Mixtures of ultra-high-molecular-weight high-density polyethylene (UHMWPE), low-density polyethylene (LDPE), and polypropylene (PP) with various low-molecular-weight compounds were subjected to plastic deformation under a pressure of 1 GPa on an anvil-type high-pressure apparatus. The analysis of the mixtures was carried out by the DSC method and it was found that the thermograms of the deformed mixtures in the temperature range of 30-100°C contain endothermic peaks of melting of small polymer crystals and exothermic peaks of cold crystallization. The enthalpies of melting of polymers in mixtures could be either higher or lower than the enthalpies of melting of the initial polymers. Exothermic peaks were present on the thermograms of mixtures with fluorescein at temperatures above the Tm of polymers. Exo- and endothermic peaks below the Tm of polymers, as well as exothermic peaks above the Tm of polymers, were associated with the epitaxial growth of polymer crystals. The characteristics of thermal processes in deformed mixtures correlated with the amount of CH3 groups in macromolecules.

Polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC) and chlorinated paraffin СP-66T, taken in an amount of 18% by weight of the composition, were chosen as fire retardants. It is shown that the main process of degradation of compositions of PDCPD with chlorinated paraffins is determined by the onset of degradation of the matrix polymer. It was found that the most effective of the considered flame retardants is chloroparaffin СP-66T, which reduces the thermal effect at the stage preceding combustion by 54,3%.

The purpose of this work is to investigate properties of polymer compositions based on Ultra High Molecular Weight polyethylene filled with nanosized modifiers. The ability of creation polymer materials with improved technological and operational properties is shown.

The sizes of hollow glass microspheres were studied using three different methods. It is shown that the results of determining the average diameter of microspheres using a laser particle analyzer may differ markedly from the results of measurements made using sieve equipment. The most objective estimation of the size of hollow glass microspheres is provided by microscopic analysis.

The paper presents the results of a study of the frictional characteristics of mineral dispersed fillers — graphite and schungite. It is shown that the introduction of a mixture of these dispersed mineral modifiers into phenol-formaldehyde composites reinforced with cotton fabric leads to a significant improvement in tribological characteristics.

The structure, morphology, physical and mechanical characteristics, and chemical stability of composites based on epoxy resin Epoxy520 filled with microdispersed cement filler M400 were studied. The structure and morphology of the obtained samples of compositions were studied using optical and electron microscopy. A significant increase in a number of characteristics was found: elastic modulus, fire and heat resistance, resistance to acetone-containing organic solvents. The effect of "thermodestructive quenching" is found, which manifests itself in a significant increase in strength at a temperature of 250-300°C. The data obtained as a result of research opens up the possibility of producing epoxy plastics with improved performance characteristics, and in particular, increased resistance to high destructive temperatures.

The article presents the results of research aimed at creating of effective compositions of composite wood-plastic board materials based on fillers from cotton stalks and polymer binders.
IIt was found that for all the considered plates with a density of 600, 700 and 800 kg/m3, the maximum value of the bending strength of composite wood-plastic materials (14.8–22.9 MPa) is observed when the content of small particles of the crushed mass of cotton stems is from 10 to 20%, and the maximum value of the tensile strength perpendicular to the plate layer (0.58–0.91 MPa) – at the content of a fine fraction from 15 to 25%. The minimum water absorption of plates at three densities of 650, 750 and 850 kg / cm3 was recorded with a fine fraction content of 15–18% in the mass.
It was revealed that the high value of the ultimate strength in static bending of composite wood-plastic materials with a density of 650, 750 and 850 kg/cm3 with a content of the fibrous part of cotton 20-60% is in the range of 14-15,5 MPa, 17,5-19,1 MPa and 20-22,2 MPa, respectively. The least water absorption and swelling of the slabs is observed when the content of the fibrous part is in the range of 30-40%.

A steady-state non-isothermal process of forming a viscoelastic flat polymer film is considered. The polymer melt is extruded through a flat die, subjected to uniaxial stretching and at the same time air cooling, and then finally cooled down on a chill roll. It is assumed that the film is wide enough and the distance between the extruder die and the cooling roller is minimal to such an extent that the change in the width of a film in the course of longitudinal stretching can be neglected. From a rheological standpoint, a polymer melt is a viscoelastic fluid. The upper-convective Maxwell model is used, for which the viscosity and relaxation time are assumed to be temperature dependent. The mathematical model is supplemented by the equation of non-isothermal  crystallization kinetics. The problem is solved by a numerical method of finite differences.

For the manufacture of cabinet furniture, chipboards and medium-density fibreboards (MDF) are widely used. By test methods for physical and mechanical properties, they must comply with the requirements of the relevant state standards. Analysis of some of these standards has shown that some of the test methods need to be changed. These state standards include: for fiberboards - GOST 32687-014; for MDF – GOST 10635-88 and GOST 23234-2009.

Based on ready-made powder compositions of PEN-I materials modified with oxidized or thermally expanding graphite, fireresistant epoxy-novolac foams were obtained. By varying the content of the blowing agent, it is possible to control the apparent density of the foams within 100-300 kg/m3. The physical and mechanical characteristics of the resulting foams were studied. A mathematical model for planning an experiment has been developed, which allows to determine the optimal composition. The results of tests to determine the resistance of foam samples to combustion showed that the resulting foams behave as fire-resistant structural materials.

The influence of the molecular weight and composition of polyalkyl (meth) acrylate thickeners on the properties NS-3 ultralow pour point naphthenic base oil (Nynas, Sweden) was determined. Using standard experimental techniques, it has been shown that copolymers of higher alkyl methacrylates with C12-C15 alkyl groups, containing 5-15% methyl methacrylate or butyl methacrylate units and having an average molecular weight Мn = 18000-20000, have good thickening properties and high resistance to mechanical destruction (which are not inferior to the indicators of the used foreign additive Viscoplex 0-220). The results made it possible to develop a thickening additive K-64-03 for low pour point transmission oil, which can be used in highly loaded machinery in the winter conditions of the Far North. Additive K-64-03 exhibits the required thickening properties at elevated and negative temperatures, does not worsen the ultra-low pour point of the base oil (below minus 70°C) and has a  high resistance to mechanical destruction.

A new wear-resistant composite material based on UHMWPE has been developed, on the basis of which it is possible to produce seals that are not inferior in their characteristics to chevron rings for hydraulic devices. To give products an additional frame structure and rigidity fibrous fillers (banavis) have been used.

In this work, oligoesters with terminal hydroxyl groups were obtained by directed glycolytic degradation of polyethylene terephthalate. The possibility of obtaining bifunctional reactive oligomers with an average molecular weight of 865 g/mol by directed glycolytic destruction via a dissolution-degradation strategy in dimethyl sulfoxide at a low concentration of ethylene glycol (32.3 mass parts per 100 mass parts of polyethylene terephthalate) was shown. This process allows us to partially solve the urgent problem of recycling post-consumer polyethylene terephthalate.

The results of the study of the influence of the technological mode of injection molding on the pattern of changes in the physicomechanical properties of nanocomposites based on low density polyethylene filled with a thermosol of household waste are presented. As an object of study, nanocomposites containing 10 and 40 wt.% of thermosol are used.

The article presents the results of experimental studies of caprolon turning machining with the cutting fluid use. It is scientifically substantiated the use of an aqueous emulsion with the addition of a water repellent as a cutting fluid during caprolon turning machining. On this basis a new method for turning caprolon blanks was developed and patented. The fact of decrease in the water absorption capacity of caprolon in the case of its turning with the supply of an aqueous emulsion of potassium palmitate to the cutting zone has been established experimentally. At the same time, turning caprolon in the traditional way leads to the activation of the water absorption process. It has been experimentally proven that turning caprolon with the supply of an aqueous emulsion of potassium palmitate to the cutting zone provides a better processed surface of the part compared to the traditional turning method. This is evidenced by a more uniform deviation profile of the depressions and protrusions of the treated surface and the numerical values of the roughness parameters. The results of microstructural studies of caprolon shavings are presented. It has been established experimentally that turning machining of caprolon using an aqueous emulsion of potassium palmitate contributes to the formation of continuous flow chips whereas turning caprolon in the traditional way leads to the formation of segmented chips.

An process is being developed, which consists in simultaneously carrying out the drying and demonomerization of polyamide-6 granulate.
The properties of the samples obtained before and after the combined drying-demonomerization process, such as the content of low-molecular compounds and relative viscosity, were determined.
It is shown that in the process of combined drying-demononization of polyamide-6 granulate, the polymer acquires properties that respond modern requirements for granulate, ready for processing into filaments, fibers and plastics products.