The study of the behavior of the Gruneisen function is an important characteristic for a comprehensive study of the crater formation process and the dynamics of destruction of model polymers widely used in practice and bearing extreme thermal and power loads during operation. In this regard, polyethylene and polymethylmethacrylate were selected as samples for the study, the temperature dependence of the Gruneisen function was investigated and diagrams of the state of the studied polymers were constructed.

The scaling analysis of reinforcement effect of nanocomposites polyurethane/graphene and polyurethane/carbon nanotubes was performed. It has been shown that reinforcement degree (or elasticity modulus) of these nanocomposites is defined by two following parameters: size of particles (aggregates of particles) of nanofiller and their dimension. Irrespective of nanofiller type decreasing of the indicated characteristics leads to an increasing of indicated nanocomposites elasticity modulus (reinforcement degree).

The paper considers mathematical models of heat propagation in cable networks that provide a given temperature regime of product transportation in pipelines. Temperature stresses and deformations caused by heat flow are calculated in the «cable-pipeline» system. Numerical calculations are carried out using the finite element complex «Solid Works».

The article identifies an important environmental problem – the ever-increasing amount of waste of synthetic polymeric materials and their harmful effects on the environment. At the same time, according to the authors, at the present time, the most relevant is to impart biodegradability properties to large-tonnage traditional polymers (polyethylene, polypropylene, etc.). The above analysis of literature data shows that the most optimal option for solving this problem and increasing the ability of polymers to degrade and biodegrade is the development of polymer-based composites with the addition of natural components.

The article presents the results of the properties analysis of modern polymer adhesive materials for their compliance with the operating conditions of shaft-bushing joints, which are used in automotive and agricultural machinery, gearboxes. A shaft-bushing joints assembly original method with directional formation of polymer layer combined structure is presented. The strength of the polymer shaft-bushing joints assembled according to the developed method exceeded the strength of conventional polymer shaft-bushing joints by 1.2–2.5 times.

The purpose of this work is an experimental study of the effect of technological adhesive used when laying out reinforcing fabrics on the surface of a curved tooling on the heat resistance of parts made from polymer composite materials.

It is shown that the introduction of this method of soda regeneration in production will significantly intensify the process of autoclave soda leaching of tungsten products, especially of poor and difficult to leach concentrates, by increasing the soda equivalent.

The complexing ability of polyampholytes synthesized on the basis of polyacrylic acid and aliphatic diamines with respect to heavy metal Cu(II) has been studied. The structure of the formed polyampholyte-metal complexes was resolved by IR spectroscopy. The calculated data showed that as the length of the hydrocarbon chain of the aliphatic diamine increases, the mixing energy of the polyampholyte and the solvent decreases, and the highest thermodynamic affinity is between the solvent and the EDA-based polyampholyte. It has been established that the stability of the complexes does not change in the homologous series. It has been shown by thermogravimetry that the process of decomposition of complexes occurs in three stages and ends at 380–390

°С.

The formation of polymeric membranes with the desirable structure and properties requires consideration of the influence of a number of factors In this work, in order to understand the thermodynamics of the deposition process of membranes from polysulfone (PSF), triple phase diagrams were studied. The morphology and gas separation properties of flat-sheet asymmetric PSF membranes obtained by the phase inversion method using various coagulants were also investigated.

A one-stage method for the synthesis of copper nanoparticles in solution by microwave radiation using ascorbic acid as a reducing agent and chitosan with different conformations of macromolecules as a stabilizer is presented. The resulting dispersions are aggregatively stable. It has been shown that the sizes of the formed nanoparticles are 22 nm in chitosan solutions with the rigid rod conformation of macromolecules and 25 nm in the coil conformation. The effect of nanoparticles on the thermophysical characteristics of the polysaccharide was shown: the shift in the glass transition and degradation temperatures was ~20 and 47 °C respectively.

The graft copolymerization of acrylonitrile onto chitosan with dinitrilazoisobutyric acid as initiator was investigated. The grafted copolymerization was confirmed by infrared spectroscopy. The dependence of the properties of the grafted copolymer on the conformational characteristics of the polysaccharide was established. The degree and efficiency of acrylonitrile grafting on chitosan in the case of the tangle macromolecule conformation are lower than when the macromolecules of the polysaccharide are in the rigid rod conformation under the same synthesis conditions. The grafted copolymers have higher physical and mechanical characteristics compared to the original chitosan.

Studies of the flexural and compressive strength of concrete with the substitution of 20 % of the volume of sand for waste from PVC panels have been carried out, the tests were carried out on the seventh day of hardening of the samples in the mode of humidity change from 90–95 % to 50–55 %. The effect of the PVAc additive in the amount of 10 % by weight of cement on the resulting composite was investigated. The TiO₂ photocatalyst was applied to the surface of the mold to produce concrete with photocatalytic properties, as well as UV protection.

This paper describes a method for measuring the viscosity of a polyamide-6 solution and a composite based on it. The essence of the method is to measure the time of flow of the polymer solution through the viscometer capillary at a constant temperature according to GOST 18249-72. The relationship between the molecular weight of the polymer and its viscosity has been determined

The results of a study of random copolyethersulfone sulfides based on 4,4^/-dichlorodiphenylsulfone, 1,1-dichloro-2,2-di(4-hydroxyphenyl)ethylene and sodium sulfide are presented.