The structural model of heat expansion of polymer nanocomposites, filled with 2D-nanofiller, using the fractal analysis notions was proposed. It has been shown that linear coefficient of thermal expansion of these materials depends linearly on reciprocal of the most general characteristic of polymer nanocomposites, namely, their reinforcement degree. This means, that the heat expansion of polymer nanocomposites is defined by two parameters – nanofiller content and structure of its aggregates in polymer matrix, characterizing by their fractal dimension, that makes this model maximally simple and clear from the physical point of view. Such approach to simulation allows quantitative description and prediction of heat expansion coefficient of polymer nanocomposites, that is very important from the practical point of view.

The results of the measurements of the volt-ampere and volt-estance characteristics for the changing nature of interaction between the amorphous thin films of complex tungsten oxides (tungsten oxide bronzes, TOB), as well as the monocrystals of TOB, and electromagnetic radiation have been presented. The nature of the al- teration of such interaction is determined by the temperature of the substrate at vacuum condensation in case of amorphous thin films and by the influence on the structure of the near-surface layer in case of monocrystals. The distinguishing from the general model of the physical processes occurring in the near-surface areas of the given oxides and on the boundary TOB – liquid electrolyte has been given.

In the work, measurements of samples of the liquid scintillator sintin for the content of the isotope ¹⁴C were carried out. The difficulty in measuring the pp neutrino flux and its spectrum using a detector based on a liquid organic scintillator is shown to depend largely on the content of the ¹⁴C isotope. The optical properties of a liquid organic scintillator have been studied, and chromatographic analysis has been performed.

The technology of printed circuit boards is the most common in modern electronic instrumentation. Manufacturing of microwave frequency range boards is based on foil composite materials, in particular, polytetrafluoroethylene. At the moment, there is no local production of such materials. Information about foreign manufacturing technology of this material and the influence of the filler on the characteristics of the composite material is closed. Therefore, an actual task is to search and study properties of composite materials for microwave applications with properties similar to foreign analogues.

A technique for forming CMIS structures has been devised, in which both types of field-effect transistors contain polysilicon gate electrodes doped with p⁺-doping. The pre-threshold and flow characteristics of fieldeffect transistors with a hidden n-channel and a gate made of p⁺-polysilicon were investigated, as well as the dependence of the drain current and dynamic conductivity on the channel length of field-effect transistors with a hidden n-channel. It is demonstrated that these devices have a lower threshold voltage as the thickness of the gate oxide is reduced from 17.5 to 11 nm, as well as an improvement in dynamic conductivity. It is demonstrated that the high values of effective electron mobility, saturation drain current, and dynamic mobility for field-effect transistors with a hidden n-channel and a gate made of p⁺-polysilicon are due to a decrease in electron scattering at the Si/SiO₂ interface, and a slight increase in the depth of the field peak in the structure of field-effect transistors reduces the rate of degradation under the influence of hot electrons injected through the Si/SiO₂ interface.

Based on the calculation of changes in the surface tension of a binary melt during the transition of a freshly formed surface from a nonequilibrium to an equilibrium state and a comparison of the adsorption of the surfactant component with the results obtained, a connection between them was established. Analysis of ex- perimental data on the study of surface tension isotherms shows that the established correlation between the indicated surface parameters is carried out with high accuracy for the entire range of compositions of binary solutions.

In this work, we calculated the adsorption of quasi-molecular formations in binary melts of solid solutions. The adsorption capacity of the quasi-molecular formations was shown, and it was found that the magnitude of adsorption and its sign depend on the size of the quasi-molecular formations and the value of the parameter F.

Van der Waals constants are considered within the framework of a modified model of dispersion interactions. Multipole constants for atoms of inert gases are calculated.

The classical radiative damping force for relativistic electrons passing through oriented crystals is studied theoretically. Expressions for the radiative change in the transverse energy and angular momentum are obtained, and their semiclassical generalizations are presented. Numerical calculations have been performed for energies of 150 GeV – 4 TeV for a germanium crystal.

It is shown for the first time that such processes as self-organization and self-assembly play an essential role in the formation of intermetallides, which help to organize into certain structures, minimize their energy and form stable metal compounds. The key role in the formation and stabilization of intermetallic compounds of the complementarity principle based on the atomic–molecular recognition of the "guest-host" components is also noted.

This article investigates the electrical properties of styrene-butadiene-styrene (SBS) plastic, samples from which are obtained using the FFF/FDM extrusion additive technology. Several 3D-printing modes are considered, based on a different combination of basic and variable 3D-printer settings. For all printed samples of SBS plastic, the value of the dielectric constant was determined, and a comparative analysis was performed. The results of this analysis made it possible to identify 3D-printing modes that provide the value of the dielectric constant closest to the values obtained for samples of SBS plastic made by traditional methods. At the end

Due to its physicochemical properties, collagen is a universal basis for hemostatic coatings. This study is aimed at obtaining hemostatic sponges based on fish scale collagen. To modify the properties of the collagen sponge, cellulose esters were introduced into the composition, which were previously used individually. A comparative study of the physicomechanical and operational properties of the obtained sponges was carried out.

The modification of petroleum road bitumen of the BND 70/100 brand was investigated, asphalt concrete mixtures (ABS) were obtained using porcelain stoneware waste as screening sands. Modifiers are copolymers of styrene with butadiene and ethylene with vinyl acetate, carbon nanotubes. Optimal concentrations have been determined for the production of ABS with increased heat resistance, elasticity, increased shear resistance and strength at temperatures from 0 to 50 °C.

The paper presents the results of experiments on the chemical and physical immobilization of porphyrins and their methyl derivatives in the matrix of polymers of various classes. Composite materials obtained by both methods of immobilization have antibacterial activity. Due to their bioactivity, such supramolecular porphyrinpolymer systems are promising for use in bioengineering and medicine.

To date, the problems associated with the storage of slag and other production waste have become more acute in the metallurgical industry. Some types of steelmaking waste have not yet been used. This paper presents the results of a study of the chemical composition, fineness, scanning electron microscopy and dielectric characteristics of both the original white slag and modified in a microwave electromagnetic field or as a result of short-term high-temperature exposure to high-frequency currents. With the introduction of both the original and microwave and high-frequency treated white slag into the epoxy compound, an improvement in the physical and mechanical properties and heat resistance of the filled epoxy polymer is observed, which indicates the expediency of using this waste from metallurgical production to create new polymer composite materials.

Syntheses of polyethylene terephthalate were carried out using tetrabutoxytitanium as a catalyst. The catalytic activity of the titanium catalyst has been studied and the properties of the obtained polymeric materials have been studied.

The paper briefly discusses a global practice in analysis of facilities faults related to materials. It investigates the VNIIA five-years-long expertise in analysis of the electronics faults pertinent to polymer materials. Incidents are classified with respect to tackled problems (fault types), obtained results, exploited techniques of instrumental analysis and analyzed materials. Actual problems solved by means of spectral and thermal analysis are described. Statistics of investigated materials is cited. The paper gives an example of strategy to address a particular problem.

The results of studies on the curing of 1,3-dinitrile oxide-2,4,6-triethylbenzole (TON-2) binders based on polymers with high unsaturated content are presented. It is shown that the crosslinking rate, survivability time and gelation are similar for butadiene, acrylonitrile, tetrazole polymers and copolymers. Methods for regulating the technological characteristics of binders and compositions using molecular complexes and TON-2 co- crystallizers are proposed.

The possibility of the introduction of perfluorooctene-1 into polymethylhydrosiloxane by hydrosilylation reaction as well as the synthesis of cross-linked copolymers polydecylmethylsiloxane-polyperfluorooctylmethylsiloxane (PDec-PFOMS) was confirmed for the first time. The quantitative substitution of the Si-H bond in PDec-PFOMS was determined from NMR data. Thermal properties and surface tension against water and n- butanol were investigated. It is shown that an increase in the content of fluorine-containing groups leads to an increase in the wetting angle for n-butanol.

The paper presents the results of studies of polymer clay nanocomposite for flexible packaging materials. The inclusion of polymer clay nanocomposite in the composition of multilayer materials leads to a decrease in the oxygen gas transmission rate. The use of polymer clay nanocomposite in film laminates increases their tensile strength and weld strength.

It has been shown that the anisotropy degree of filler in polymer matrix, essentially influencing on composites properties, is structural factor. This factor is defined by composite components affinity within the frameworks of fractal analysis. The composite components affinity defines unequivocally such important properties of these materials as, by example, the filler efficiency as reinforcing element, its real elastic modulus and another things. The number of methods was proposed, allowing to change purposefully anisotropy degree in process of composites preparation.

Polymer composite materials (PMC) based on low molecular weight siloxane rubber have been developed, which are supposed to be used as osteoplastic materials in maxillofacial surgery. Research is aimed at identifying the catalytic system and determining the optimal ratio of the structuring agent for silicone rubber. Work is also underway to determine the toxicological characteristics of the developed polymer compositions and their biocompatibility.