the temperatures of 10 degrees C-40 degrees C. The values of sulfur concentration obtained in polyamide 6 (up to similar to 11 mmol.cm(-3)) are significantly higher than those, obtained in the studies in which the sorption of pentathionate ions from the K(2)S(5)O(6) solution or from 2.10(-3) mol.dm(-3) water solution of dodecathionic acid, H(2)S(12)O(6), by PA films has been studied. The concentration of sorbed dodecathionate ions increases with the increase of time of treatment, concentration and temperature of a H(2)S(12)O(6) solution. The copper sulfide, Cu(x)S, layers are formed in the surface of polyamide 6 film if the sulfurized polymer is treated with a solution of Cu(II/I) salt at 80 degrees C temperature: the anionic particles S(12)O(6)(2-) containing sulfur atoms of low oxidation state react with the copper ions. The conditions of a polymer initial sulfurization determine the concentration of copper and the composition of sulfide layer: the concentration of copper in the polyamide 6 film increases with the increase of time and temperature of initial sulfurization, and varies from similar to 0.5 mmol.cm(-3) to similar to 3.0 mmol.cm(-3); the stoichiometrical composition of Cu(x)S layers on polyamide 6 formed according the data of chemical analysis varies from Cu(similar to 0.3)S to Cu(similar to 1.0)S. The regularities determined enable formation by sorption-diffusion method of electrically conductive (similar to 60 Omega/square similar to 1.0 Omega/square) copper sulfide layers using the solution of dodecathionic acid as a polyamide 6 sulfurization agent.