The paper presents the results of investigation of the effect of additives of various modifiers on the properties of polyphenylene sulfide (PPS) and glass-filled polymer composites (GFC) based on it (PPS SV-40). It is shown that the introduction of modifiers – ethylene copolymer with glycidyl methacrylate or low molecular weight modifier N, N1-hexamethylene bis(maleimide) (MG) – allows to significantly improve not only the technological properties of PPS, radically changing the mechanism of high-temperature degradation during processing (if in unmodified PPS the degradation reactions prevail, in the modified composition - branching and cross-linking), but also significantly improve the physical and mechanical properties of unfilled PPS and glass-filled PCM PPS SV-40.

It has been shown that for particulate-filled composites on the base of polyamide-6 at fixed nominal content of filler its effective fraction is defined by particles dispersion degree only. The dependence of the indicated fraction of filler on its aggregates structure serves as alternative description method. The composites properties are controlled fully by reduced (effective) filler content.

Depolarization currents in submicron polymethylmethacrylate (PMMA) films were measured using the thermally stimulated depolarization (TSD) method in the range from 170 to 450 K. The concentration of the solution was 0,5; 1,0; 2,0; 3,0; 5,0; 7,5 and 10.0 wt.%. The value of the polarizing electric field strength was 1.7·105 V/cm. The rate of temperature change was 5 K/min. Based on experimental data, the values of the released charge and the activation energy of relaxation processes depending on the thickness of the polymer film are shown.

The results of investigation of effect of PVDF films polarization in glow discharge plasma on their properties are presented. The dependences of the piezoelectric coefficient d33 on the plasma polarization parameters – treatment time, discharge voltage and current density – were obtained experimentally. The IR spectra of PVDF film samples polarized in glow discharge plasma are presented. The character of the influence of polarization parameters on the values of IR spectral peaks characteristic of α- and β-phases is determined.

Choice of boundary conditions and optimal parameters for measuring of oxidation induction time of cable polyethylene grade 153-01K with amine and phenolic type antioxidants was implemented in this work. OIT dependences on holding temperature in the ranges of 180–200°С in oxygen environment and 200–220°С in the air were calculated. For selected experimental conditions (air oxidizing environment, the sample thickness of 650±100 microns and the holding temperature of 210°С) the statistical estimation of accuracy was evaluated. Relative standard deviation of developed technique was shown not to exceed 7%.

The degree of impregnation of the fabric and the density of the composite materials were used to evaluate the porous structure of the composite materials obtained by impregnating a nonwoven needle-punched fabric made of polypropylene fibers with a linear density of 0.66 with an aqueous dispersion of polyurethane. The dependence of the degree of impregnation on the gap between the squeezing rollers and the concentration of polyurethane in the aqueous dispersion was investigated. When the concentration of polyurethane in the aqueous dispersion is below 15 wt.% and the gap between the squeezing rollers is less than 1 mm, the degree of impregnation does not exceed 0.3. To assess the change in the volume of fibrous filler during the heat treatment of the impregnated fabric, the relationship between the degree of impregnation and the density of composite materials was used. It was found that at the density of the fabric 117 kg/m³ the heat treatment of the impregnated fabric occurs without changing the volume of the fiber filler. When using a fabric with a density of 80 kg/m³ for reinforcing composite materials, the volume of fibrous filler.

This article presents a review of the literature data on the synthesis, properties and application of polyarylene ether ketones over the past 10 years.

Consideration is given to the flow and heat transfer of non-Newtonian chemically reacting fluid in a flat channel. Many assumptions were made on the basis of the fact that the flow occurs at low values of the Reynolds number and at a high Peclet number. The Ellis model with a viscosity dependent on temperature, pressure and the degree of chemical transformation was used as the rheological model. The flow is accompanied by a chemical reaction that leads to a sharp increase in viscosity. This, in turn, led to the inclusion of the kinetic equation of a chemical reaction in the mathematical model. A high viscosity medium was investigated. Therefore, dissipative heat emissions are accounted in the energy equation. The problem is solved for temperature first-order boundary conditions. We have shown the substantial influence of different parameters on the rate of growth in the hardened wall layer. The solution was analyzed numerically by the finite difference method according to the iterative scheme.

The article proposes a method for calculating the effective permittivity of a material with periodically distributed inhomogeneities. The method is based on the calculation of the equivalent electrical circuit of a unit cell of the material. To conduct experimental studies using three-dimensional DLP printing, samples of material with cylindrical air cavities of various diameters were manufactured. Comparison of the results of calculation and measurement of the effective dielectric constant showed a small divergence (up to 5%).

A method for numerical mathematical modeling of heating polymer composite materials (PCM) in a quasi-coaxial microwave chamber has been developed in the COMSOL Multiphysics software environment. This allows to obtain the optimal design of the working chamber in accordance with the dimensions and specified physical properties of the composite in order to realize the given parameters of microwave influence on PCM.

It has been established that at a minimum power level of 250 W, a quasi-axial microwave chamber provides an effective process of microwave energy dissipation during the processing of PCM with a filler in the form of a thin layer or sphere.

Modification of lowmolecularweight polyethylene with maleic anhydride and synthesis of grafted copolymer of low-molecularweight polyethylene with maleic anhydride and chitosan in melt using radical polymerization initiator were carried out under shear field conditions. The fact of copolymer formation was confirmed by elemental analysis and IR spectroscopy data. The synthesized copolymers can be used to obtain compositions of polyethylene with chitosan. Their presence contributes to an increase in the melt flow index, which leads to an improved distribution of particles of dispersed phase in the composition and manufacturability of its processing.

The effect of gossypol hydroxyl groups on the antioxidant activity of polyolefins is discussed. It is shown that the inhibitory activity of gossypol derivatives decreases with the increase in the degree of substitution of hydroxyl groups. It was found that gossypol hexamethyl ether and apogossipol hexamethyl ether are completely inert substances according to the inhibition criterion for polymer oxidation.

Natural magnetite obtained from serpentinite from Kabardino-Balkar Republic deposit, which is a promising modifier of polymeric materials used in the medical field, has been studied. Methods of magnetite grinding were studied, X-ray structure and X-ray phase analyses of serpentinite and magnetite were carried out. It has been established that the time of grinding the mineral has virtually no effect on its structure. It has been shown that the grinding method (dry or wet) affects the particle size and magnetic properties of magnetite. The study of natural magnetite extracted from serpentinite deposits of the Kabardino-Balkar Republic, which is a promising disperse filler for polymer composite materials, has been carried out.

At the current stage of research, studies are aimed at identifying the optimal ratio of structuring agent for siloxane rubber, as well as at establishing the optimal content of silicon-containing filler to ensure that osteoplastic materials are homogeneous compositions with high viscosity and a good complex of physical and mechanical properties.