The rheological, rheokinetic, structural and damping properties of casting compounds based on mixtures of plasticized PVA with epoxy oligomers have been investigated. It was found that in the process of epoxy oligomer curing phase separation of components in the mixture occurs with the formation of heterogeneous structure with ultra-high dissipative properties in the low frequency region and temperature range from minus 5°С to plus 25°С which provides highly eff ective damping in metal structures containing internal narrow cavities.

   The properties of plasticized electrically conductive polymer materials based on syndiotactic 1,2-polybutadiene containing nanosized carbon as a fi ller have been studied. The infl uence of the content of carbon fi ller and plasticizing additives on the properties of polymer composites is considered: electrical conductivity, polymer melt fl uidity, glass transition and melting parameters, physical and mechanical characteristics. The conditions for processing electrically conductive polymer compounds from the melt by extrusion or 3D printing were determined. Samples of elastic conductive materials have been obtained that can be used as mechanosensors and elements of electrical circuits.

   The physical and mechanical properties of acrylonitrile-styrene-acrylate (ASA) samples made by additive manufacturing have been investigated in this work. The influence of the filling degree (30 %, 60 %, 80 % and 100 %) on hardness, density and mechanical properties has been studied. It was found that the Shore D hardness remains constant at the degree of fi lling from 30 % to 80 and increases by about 8 % at 100 % filling. The density of parts increases monotonically with increasing degree of filling, reaching a maximum at 100 % filling. Three-point bending tests showed the highest values of strength and modulus of elasticity at 100 % fill. The tensile strength of specimens with small cross-section increases significantly at 80 % to 100 % filling (by about 43 % and 76 %), whereas for specimens with large cross-section this parameter is practically independent of the filling degree. The elongation of the specimens increases with increasing filling, reaching a maximum at 100 % filling. The results show that the degree of filling and specimen geometry have a signifi cant effect on mechanical properties, which allows us to optimize 3D printing parameters to create products with specified characteristics.

   The results of experimental study of comparative efficiency of vibrational energy dissipation in materials of metal-polymer-metal (M–P–M) layered structure with different thickness of polymer layer are presented. It is shown that if the thickness of the polymer layer is significantly less than the thickness of the metal layer, it has little effect on the efficiency of energy dissipation in M–P–M structures. In addition, the vibration-absorbing film VPS-2.5 demonstrates high dissipation of vibrational energy in M–P–M structures in the frequency ranges from 1 to 6000 Hz, including low frequencies (f ≤ 200 Hz) even at a thickness of 0.2 mm.

   The effect of PSF-180 polysulfone on the impact strength of ED-20 epoxy resin in the temperature range from plus 20 °C to minus 60 °C. A system with a phase structure containing a continuous thermoplastic phase makes a significant contribution to increasing the impact strength of the modified matrix. It has been shown that polysulfone-modified epoxy resin has increased impact strength and maintains an advantage over unmodified one over the entire test temperature range.

   The mechanism of initiation of cationic polymerization of isobutylene in the presence of an water complex of aluminum chloride in toluene has been studied using the classical quantum-chemical DFT method. It has been shown to be a concerted process. The values of the activation energy and the energy of the thermal eff ect of the reaction under study (105 kJ/mol and 22 kJ/mol) were
obtained.

   A methodology for solving optimization problems for complex physical and chemical processes occurring via the free-radical copolymerization mechanism has been developed. The proposed approach is based on the use of a genetic algorithm capable of identifying global optima when working with large search spaces and complex objective functions. A kinetic modeling approach is used to describe the process mathematically, facilitating rapid empirical evaluation of average molecular characteristics. The validation of this approach was carried out to solve the problem of finding the optimal method for feeding the regulator in the process of obtaining SKS-30ARK rubber. Based on the results of the computational experiments, conditions were established that make it possible to maintain the specifi ed relaxation characteristics of the product with an increase in monomer conversion up to 80 %.

   The flow and heat transfer of a non-Newtonian fluid in a converging channel is investigated. The main assumptions in the formulation of the problem were made based on the low value of the Reynolds number and the high value of the Peclet number. The Ellis model with viscosity depending on the temperature and degree of dispersion of the filler is used as a rheological model. Highly viscous media are considered, therefore the dissipative term is taken into account in the energy equation. Thermal boundary conditions of the first kind are used. Variable viscosity has a noticeable eff ect on the temperature, stress and velocity fields along the length of the channel. The proposed model provided the basis for an engineering method for calculating the optimal height of the dispersing gap. The problem is solved by the numerical finite difference method using iterations.

   A methodology for modifi cation of epoxy resin with liquid products of plant waste pyrolysis is proposed, including methods for preliminary preparation of pyrolysis liquid, its purification and methods for introducing it into epoxy resins. An optimal concentration of the hardener in the epoxy composition is recommended and a heat treatment mode is developed based on the stability of the obtained strength properties. The effectiveness of the proposed methodology is demonstrated based on the analysis of the strength characteristics of epoxy compositions modified with three types of pyrolysis liquid.

   This review summarizes the literature data on the use of water-soluble ammonium-containing ionene flocculants for water purification from dyes (including in compositions with coagulants). The influence of the type of dyes, the molecular weight of ionenes, their concentration, the pH of solutions, and other parameters on the purifi cation efficiency is considered.

   A composite material based on high-density polyethylene modified with amorphous boron has been developed. The results of physicomechanical and rheological studies of the developed material are presented. The influence of amorphous boron concentration in the polymer composite material on radiation resistance has been studied. It is shown that as the concentration of amorphous boron in polyethylene increases, the amount of absorbed neutrons increases and the neutron flux density decreases.

   The article is devoted to the study of qualitative parameters of turning workpieces made of thermosetting polymer materials. Turning of the materials under study is carried out in combination with preliminary surface deformation of the workpieces by rolling. It has been experimentally proven that the implementation of advanced surface deformation of the material of workpieces made of thermoset plastics ensures an increase in the quality of the surface processed by turning. This is evidenced by the values of the geometric parameters of roughness and deviation of the shapes of the processed surface.

   The results of studies and changes in the molecular weight and thermal properties of the thermoplastic copolymer of microbiological origin 3-hydroxybutyrate-co-3-hydroxyvalerate P(3HB-co-3HV) in a multi-stage process, including repeated melting of the copolymer to obtain pellets, extrusion production of filaments and 3D printing itself, are presented. In the process of obtaining granulate, filaments and FDM 3D printing of three-dimensional samples, a minor change in temperature characteristics was recorded, including melting and thermal destruction temperatures, crystallization and glass transition, as well as a noticeable decrease in molecular weight (by 35 %). The recorded changes in the molecular weight and temperature characteristics of the P(3HB-co-3HV) copolymer during processing made it possible to obtain fi laments for 3D printing and print 3D samples whose parameters correspond to those for bone-plastic materials and products.