A method for estimating the coefficient of friction at high temperatures up to 220°C in the thermal chamber of a bursting machine has been developed. It is shown that the coefficient of kinetic friction with a change in temperature from 25°C to 220°C varies from 0.04 to 0.1. In the developed method, the coefficient of static friction and the coefficient of kinetic friction are determined. The coefficient of static friction at a temperature of 25°C to 220°C varies from 0.06 to 0.13.

The processes of peroxide crosslinking of polyethylene at high temperatures are considered. A significant decrease in the density of the polymer network at temperatures of 225-230°C is shown, which indicates a high risk of overheating during the crosslinking process.

It is shown that the set of data on the loss of wall thickness when determining the magnitude of hydroabrasive wear is a multipeak curve. An attempt was made to determine the amount of wear in accordance with the requirements of ISO 6133 "Analysis of multipeak traces". It has been shown that this treatment reveals higher wear values than those applied according to EN 295-3.

The issues on the assessment of rheological properties of dispersed filled polymer composite materials (DFPCM) in terms of generalized parameters of disperse structure are considered. The dependences of pressure loss during injection molding of thin-walled DFPСM products with different types of disperse structure: dilute, low-filled, medium-filled and high-filled systems are given for the first time. It has been established that to obtain DFPCM based on thermoplastics with good processing properties and products with high strength, it is necessary to create materials having medium-filled type of structure and the generalized parameter Θ ≈ 0.5-0.6 vol/vol. The algorithm for calculating the dispersed filler content with known basic properties to provide a given type of DFPCM structure is proposed.

Methodological approaches to the implementation of the nanostate phenomenon in the formation of the optimal structure of composite materials and metal-polymer systems at different levels of organization have been developed. The concept of energy and technological conformity of the components of functional composite materials and systems is proposed. This concept consists in ensuring the parameters of composite materials energy characteristics adequate to the value of the activation energy of the prevailing structural process, which determines the optimal parameters of stress-strain, adhesion and tribotechnical properties under technological influences on the components in the process of obtaining composite and its processing. The concept has been tested in the development of nanocomposites based on industrial polymer matrices, which surpass analogues in terms of service properties.

The work is devoted to the study of the effect of characteristics (melt flow and density) of various grades of polyethylene on the electrical resistance of polyethylene composites with carbon black at normal and elevated temperatures. Such polyethylene composites are characterized by abnormally high values of the positive temperature coefficient of electrical resistance in the melting temperature range of the polyethylene matrix. This causes the effect of power self-regulation of such heaters (selfregulating polymer heaters). It has been established that the content of carbon black, which provides a stable and clear effect of self-regulation of such heaters, is located in a concentration region approaching the region of the second concentration-structural percolation transition, which for all investigated polyethylene composites was about 12 vol% of carbon black. The growth rate of electrical resistance at these carbon-black contents is influenced by crystallinity of the polyethylene matrix.

The article describes the methods for producing polymers and compositions based on aromatic acids (terephthalic, isophthalic) and various diols (ethylene glycol, propylene glycol, butanediol and others), developed by domestic and foreign scientists.

The results of studies of the main characteristics of ballistic organocomposites with the use of aramid fibers of the third generation Rusar-S of various textile structures as a reinforcing filler are presented. Their physical and mechanical properties were determined, and an assessment of the splinter resistance of these materials was carried out. Use of new fibers in composite armored products enables to increase their anti-splinter resistance by 11%.

A comprehensive study of the rheological properties of ABS-plastic grades used for the manufacture of fi laments for 3D printing by the FDM method has been carried out. It is shown that under the printing temperature-speed conditions, the viscous properties of melts of different grades and activation energy of their viscous flow differ significantly. The temporal parameters of the thermal stability of melts at an elevated (250°C) temperature were determined by the rheological method. It is shown that, under printing conditions, the polymer does not undergo noticeable degradation, assessed by the change in its effective viscosity. Viscoelasticity, which determines the dimensional accuracy of products and the thickness of the deposited layer, was evaluated by the degree of swelling of the extrudate under different flow conditions. Criteria for the applicability of ABS-plastic grades for fi lament production are proposed.

The paper presents the results of a study of water dispersions of Aquapol® 11 and Aquapol® 22 polyurethane grades for use in the production of artificial leather.

One of the areas of application of composite materials is their use in the manufacture of parts of prosthetic limbs. Advances in the development of composite materials in recent years have led to an active growth in their use in modern orthopedic medicine. Composites have excellent characteristics of strength and weight compared with metallic materials, as well as biocompatibility, which allows them to be used in the manufacture of prostheses. The article discusses various composite materials and their physico-mechanical properties, manufacturing companies and their products for people with different needs. VIAM has developed a whole series of materials that can be proposed for the manufacture of prostheses.

The kinetics of destruction of hollow glass microspheres (HGM) of various size groups is investigated. It is shown that removing a certain part of large-diameter microspheres from the initial batch by sieving can significantly increase the specific strength of the remaining HGM.

The technological parameters of the curing of unsaturated polyesters synthesized on the basis of alcoholysis products of secondary polyethylene terephthalate and used in the production of fiberglass pipes have been studied. It is shown that unsaturated polyesters synthesized on the basis of alcoholysis products can completely substitute imported resins of 196 and 196A grades in the production of fi berglass pipes.

The main stages of revamping of the cumene production plant of Kazanorgsintez PJSC for the implementation of technology based on zeolite catalysts are described. The changes in the main technical and economic indicators of production process are described. Also, a brief description of existing cumene production technologies is presented.