Layers Using Dodecationic Acid

By a study of IR and UV absorption spectra it is shown that the dodecathionate anions are sorbed-diffused into a polyamide 6 films if they are treated with the water solution (0.002 mol⋅dm–3, 20 °C – 50 °C) of dodecathionic acid, H2S12O6. The values of sulfur concentration obtained in polyamide 6 (up to ∼250 mg⋅g–1) are significantly higher than those obtained in the studies in which the sorption of lower polythionates – trithionate, S3O62–, tetrathionate, S4O62–, and pentathionate, S5O62–, – by polyamide 6 films has been studied. The concentration of sorbed dodecathionate ions increases with the increase of duration of treatment and temperature of a H2S12O6 solution. The thallium sulfide, TlxS, layers are formed in the surface of polyamide 6 film if the sulfured polymer is treated with alkalified (0.015 mol⋅dm–3 NaOH) 0.1 mol·dm–3 solution of Tl2SO4 at 80 °C temperature: the anionic particles S12O62 – containing sulfur atoms of low oxidation state react with the Tl(I) ions. The conditions of a polymer initial sulfuration determine the amount of thallium and the composition of sulfide layer: the amount of thallium in the polyamide 6 film increases with the increase of duration and temperature of initial sulfuration, and varies from ∼25 mg·cm–2 to ∼250 mg·cm–2; the stoichiometrical composition of TlxS layers on polyamide 6 formed according the data of chemical analysis varies from ∼Tl0.15S to Tl1.2S. The results of X-ray structural analysis confirmed the formation of thallium sulfide layers in the surface of polyamide 6. The phase composition of layer changes depending on the conditions of initial treatment in a H2S12O6 solution too. Four thallium sulfide phases, TlS, Tl2S2, Tl4S3 and Tl2S5 were identified in the composition of the layers by X-ray diffractio