The temperature dependence of the contact angles θ(Т) of the polished surface of structural stainless steel 12Cr18Ni9Ti with liquid tin in the temperature range 510–920 К was established in experiments on an improved experimental setup using the sessile drop method under vacuum conditions. On the polytherm θ(T) of the studied system, a critical wetting temperature of about 870 K was found. According to the authors, the appearance of the critical temperature is mainly due to and associated with the onset of the processes of dissolution of alloying elements of 12Ch18Ni9Ti steel in liquid tin.

In the work for the formation of low-resistance gate electrodes of a field-effect transistor using refractory metals, a technology of self-displaced structures for GaAs-based circuits was developed and the structures of two-layer W/WSi_х gate electrodes were studied, and the thickness of the WSi_x layer was also optimized. This article shows that the combination of a two-layer W/WSi_х structure provides a low resistance to contacts and interconnects.

With varying levels of radiation dose, displacement on the substrate, and technological parameters, the characteristics of the outer layer, the static charge in the oxide, and the number of confined holes on both sides of the internal oxide layer were examined. Based on the amount of radiation absorbed, the voltage shift of transistors with a channel made by a latent oxide when exposed to X-rays was investigated. An assessment was made of the effect of X-ray radiation on the voltage shift for transistors with an oxide channel created by latent oxide during radiation, depending on the radiation dose. Additionally, an increase in radiation sensitivity is mirrored by a decrease in channel width. The study demonstrated that the protection from radiation of latent oxides significantly increases when a negative voltage is applied to the substrate during irradiation.

The most studied amorphous system is amorphous silicon; however, other amorphous systems, in particular oxides, have also found wide practical application. Their study as new materials for optoelectronics is topical. An important point in such studies is the establishment of the relationship between the real structure and the electrical properties of the amorphous oxide. This paper reports on the results of a study of the amorphous structure of thin films of complex transition metal oxides (oxide tungsten bronzes) Na_0,3WO₃, K_0,3WO₃, obtained at different substrate temperatures, and the mechanisms of electron transfer in them during heating and cooling in vacuum and subsequent heating and cooling in oxygen.

Studies of optical properties for the production of new organic liquid scintillators based on synthin («component-reagent»), where naphthalene with a concentration of up to 10 mg/ml was used as aromatic additives. At the same time, there is an increase in the luminescence output by more than 5.9 times. The results ob- tained will be used to create liquid scintillation detectors for the registration of neutrinoless double beta decay of neodymium-150.

We consider the Frankl-Moravec problem for a mixed hyperbolic-parabolic equation, which describes the flow inside the Laval nozzle. The proof of the existence and uniqueness of the solution of the problem is presented.

To study the dynamics of the temperature field, as well as for mathematical calculations and forecasting, a mathematical model is constructed in the form of a problem with phase transitions. New methods have been obtained for investigating the emerging one-dimensional problem with phase transitions under low- temperature exposure to biological tissues. The programs of the proposed computational algorithms based on the constructed mathematical models have been developed and numerical calculations on a computer have been carried out.

Dynamical interaction of an neutral cylindrical body moving parallel to the flat surface is considered. For the both of perpendicular and parallel orientation of nanotube dynamical frictional forces are much smaller than the static attractional one.

A complex of comenic acid with Cu(II) composition [Cu(H₂O)₂HA]Cl·2H₂O. The resulting complex was investigated by various physico-chemical methods of analysis. A quantum mechanical calculation was performed, with the help of which the dimeric structure of the complex was confirmed.

A complex of L-histidine with Zn(II) composition ZnLCl3 was synthesized. The obtained complex was studied by various physicochemical methods of analysis (13C-spectroscopy, NMR and X-ray diffraction).

Based on the analysis of all stages of the chain of evolution of a nanocomposite polymeric materials (NPM): development → production → processing → operation → utilization of the material, a number of environmental and economic conclusions have been made. It is shown that the development and commissioning of multifunctional NPM (HDPE + ultrafine metallic medium, UDS) with adaptive auto-stabilizing properties (increased set of initial properties and service life provided by environmentally friendly high-performance nano- modifiers) provides a significant environmental and economic gain in comparison with existing industrial grades.

Тhe processes of synthesis of new aromatic diketoximes for their use in reactions for the production of polyarylenepyrroles are investigated. A model compound was obtained by the heterocyclization reaction; optimal synthesis conditions were determined. The structures of the obtained substances have been confirmed.

Composite materials based on polybutylene terephthalate, polycarbonate and heterofunctional copolymers as their modifiers have been obtained. It has been established that the introduction of blockсopolyphenylenestersulfonepyrroleoxymate and blockсopolyphenylenestersulfoneketonepyrroleoxymate improves the physical and mechanical characteristics of polymeric materials composite.

The paper shows that reapet the reprocessing of composites based on polyetherketone and carbon fiber is accompanied by insignificant additional destruction of the fibrous filler, while it was found that the viscosity of the initial polymer matrix has practically no effect on the degree of fiber destruction. despite the difference in shear stresses.

It has been shown that connectivity degree of discontinuous chains of particulate filler in composites on the basis of polyamide-6 defines their main characteristics, for e [ample, reinforcement degree, elasticity modulus of filler, efficiency of filler as reinforcing element of structure. In its turn, the connectivity degree, which characterizes by spectral (fracton) dimension, is function of filler dispersity and its volume contents.

The quantitative estimation of effective elastic modulus of filler for composites on the base of polyamide 6 within two methods, which results shown close correspondence, was performed. The indicated elastic modulus is below essentially (about one order) its nominal value. The proposed method allows to avoid application of large number of correcting coefficients in the case of usage of the mixtures rule. The effective elastic modulus of filler is indicator of its efficiency as reinforcing element.

The results of a study of copolyetherketones based on hydroquinone and 1,1-dichloro-2,2-di (3,5-dibromo-4-hydroxyphenyl) ethylene by high-temperature polycondensation are presented. Various methods confirmed the composition and structure of polyetherketones. It has been shown that the introduction of Br atoms and a dichloroethylene group into macromolecules significantly affects the performance properties of polyetherketones.

The reaction of nucleophilic substitution in a high-boiling solvent produced copolyarylene ether ketones containing ether, keto, and ester bonds. The structure, structure and main properties of the synthesized polyarylene ether ketones have been studied. The structure of polymeric materials was confirmed by IR spectroscopy and turbidimetric titration. It has been shown that copolyetherketones can be widely used as highly heat-resistant structural and film polymeric materials.

The article provides information on polyarylene ethers – polysulfones and polyethersulfones, also presents the results of studies of thermal destruction processes, the kinetics of destruction, the effect of irradiation with electrons, protons, ions on their mechanical properties, etc.

Currently, biodegradable polymers are playing an increasingly important role in order to improve the environmental situation. Of these, polylactide (PLA) is considered as one of the most promising biodegradable plastics. Due to the peculiarities of this polymer, in particular its fragility, researchers are developing polymer compositions with the addition of plasticizing polymers, such a component can be polybutyleneadipateterephthalate (PBAT). After exposure to UV radiation with a wavelength of 254 nm for 100 hours on a mix- ture of PLA/PBAT found that due to the susceptibility of PLA to UV radiation, the destruction of the material occurs mainly in the polylactide matrix, while the thermophysical characteristics decrease. The diffractograms of the samples show reflexes characteristic of the crystalline α-form of polylactide. After ultraviolet irradiation, the intensity of reflexes decreases in 100PLA and in a blend of 70PLA / 30PBAT, which indicates the destruc- tion of the crystal structure of the polylactide.