Platov South Russian State Polytechnic University (Novocherkassk, Russia):

A. V. Khramenkova, Cand. Eng., Associate Prof., “General Chemistry and Technology of Silicates” Dept., e-mail: anna.vl7@yandex.ru
D. N. Ariskina, Student, “General Chemistry and Technology of Silicates” Dept., e-mail: ariskina.daria@mail.ru
E. A. Yatsenko, Dr. Eng., Prof., Head of “General Chemistry and Technology of Silicates” Dept., e-mail: e_yatsenko@mail.ru

The article presents a comparative analysis of those physicochemical properties of hybrid polymer-oxide materials on a solid support that depend on the polymer type. In the first case analyzed, a polymer of protein origin (gelatin) was used as the polymer matrix in the developed hybrid material, and in the second case, a synthetic polymer of polyvinyl pyrrolidone (PVP) was used. In both cases, hybrid polymer-oxide materials were formed on the surface of St3 steel with polarization by industrial frequency alternating asymmetric current. X-ray microanalysis has revealed that the qualitative elemental composition of the developed hybrid materials is the same in both cases and includes Co, Ni, Fe, Mo, C, O. Scanning electron microscopy has shown that the surface morphology of both gelatin- and PVPcontaining hybrid materials is sufficiently developed; it possesses block crack-like character and consists of individual fragments. The phase composition of the developed hybrid polymer-oxide materials, however, is somewhat different. Only molybdenum oxides (MoO₃, Mo₁₈O₅₂ and MoO₂) and cobalt, nickel and iron molybdates (CoMoO₄, NiMoO₄ and FeMoO₄) constitute the common phases. Yet, when gelatin is used as the polymer matrix, iron is present in the form of spinel (Fe₃O₄), and when PVP is used, iron is present in the form of iron (III) oxide (Fe₂O₃). Transition metals oxide compounds immobilization into polymer matrices is confirmed by IR spectroscopy. By analyzing the DSC-TG curves, high thermal stability of hybrid polymer-oxide materials in an oxidizing medium has been established. Hydrogen peroxide catalytic decomposition rate constant values comparison, calculated according to the first order reaction kinetic equation, indicated an increase in catalytic activity when polyvinyl pyrrolidone is used in comparison with in the hybrid materials containing gelatin. This may indicate the influence of polymer’s nature on the catalytic properties of the developed hybrid polymer-oxide materials.

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