The thermal and technological characteristics of carbon-filled compositions based on polyphenylene sulfide are investigated. It has been found that the identified low-molecular impurities are of raw material origin and do not significantly affect the thermal stability and rheological behavior of the studied carbon-filled compositions during processing by extrusion and injection molding. The thermal characteristics of carbon-filled compositions are significantly influenced by the chemical nature of the introduced technological and modifying additives.

The effect of nickel nanoparticles stabilized by a polyethylene matrix on the physical-mechanical and thermal properties of nanocomposites based on high-pressure polyethylene was studied by X-ray phase (XRD) and differential thermal (DTA) analyzes.

An improvement in the strength and deformation parameters, as well as the thermal-oxidative stability of the obtained nanocomposites was revealed, which can be attributed to the effects of structural modification of the polymer matrix.

Small amounts of nanofiller introduced into the polymer play the role of structure-forming agents - artificial nuclei of crystallization, which contributes to the formation of a small-spherolite structure in the polymer, characterized by improved physical, mechanical and thermal properties of the obtained nanocomposite.fi

For the first time, a quantum-chemical study of the reaction of protonation of the monomer of cationic polymerization of p-methylstyrene in the presence of a complex catalyst boron fluoride – water in toluene with a stoichiometric composition of 1:1:2 was carried out by the ab initio method with the reaction coordinate R_C1-H20. I t is shown that the value of the activation energy is 123 kJ/mol, and the thermal effect of the reaction is 86 kJ/mol. It has been proved that the interaction of the studied catalytic complex with p-methylstyrene in toluene of stoichiometric composition 1:1:2 is a coordinated process.

Experimental studies have been carried out to determine the technological parameters for the manufacture of polymer composite materials based on aramid fibers and polyurethane binders by wet winding and the effect of polyurethane binder compositions on the strength of aramid fibers in plastic.

The viscoelastic characteristics of materials based on ABS plastic and ABS/PC compounds depending on their composition have been studied by capillary viscometry; their effect on the characteristics of samples obtained by 3D printing by layer-by-layer surfacing has also been studied. A non-monotonic change in the effective viscosity depending on the composition of the compound is shown. It was found that the swelling coefficient in the range of shear rates implemented during printing for ABS/PC blends was higher than for the initial components, and the inlet pressure losses for the blends were minimal compared to the initial polymers. The mechanical characteristics in static bending increased with an increase in the content of PC in the ABS/PC blend.

This work was carried out to obtain a number of aromatic oligoetheramides and to evaluate the effect of their structure on mesomorphic and thermal properties. Oligoetheramides based on 4-aminobenzoic acid (4-ABA) were synthesized by hightemperature polycondensation. The structure of the obtained compounds was identified by IR spectroscopy, the thermal parameters were determined from the data of thermogravimetric analysis (TGA), the phase transition temperatures were determined by differential scanning calorimetry (DSC), and the manifestation of the optical activity of oligoetheramide solutions was studied by optical polarization microscopy (OPM). It was revealed that the samples dissolve when heated in sulfuric acid, in dimethylformamide (DMF), dimethylacetamide (DMAA) and have limited solubility in dimethylsulfoxide (DMSO). Solutions of oligomers exhibited optical activity at crossed microscope polarizers.

The surface-active properties (in aqueous solutions and water-hexane mixtures) of the amphiphilic sulfo-containing macromonomer 2-(acrylamido)dodecanesulfonic acid (AAС₁₂SА) were studied; copolymers of this surfomer with oligo(ethylene glycol)methacrylates were synthesized. Тhe effect of the content of sulfonic units in the obtained molecular brushes on their thermosensitive properties in water and water-salt solutions was determined.

Copolymers based on oligo(ethylene glycol) methacrylate, dodecyl methacrylate, and the cationic monomer N-methacryloylaminopropyl-N,N-dimethyl-N-propylammonium bromide have been obtained by reversible addition−fragmentation chain-transfer polymerization in high yields and in a controlled mode. The influence of the composition of the obtained polymers on the solubility in water and organic solvents, distribution in the water-octanol system, and interfacial tension at the water-oil interface is shown. The presence of thermoresponsive properties for polymers in water was found, and their aggregation in aqueous media was also studied.

The purpose of this work was to establish the relationship between the kinetics of the process of foaming polymer compositions with the kinetics of decomposition of the foaming agent and the viscosity of the foamed melts. The influence of the melt viscosity on the growth rate of the foaming coefficient of polyethylene compositions containing the foaming agent azodicarbonamide has been studied. Mathematical models are proposed that describe the kinetics of foaming polymer melts with different viscosities by blowing agents, which make it possible to optimize the technological parameters of their non-press and press foaming.

The article discusses the influence of gossypol azomethines on the antioxidant activity of polypropylene (PP) and the induction period of polymer oxidation. Thermostabilizing activity of the studied compounds during the thermal oxidation of PP was determined and the inhibiting groups that are involved in the inhibition of the thermal-oxidative degradation of the polymer at high temperatures were identified.

The possibility of obtaining antistatic and conductive composites based on an ethylene tetrafluoroethylene by introducing TUBALL single-wall carbon nanotubes deagglomerated in polyethylene wax has been established. The obtained antistatic composite (0.3–0.4 mass % of TUBALL nanotubes) has a set of mechanical characteristics sufficiently high for practical use as a structural material. This composite can be used in the development of products designed for use in extreme conditions in contact with chemically aggressive and flammable substances.

A composite sorbent based on chitosan and montmorillonite has been developed for the extraction of heavy metal ions from aqueous solutions. The optimal chitosan / montmorillonite ratio for obtaining sorbent granules has been determined. Equilibriumkinetic studies of the process of copper (II) ions extraction in the heterophase system "aqueous solution of metal sulphate - modified sorbent" have been carried out.

The treatment of sorption isotherms of copper (II) ions by the initial chitosan and a chitosan based composite according to the Langmuir equation made it possible to determine the maximum sorption capacities of these materials (А_∞). It has been established that A_∞ of the chitosan/montmorillonite composite sorbent exceeds the maximum sorption capacity for the original chitosan by more than two times.

The effect of pH on the sorption of copper ions by chitosan-based sorbents is due to the competition of metal cations and protons for sorption sites. In the course of competitive chemisorption, protons deactivate amino groups - the main sorption centers, converting them into an inactive, H-salt form, which leads to a decrease in the sorption capacity of chitosan in relation to copper ions.

Changes in the composition of the modified sorbent compared to the original chitosan are confirmed by infrared spectroscopy data. Microscopic studies using the method of scanning electron microscopy show the presence of changes in the surface structure of chitosan granules when montmorillonite is introduced into the composition of the sorbent.