The effect of diffusion processes on the formation of interfacial regions in nanocomposites based on styrene-butadiene rubber (SBR) was studied: SBR/carbon black (SBR/TU), SBR/microshungite, and SBR/nanoshungite. A theoretical analysis of the formation of interfacial regions in particulate-filled polymer nanocomposites has been carried out within the framework of the fractal and percolation concepts. A detailed quantitative description of the structure and properties of both interfacial regions and the nanocomposite as a whole is proposed.

The paper presents a modified density functional method using a multiparametric variational principle.

To study the possibility of applying the accuracy of this approach in the calculation of atomic characteristics.

The analysis of the dispersed composition of the photographic emulsion was carried out using atomic force and optical microscopes. The distribution curves of microcrystals by size at the stages of chemical and physical maturation of microcrystals are obtained.

In the frame of nonretarded additivity approximation an expressions for the dynamical Van-der-Waals forces, obtained for the geometry of a neutral nanoprobe in the form of cone with spherical apex moving parallel to a flat surface are presented. The results shows that frictional forces are much smaller than the static attractional one.

The introduction of biopolymers into production can have a strong positive impact on solving global environmental problems. In this paper, the ability of biopolymers to promote the formation of methane hydrates will be studied. The kinetics of the formation of methane hydrate in a high-pressure reactor without the use of mixing devices will be investigated by experimental methods. The growth rate and water to hydrate conversion for frozen dispersed solutions of biopolymers are estimated.

The sorption activity of pectin polysaccharides isolated from sunflower heads to uranium ions in the form of uranyl ions was studied under dynamic conditions. It has been established that the maximum sorption capacity of the sorbent based on pectin polysaccharides of the sunflower head. It can be concluded that the microgel based on pectin polysaccharides is able to absorb and retain uranium ions and there is a possibility of its practical application in order to reduce the concentration of uranium ions from mine waters.

The analysis of the effect of the number of layers of a PET-G (polyethylene terephthalate-glycol, PETG) polymer material formed during 3D-printing as well as determining the thickness of the sample on the optical property was performed. The optical property is determined by the value of the light transmittance at a wave- length of 650 nm. The material whose behavior is studied was processed using the additive FFF technology (Fused Filament Fabrication). The results obtained illustrate the existence of a relationship between the light transmittance and the thickness of the sample. A comparison is made between the optical transparency of PET-G processed by traditional technology (extrusion in a die with a flat slotted cross-section) as well as additive technology.

A two-stage linearization of experimental stress-strain dependences obtained under conditions of uniaxial tension of samples filled elastomers is considered. For a number of filled elastomers, regression equations that are linear in the entire region of sample deformation and their generalized form are obtained, which do not contain structural parameters and characteristics of loading conditions.

This paper presents the results of determining the strength and rheological parameters of fine-grained polymer concretes based on polyvinyl acetate dispersion and the prospects for their use for 3D-printing in construction. Based on a review of the literature, the properties of a mixture for additive technologies in construction are determined, the advantages of using polymer-cement compositions are given, and the thixotropy of mixtures containing a polymer component is experimentally shown. Polymer concretes, with many positive characteristics required for construction 3D-printing, tend to significantly reduce strength on the first days of hardening when replacing part of the cement with a polymer. This is a disadvantage but can be solved by introducing a polymer component into the composition without reducing the amount of cement.

The paper provides a review of studies that describe the properties of polyamide-6 and nanocomposites based on it. Shown are micrographs obtained by transmission electron microscopy (TEM), which can be used to judge the degree of nanosilicate distribution in the PA-6/organoclay composite. It is shown that the introduction of organoclay into the polyamide matrix leads to a decrease in the heat release rate. Thermogravimetric curves of nanocomposites based on polyamide-6 and montmorillonite modified with quaternary ammonium salts of various grades are presented. X-ray diffraction analysis of the initial polyamide, nanosilicate, and pol- ymer/silicate composition based on them was carried out.

A significant improvement in the technological and operational properties of compositions based on high-density polyethylene and oligosulfoketone has been shown.

The vulcanization and elastic-strength properties of rubbers containing additives based on blocked isocyanates have been studied: 2-isocyanato-4-phenylcarbamidotoluene, 2,4-diphenylcarbamidotoluene, modi- fied polyisocyanate. For rubber compounds with additives, there is a reduction in the scorch time (t_s) and the optimal vulcanization time (t₉₀), and there is no reversion time. It was found that with an increase in the content of additives from 0.4 to 0.8 wt.h, there is an increase in the conditional tensile strength with a simultaneous decrease in relative elongation, associated with an increase in the number of chemical cross-links formed dur- ing the interaction of blocked diisocyanates with rubber. For rubbers with additives, tear resistance increases – up to 60,3–100,9 kN/m, twice as compared to the control sample.

The flow curves of bituminous compositions modified with domestically produced styrene-butadiene thermoplastic elastomer (BSTEP) in combination with gray polymer are constructed and analyzed. Regularities of the joint influence of the BSTEP-sulfur modifier system on the rheological behavior of road bitumen materi- als are revealed. The rheological constants were determined: the consistency coefficient K and the flow index n at test temperatures of 40, 60 and 80 °C based on the approximation of experimental data according to the Ostwald de Waale equation. It was found that the process of temperature control of samples containing sulfur leads to an increase in the consistency index, which indicates the occurrence of structuring processes in the polymer-bitumen material.

The synthesis of bisetherimide resorcinol by the reaction of 4-chloro-N-methylphthalimide with resorcinol in the presence of potassium carbonate in DMSO was developed. The features of synthesis are discussed, as a result of which the reaction takes place in one stage, the final product is obtained with a high yield and purity.

The processes of polymerization of vinyl monomers in the presence of metal ions are considered. The study of the effect of ferrous ions on the polymerization of AA in the presence of AP showed that the introduction of a small amount of Fe²⁺ into the reaction mixture leads to a sharp increase in the polymerization rate in the initial period. By studying the influence of various factors on the polymerization process of methyl methacrylate in the presence of aminated polyphenylene ethyl, it was found that an increase in the reaction temperature and concentration of the polymer initiator and emulsifier, as well as with conventional radical emulsion polymerization, accelerates the pro- cess of emulsion polymerization. The processe proceeds as a first-order monomer reaction.

The resulting monomer is N,N-diallylaminobutanedioic acid and a polymer based on it. The structure of the monomer and polymer is confirmed by physicochemical methods. The toxic properties of poly-N,N- diallylaminobutanedioic acid were investigated on the Drosophila melanogaster test system. The results ob- tained allow us to conclude that poly-N,N-diallylaminobutanedioic acid in concentrations of 1 % does not have a toxic effect.

With the use of multiwalled carbon nanotubes functionalized with methyldiethanolamine (MDEA- MWCNT), a series of nanocomposite polyurethane foams was obtained. The effect of these additives on the morphology of the cellular structure and the change in the physical-mechanical characteristics of the synthesized foams was studied. It has been proven that the introduction of MDEA-MWCNT into the composition improves the physical-mechanical properties and increases the degree of order in the cellular structure of nanocomposite polyurethane foams.

Rhodium – and iridium-containing films based on the natural polymer of chitosan plasticized with glycerol have been obtained. In this work, a comprehensive analysis of the materials obtained by X-ray phase analysis (XRD), X-ray spectral analysis (XRD), scanning electron microscopy (SEM) was carried out, and the mechanical characteristics and biological properties (antibacterial and antiproliferative activity) of the obtained films were also studied. An analysis of the mechanical properties of the films showed that iridium-containing samples are character- ized by higher mechanical properties than rhodium-containing samples. Thus, we can conclude that the nature of the metal center affects the mechanical properties of the films. Iridium films have greater antibacterial activity than the corresponding rhodium films. The antiproliferative activity of the studied samples is due to the content of rhodium

(III) and iridium (IV) and is practically independent of the nature of the introduced metal cations.

The depolarization currents of multilayer polymer films of polydiphenylene phthalide were measured us- ing the method of thermally stimulated depolarization in the range from 170 to 373 K. Based on experimental data, the dependence of the temperature of the maximum position of the peak of the depolarization current, the charge released during heating of the sample and the activation energy of relaxation processes on the number of layers of the polymer film is shown. The value of the polarizing electric field strength was 8 х 10⁶ V/m. The rate of temperature change was 5 K/min. Two regions were detected on the depolarization current spectra. The first region is interpreted in the dipole charge approximation. The second area is explained by the presence of a wide distribution of traps occupied by injected charges.

New perfluorinated telomers have been obtained by radiation-induced telomerization of tetrafluoroethylene in Flutec PP3. The effect of the initial monomer concentration in Flutec PP3 on their properties was studied by IR spectroscopy and differential scanning calorimetry. It was shown that fragments of carbogal molecules are included in the composition of telomeres as end groups. It has been established that the thermophysical (temperatures and enthalpies of phase transitions and melting) and structural characteristics of telomers depend on the initial concentration of tetrafluoroethylene. Hydrophobic coatings of aluminobo- rosilicate glass fabric were obtained, the contact angles of which reach 147°.

Binders based on a mixture of epoxy oligomers modified with polyarylsulfones with controlled deformation strength properties have been developed. Using the stepwise curing mode, fiberglass and microplastics with increased tensile strength were obtained

In laboratory conditions, a comparison was made of methods for obtaining a polymer-bitumen binder PBB 60, obtained by mixing on the basis of an IKA homogenizer and the vortex layer method (ABC). We stud- ied the upper operating temperatures according to the PG (Performance Grade) classification, which are based on the Superpave methodology and make it possible to determine the shear stability by the rutting pa- rameters G*/sinδ and J_nr (MSCR test). The flow curves are constructed, with the help of which it is possible to describe the features of the rheological behavior of bituminous binders. It was suggested that in the ABC sam- ples, the degradation of the polymeric modifier in the bitumen binder occurs, leading to a decrease in its mo- lecular weight, along with a change in the structure of the original bitumen. Directions for further work are proposed in the direction of regulating the technological parameters of the vortex layer method in order to maintain the stability of the main characteristics of PMB, reduce molecular weight losses and ensure greater environmental friendliness and competitiveness of the technical and economic parameters of the bituminous binder manufacturing process.