ON COMPLEXATION IN PROCESS OF CHEMICAL COPPER PLATING FROM SOLUTIONS CONTAINING POLYVINYLPYRROLIDONE

A formation of multifunctional composite coatings with a copper matrix by chemical vapor deposition is an effective method of modifying the surface of metals and non-metals and the increase in the deposition rate of coatings. It is important that the copper complex compounds are formed during chemical vapor deposition coatings and are included in the coatings composition. During the work by methods of thermogravimetric analysis and IR spectroscopy the composite coatings with copper matrix obtained from solutions containing copper sulphate and polyvinylpyrrolidone were studied. The results of thermogravimetry and IR spectroscopy of these components were presented. Samples of composite coatings for IR spectroscopy were obtained as a suspension of the coatings in vaseline oil. Deposited coating was scraped off from the substrate, and then was triturated in an agate mortar with vaseline oil until they formed a stable not stratified suspension. These suspensions were analyzed. The samples for thermogravimetry containing copper sulfate and polyvinylpyrrolidone were obtained by mixing these components. The following proofs of interaction in polyvinylpyrrolidone - copper sulphate system with forming a complex of polyvinylpyrrolidone - copper and includings of this complex into the coating were obtained. The differences of thermogravimetric curves of the mixture CuSO4 5H2O and polyvinylpyrrolidone were established. They are softening temperature increasing in the polymer material on 30 ... 35 °С towards to the softening temperature of polyvinylpyrrolidone, the appearance of the endothermic process, probably associated with the interaction of the polyvinylpyrrolidone with the copper, and the increase in the thermal stability of the polymer component of the system on 50-60 °С, which can be also with the result of complexation of polyvinylpyrrolidone - copper. The estimated structure of this complex, which reflects the results of the IR-spectrogram of the composite coatings analysis was presented. The IR spectra have absorption bands with wave numbers corresponding to the stretching vibrations of C-H bonds in the aromatic ring of polyvinylpyrrolidone, the stretching vibrations of the group – CH2 - and C-N bonds, which are also typical for the polyvinylpyrrolidone. This indicates the presence of polyvinylpyrrolidone in the coating or in its complex compound. In the spectra of the coatings the absorption bands in the range of 1750-1250 cm-1 are presented, which correspond to the stretching vibrations of C=O in the aromatic part of polyvinylpyrrolidone compound, in particular, in the group -CONHR, but they are shifted on about 50 cm-1 with respect to the same bands in the spectra of polyvinylpyrrolidone solution. Such shift is typical for the complex compounds of polyvinylpyrrolidone - copper which caused the C=O bond deformation, which occurs during the formation of additional bond of oxygen and copper atoms: C=O ∙∙∙ Cu, and indicates the presence of such complexes in a coating.Forcitation:Serbinovskiy M.Yu., Vasil'yeva N.A., Popova O.V. On complexation in process of chemical copper plating from solutions containing polyvinylpyrrolidone. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 26-32.