A thermal protective polymer coating was created using polyether urethane rubber with epoxy-urethane end groups, chlorine-containing epoxy oligomers cured by a mixture of aromatic amines, resorcinol, and melamine polyphosphate as a filler. The structure and properties of the coating were studied.

Polymer composite materials based on ethylene–vinyl-acetate copolymer modified with various petroleum polymer resins applied to steel substrates were investigated. In the process of measuring the surface-energy characteristics by wetting with test liquids and calculating them using the Owens–Wendt and Van Oss–Chaudhury–Good equations, it was found that modification with resins increases the acidic (according to Lewis) properties of compositions—the free surface energy’s acid–base component and the acid parameter. The cathodic disbondment method was used to estimate the adhesive strength of modified coatings on steel, which agrees with the defect diameter in the coating after an 8-h experiment. Experimental results obtained in this work are confirmed by theoretical calculations, as a result of which the dependences were found between the defect diameter after cathodic disbondment and such surface-energy characteristics as the acid–base component of the free surface energy of polymer composites, the reduced acidity parameter, and the thermodynamic work of adhesion. Dependences obtained have a decreasing exponential nature. Based on the conducted research, a conclusion was made about the correspondence of the adhesive strength of modified polymer coatings on steel assessed under cathodic polarization conditions, as well as the thermodynamic characteristics of the materials being joined.

Using polyurethane ureas as a basis for protective coatings materials with high wear resistance and strength margin can be prepared. It has been shown that cycloaliphatic diisocyanates, such as 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate and 4,4'-diisocyanatodicyclohexylmethane, impart transparency to polyurethane urea-based coatings due to formation of a single-phase structure. The possibility of optimizing the content of antifogging surfactants in these coatings has been investigated.

The paper considers the influence of annealing temperature on the properties of low-carbon powder steel. It is shown that, after high-temperature annealing, a significant amount of defects are eliminated, both ductility and strength increase, and the properties of powder steels become comparable to the properties of conventional steels. The effect of holding time and annealing temperature on the properties of low-carbon powder steel is considered. A noticeable improvement in the properties is observed after annealing for 60 min. It is shown that rapid cooling after hot stamping ensures the formation of a supersaturated solid solution, and so hardening is not a mandatory operation for such materials.

The paper presents the kinetic data on the curing of an epoxy oligomer with an amine curing agent in terms of dielectric constant in comparison with shrinkage processes and residual stresses build-up. It was shown that the kinetic data on the curing of the ED-20 + TETA system obtained by different methods (dielectric constant, shrinkage, and residual stresses) allow one to evaluate the course of chemical reaction only in the kinetic region and practically do not cover the diffusion region. It was found that the kinetic data obtained for the curing of the ED-20 + TETA system in terms of dielectric constant and volume shrinkage correlate well with each other. The time lag of residual stresses build-up compared to dielectric constant and volume shrinkage indicates the coupling of these processes and their relaxation nature. To reduce the level of residual stresses in the diffusion region (from 11 to 22 h) in the technological curing process of the ED-20 + TETA system it is necessary to use heat treatment with temperature rise up to 80–100°C, increasing the rate of relaxation processes with almost constant volume shrinkage.

Research works on the development of urethane-forming compositions and carbon- and glass-fiber-reinforced plastics based on them obtained by vacuum infusion are continued. A laboratory thermovacuum infusion unit is created. Prototype samples of such composites are obtained and tested. Correlations between the qualitative indicators (viscosity, hydroxyl number (HN)) of component A in polyurethane (PU) binders and between the HN and physical and mechanical indicators of cured binders are found. It is shown that the dependences of the strength and Young modulus of PU films increase with increasing values of the HN and have an exponential and polynomial character of the dependence. An attempt is made to find explanations for the observed phenomena. It is found that the same regularities are observed on the composites as on PU films: the physical and mechanical indicators of carbon- and glass-fiber-reinforced plastics increase with an increase in the values of the HN.

The influence of test temperature, aging, and modification of bitumen PG58-28 with active powder of discretely devulcanized rubber on damage accumulation rate curves; fatigue parameters Nf, FREI, and F; and postpeak slope of the τ(γ) curve is analyzed on the basis of processing of experimental data of the linear amplitude sweep test using three models based on the VECD theory, five destruction (failure) criteria, and two variants of calculating the α parameter (19 variants in total). It is shown that, at small deformations, parameter Nf decreases with decreasing temperature, but increases after operational aging, while parameters FREI and F change in the same direction with aging and decreasing test temperature—parameter F increases, and parameter FREI decreases. The modification resulted in a decrease in F, an increase in FREI, and a decrease in the slope of the F and FREI curves versus temperature, as well as a decrease in the postpeak slope of the τ(γ) curve.

This paper reviews the results of research in the field of photopolymerization of cyanoacrylate monomers and compositions based on them. Various methods and mechanisms of photopolymerization are considered. Examples are provided to illustrate the use of photopolymerization processes in various fields of engineering and medicine.

The article summarizes data from literary sources on the use of wheat and rice grain hulls as sorption materials for eliminating hydrocarbon spills from water surfaces. Brief information on the composition of the hulls and their formation volumes is provided. It is shown that grain crop hulls are a common, high-tonnage, effective, and cheap sorption material for removing oil and its by-products from water surfaces. It is shown that the sorption characteristics of these materials for oil and its by-products can be increased by modifying them with various chemical reagents and using physicochemical methods.

The article considers some possibilities of creating new fire-resistant copolymers based on allyl monomers and quaternary phosphonium salts. Kinetic regularities and mechanisms of the copolymerization process are revealed. The study of the fire-protective characteristics of the copolymers showed that they are fire-resistant.