Studies on Application as Precursor of Selenotrithionate and the Mechanism of Seleniumization Polyamide 6 Films

Abstract

Using of UV, VIS and IR absorption spectra it is shown that the selenotrihionate anions (Se(SO3)22–) are sorbed-diffused into a polyamide 6 films if they are treated with the solution (0.05 mol⋅dm–3) potassium selenotrithionate K2Se(SO3)2 in 0.1 mol⋅dm–3 HCl at 60 °C up to 4.0 h. The study of UV, VIS and IR absorption spectra and the chemical analyzes of polyamide 6 films treated with solution of potassium selenotrithionate have proved that sorbed Se(SO3)22– anions decompose in polymer with time. It is also determined selenium containing anions remained in polyamide 6 but sulphur contained anions were washed out. The concentration of sorbed-diffused selenotrithionate ions increases with the increase in duration of treatment up to 1.5 h when the decomposition of sorbed-diffused anions begun. The atomic force microscopy (AFM) images of polyamide 6 film show that the surface of polymer is covered with the separate island of selenium when selenization time of polyamide 6 is 1.5 h. With the longer selenization time the island of selenium spread denser on surface of polyamide 6. The copper selenide, CuxSe, layers are formed in the surface of polyamide 6 film if the selenized polymer is treated with Cu(I–II) salt solution (10 min, 80 °C): the anionic particles Se(SO3)22– and its decomposition products containing selenium atoms of low oxidation state react with the copper(I–II) ions. The X-ray diffraction analysis confirmed the formation of copper selenide layers in the surface of polyamide 6. Three phases – CuSe2, Cu2–xSe and Cu2Se were identified in the copper selenide layers by XRD analysis. The modified polymer from dielectric become electroconductive (56.8 Ω/???? – 135.0 Ω/????).