The paper presents data on the determination of oil capacity and oligomer capacity of dispersed fillers based on silica with different particle sizes (from 50 nm to 250 microns). It is shown that using the oil absorption and oligomeric capacity data, it is possible to carry out a complete technological classification of dispersed particles by size and use it to create disperse filled polymer composite materials (DFPCM) with a given composition, type and structure parameters, as well as a set of operational properties. The values of the maximum disperse filler content (parameter φm) in DFPCM for particles of different sizes (from 50 nm to 250 microns) obtained by oil and oligomer adsorption and other methods are presented. For the first time, an algorithm for designing DFPCM compositions with different types of structures based on oil and oligomer capacity data of disperse fillers with different particle sizes and particle size distributions is proposed. The methods are simple, accessible and effective, which will allow solving problems of creating DFPCM with a given structure and a set of required properties quickly, reliably and with minimum costs. Compositions of DFPCM with different particle sizes of fillers, types of structures that cover the practical whole spectrum of modern polymer composites are given.

   Rheological and physicomechanical properties of epoxy binders based on ED-20 epoxy resin with isoMTHPA and HT-152B (modified isoMTHPA) anhydride hardeners and of a binder based on Ethal-370 modified epoxy resin with Ethal-450 amine hardener have been studied. The pot life of the binders based on ED-20 and anhydride curing agents (isoMTHPA and HT-152B) at 25 °С is quite high. The binders based on Etal-370 and Etal-450 must be preheated before use to 40-60 °C due to the high viscosity. The highest strength of 57.3 MPa was achieved for the composite based on ED-20 and HT-152B.

   This paper presents the first data on the dependence of thermal conductivity of DFPCM on generalized parameters and type of structure, according to the classification (dilute – low filled – medium filled – high filled systems), using the system of polyurethane + modified silicon carbide particles as an example. New plasma-modified silicon carbide particles with a unique structure and high specific surface area have been obtained, and their main characteristics necessary for calculating the compositions, generalized parameters, and determining the type of disperse structure of DFPCM have been determined. The main regularities are established that describe the relationship between the thermal conductivity coefficient (λ pcm) and the generalized parameter Θ, the type of structure of the DFPCM, and the surface morphology of SiC particles. For the first time, the contribution of the specific surface area of dispersed SiC particles (S BET − from 3 to 45 m²/g) to the thermal conductivity of disperse systems is shown.

   The properties of epoxy polymers modified with polysulfones and polyethersulfones have been studied by dynamic mechanical analysis and dilatometry. Modified systems have a reduced modulus of elasticity, which is probably due to a decrease in the final degree of cure in presence of the thermoplastics. The resulting epoxy resin-thermoplastic systems have a relatively high glass transition temperature and a higher level of residual stresses compared to neat cured ED-20.

   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.

   Self-supporting films and thick-walled moldings (blades) were obtained from solutions and melts of multiblock (segmental) copoly(urethane-imides). The initial copoly(urethane-imides) were obtained on the basis of aliphatic polyesters: poly(propyleneglycol), poly(diethyleneglycoladipinate) and polycaprolactone, dianhydride of 1,3-bis(3’,4-dicarboxyphenoxy) benzene and aromatic diamines: 4,4’-bis-(4”-aminophenoxy)biphenyl and 1,4-bis(4’-aminophenoxy)diphenylsulfone. Samples of films and moldings were studied by IR spectroscopy, TGA, DSC and mechanical analysis under static and dynamic (DMA) experimental conditions. It is assumed that the diff erences in the properties of films and moldings are due to an increase in the proportion of aromatic blocks due to microdestruction of polymer chains and increased interfacial interactions of polyester and urethanimide microphases (blocks) in polymer systems during the processing of polymers from the melt by injection molding.

   To obtain an ion exchange compound for process water treatment, a relatively environmentally friendly oligomer was sulfonated by adding a sulfogroup to the benzenering in the oligomer. The dynamic change capacity of the obtained ion exchanger was 0.74–0.98 mg-eq/g, the static change capacity was 1.25–3.22 mg-eq/g, the volume density was in the range of 1189–1206 kg/m³. The study of the optimal parameters of the process of obtaining an ion exchanger (sulfocationite) based on a carbamide-phenol-formaldehyde oligomer was carried out by planning a multifactorial experiment. The optimal value of the output parameter is 78,13 %.

   The effect of poly-N-vinylpyrrolidone on the size characteristics, morphology, composition of particles obtained by the reduction of cobalt ions in aqueous solutions, and the distribution of particles over the surface of glass microspheres has been studied. The reduction of cobalt ions in the absence of poly-N-vinylpyrrolidone leads to the formation of particles with a size of 200 nm on the surface of glass microspheres. The use of poly-N-vinylpyrrolidone made it possible to obtain particles ranging in size from 30 to 300 nm, with a more localized distribution of particles on the surface of glass microspheres. The resulting particles are a mixture of metallic cobalt and cobalt oxides.

   Investigations of the parameters of the reinforcing structure in the form of a woven fabric of a polymer composite material were carried out by numerical technologies in order to determine the geometric and elastic-viscous parameters of the elementary periodic cell of the filler, which is regularly repeated in its architecture. The results obtained were used in the development of a computer system for designing and calculating the functional parameters of the unit cell of a reinforcing woven structure of a polymer composite. The created numerical images of the surface of the textile reinforcing structure made it possible to make adjustments to the results of model solutions that increase the accuracy of the software solution of the problem of multifunctional study of the filler parameters in order to highlight the functional properties of the unit periodic cell of the woven structure of the polymer composite.

   A new method of electroprometry has been proposed that allows continuous investigation of extended sections of a hollow fiber membrane. Samples of polysulfone hollow fiber membranes with different porous structures were obtained: finger-shaped and spongy. These membranes were examined on a laboratory electroprometric apparatus with continuous scanning along the length of the hollow fiber membrane sample at a high voltage of 15 kV. Defects were detected in these hollow fiber membranes by the proposed method of electroporometry, the nature of which was then investigated using scanning electron microscopy. A correlation was found between the size of the detected defect and the magnitude of the corona discharge current signal: the larger the defect, the greater the absolute value of the current. It is shown that the proposed method can be effectively used as an express method to study the homogeneity of the porous structure of hollow fiber membranes in extended areas with geometrical localization of possible defects.

   Composites based on waste products from the production of 5-hydroxymethylfurfural - "humins" and melamine or urea (as a cross-linking agent) with wood fl our (as a filler, 70 % by weight) were obtained. Studies of the physical and mechanical properties of materials with different contents of melamine or urea have been carried out, which have shown that the composites humins: melamine (2,5: 1) and humins:urea (2:1) have a tensile strength of 150 and 165 MPa, respectively, similar to composites based on melamine and urea-formaldehyde resins.

   The article presents the results of the research carried out by the specialists of POLYPLASTIC Group LLC on the modification of recycled polyethylene with small amount of various chemical additives. The results of the evaluation of the viscosity, physical and mechanical properties of the obtained materials, as well as rheological curves, are presented. Data on the introduction of antioxidants into recycled materials to improve thermal stability after recycling are presented. The use of this modifiers makes it possible to increase or decrease the viscosity of the material, while the strength properties are practically unchanged. The possibility of cross-linked polyethylene recycling is shown, data on the viscosity and physical and mechanical properties of the obtained granulate are given, which are close to the properties of extrusion grades.

   А basic composition based on polyvinyl alcohol hydrogel was obtained to create a plastic mass of the “Slime” type with the required set of properties and an extended service life.

   The article discusses the main physical and mechanical characteristics of monofilaments made of superengineering polymers, which affect their suitability for processing by various textile technologies. These characteristics have been compared with those of high-density polyethylene monofilaments, which are successfully used in the creation of both single-layer and multilayer woven structures. The main limitations on the use of polymer threads in braiding and weaving technologies are revealed.