The effect of impurities and electric transfer on phase formation and kinetics of the contact melting process in the Bi – (Sn + 3 at) system has been established by X-ray photoelectron spectroscopy. % In). No chemical compounds were found between Bi and In. The stages of the formation of the liquid phase during contact melting have been confirmed. It is shown that the decelerating direction of the current "stopped" the formation and growth of the contact area on the Bi side. An increase in the concentration of In (more than 2 times) in the near-contact region of pure Bi was found compared with the concentration contained in the contacted solid solution (Sn+3at% In), which is characteristic of the shockless and decelerating versions of the experiments.

The relationship between the main thermodynamic parameters of the state of polymers is determined by the equation of state. The paper considers a modified van der Waals equation. The values of the parameters included in this equation are given for some polymers. The dependence of the specific polymer volume on temperature for amorphous (non-crystallizing), crystalline, and amorphous-crystalline polymers has been determined.

The article describes the development and creation of a scintillation gamma-ray spectrometer based on a single crystal NaI(Tl), with a diameter and height of 200×200 mm, with an extremely low intrinsic radioactive background, including the manufacture of a batch of such spectrometers. In this work, their spectrometric and background characteristics are studied, including in low-background conditions of the underground laboratory of the Baksan Neutrino Observatory located in the CBD.

All components of gamma-ray spectrometers were selected from the point of view of the content of radioactive impurities, for which a low-background semiconductor detector was used.

With an increase in the degree of integration and a decrease in the size of VLSI elements, the problems of creating contacts and interconnects to ultrafine structures cannot be solved using only metal films – the requirements for ensuring the thermal stability of materials used as contacts and interconnects increase. Refractory metal silicides are promising materials for use in metallization systems. In order to evaluate the thermal stability of silicides, we studied the change in the Si/metal atomic ratio in films of silicides of refractory metals W, Mo, and Ta subjected to annealing in an inert gas and thermal oxidation. It is shown that, as a result of heat treatment, the thickness of silicon-enriched films decreases, while that of metal-enriched films increases. Heat treatment of TaSix, WSiy, and MoSiz films on silicon substrates leads to equilibrium values of the parameters: x = y = 2,2, z = 2,1, which remain irrespective of the nature of the annealing environment.

The effect of mechanomagnetic activation (MMA) of superplasticizer C-3 solutions used for cement slurry mixing on the structure and properties of cement composite has been studied. The method of dynamic light scattering revealed the appearance of nanosized particles of the dispersed phase of the mixing fluid. On the basis of data of thermogravimetric and X-ray phase analysis the changes in the structure of cement paste have been found, the role of ММА in structure-forming processes has been established and the main cement paste structure components have been determined.

The distribution of adsorption sites with persect to the acid–base type and intensity on the surface of urethane rubbers was studied by the indicator method with spectrophotometric determination of the amount of sites. Acid–base sites capable to act as active sites of adhesion interaction on the polymer surfaces were determined. All the surfaces studied are bifunctional and contain both base and acid sites, with the acid sites prevailing. The aqueous medium influences the activity of some of the revealed sites of the Brønsted: base site (C-O-C) and one of the acid sites (NН). The results obtained can serve as a basis for understanding the mechanism of adhesion interaction on the interface.

The dynamic viscosity of solutions of polymer matrices based on hyaluronic acid with the addition of diflunisal and tafamidis was investigated. The drug release from the polymer matrix was studied at different concentrations of diflunisal and tafamidis.

The results of a theoretical analysis of the factors influencing the quality of mechanical processing of polymer composite materials (PCM) are presented. On the example of mechanical treatment of basalt plastics with a tool made of high-speed steel, the influence of cutting modes and the use of lubricating fluid on the quality of the cutting surface has been demonstrated. On the basis of the mathematical apparatus of linear programming, a model was developed for choosing the optimal technological process for machining PCM.

The paper presents the results of a study of the optical and luminescent properties of a scintillator based on the industrial product sintin with additives. The optimal composition of the scintillator for the sintin solution has been determined. It is expected that the optimization results will be used in the development of a high-mass scintillation detector. The studies were carried out using a PE-3000 UV spectrophotometer and a PerkinElmer LS 55 luminescent spectrometer.

The paper presents the results of research on the production of new complex compounds of neodymium with polyelectrolyte-guanidine polymethacrylate, for the creation of liquid organic scintillators. The analysis of the composition and structure of synthesized complex compounds has been confirmed using modern physico-chemical methods. It is established that the formation of the complex occurs due to the interaction of neodymium ions with the oxygen atom of the carboxylate ion and the nitrogen atom of the amine group in a water-soluble polyelectrolyte.

The processes and mechanism of the unusual course of the radical polymerization process in the reactions of the interaction of N,N-dimethylaminoethylmethacrylate with benzenesulfonic acid, p-toluene sulfonic acid, sulfocationite and other compounds are considered. It is shown that in the considered systems, the polymerization reaction proceeds spontaneously – through the quantification reaction of monomeric amine with aromatic halide compounds at temperatures of 20–50 °C in various states (in mass, solution). The methods of elemental analysis, IR, PMR spectroscopy have shown that the high-molecular products formed as a result of the polymerization process correspond in composition and structure to polymer protonated salts.

A study has been conducted in the synthesis of soluble, thermo- and flame-resistant polyethyrphthalimides based on bis(p-aminophenoxy)ariylenes and bis(phthalic anhydrides). The main ways of obtaining polyethyrphthalimides are considered – by the interaction of bis(p-aminophenoxy) ariylenes with bis(etherophthalic anhydrides) using a polycyclocondensation reaction. The effectiveness of the use of bis(p-aminophenoxy) is shownariylenes containing two simple ether bonds in the initial ones, it was found that the obtained polymers have sufficiently large temperature ranges of softening and active destruction. The interrelation of their structure and properties has been established. The influence of dichloroethylene, carbonyl and simple ether groups between the phenyl nuclei of central fragments of macromolecules on the solubility, thermal and strength properties of synthesized polymers has been studied.

Polyurethane-polyalkylene oxide block copolymers containing fragments of an adduct capable of reversible chemical transformations by the Diels-Alder reaction have been synthesized and studied for the first time. All obtained compounds were characterized by IR spectroscopy, and viscometry. The temperature transitions and thermal stability of block copolymer melts were determined by using the methods of differential scanning calorimetry and thermogravimetric analysis. The self-healing effect was confirmed using the thermal cycling procedure, which was subjected to pre-damaged samples of modified polyurethanes, and the "sol-gel" method. The perspective of the work begun on the creation of self-healing protective polyurethane coatings are shown.

The variety of skin diseases determines the importance of numerous works on the creation of new materials, including wound coatings. Significant success has been achieved with hydrogel dressings containing biologically active molecules intended for wounds of varying severity. The aim of this work was to obtain free-radical polymerization of taxifolin-containing hydrogels based on acrylic and collagen as the basis for a wound dressing. The influence of synthesis parameters on the gelation time, sorption kinetics based on a pseudo-second order model and a mathematical model, as well as the drug release of the obtained samples based on the Korsmeyer – Peppas, Higuchi, Bake – Lonsdale and Hixon – Crowell models, respectively. The experimental data about taxifolin release in phosphate buffer solution were obtained.

The paper presents a study of the influence of the modification of epoxy resin with carbon nanotubes on the volume chemical shrinkage after the gel point. On the basis of the obtained experimental data and model dependences the change of volume shrinkage value during curing of epoxy binder is demonstrated.

Currently, polylactide (PLA) and PLA composites are of growing interest as new promising materials for the industry and agriculture using. The main process that occurs during the PLA photodegradation is the accidental splitting of the chain by the Norrish II mechanism. Photodegradation causes changes in mechanical properties, thermophysical characteristics. The melting point of PLA after exposure to UV radiation (λ = 254 nm) for 50 hours decreases by 5 °C, and the degree of crystallinity decreases by 3–4 %. The disintegration of the PLA/NR material is confirmed by IR spectroscopy.

The influence of HCl and H₂O concentration on the size of titanium dioxide particles formed in isopropyl alcohol medium from tetraisopropoxide using sol-gel technology was investigated. It was found that the dependence has an extreme character. The doping of TiO₂ particles ~ 50 nm in size by gold nanoparticles obtained by UV reduction of HAuCl₄ in solutions of the polymer stabilizer – chitosan was performed. The developed TiO₂/Auchitosan systems have high photocatalytic activity in a wide range of wavelengths, which is confirmed by the decomposition of methylene orange by 80–90 % in aqueous solution.