The paper discusses the main patterns of structure formation and the production of highly filled polymer composite materials based on a deformable particulate filler from rice straw (agricultural waste) and a dispersion of polyvinyl acetate (PVA) in water. t has been established that when using a deformable filler of rice straw powder, it is possible to obtain under high pressure (up to ~230 MPa) pressing DFPCM with the highly-filled type of structure and the content of dispersed filler up to ~90% by volume. Such PCM has a sufficiently high level of physical and mechanical characteristics - compressive strength ~104 MPa and elastic modulus ~ 3.0 GPa, which opens up opportunities for its wide application and production of products for various purposes from "green chemistry" materials.

The article analyzes the general patterns of thermooxidative destruction of heat-resistant polymers in the temperature-time interval of processing and operation of polymer composite materials based on them and suggests optimal approaches to their stabilization.

The work is devoted to the study of physical and mechanical processes occurring during the processing of modified and filled etheretherketone, and the development of a composite material with high performance properties. The effect of co-polyarylethyrketone and glass and carbon fibers on the properties of polyetheretherketone is shown. The critical length of reinforcing fibers is calculated. The effect of the heat annealing process on the properties of the obtained compositions of different compositions has been revealed.

The article presents the results of studies of basic physical, mechanical, tribological and electrotechnical properties of composite thermosetting polymeric materials having optimal composition based on solid resin phenol formaldehyde resins and dispersed fibrous filler obtained by mechanical recycling of cellulose fibrous waste products of pulp and paper industry. Physical and mechanical properties (density, tensile and bending strengths, impact strength, degree of absorption for moisture and mineral oil), tribological indicators (wear intensity and stability, friction coefficients in the contact zone of a friction pair under various staticdynamic and thermal loads), electrical characteristics (volume resistivity, electrical strength) and a brief analysis of structural changes in the studied phenolic composites, as well as recommendations for their use as technical products for machine-building and general electrical purposes are presented.

The structures of novolac monoalkyl(C₈–C₁₂)phenolformaldehyde oligomers modified with imidazolines based on fatty acids of sunflower or corn oils and polyamines – diethylenetriamine, triethylenetetraamine, polyethylenepolyamines were investigated by IR-spectroscopy. As a result of the analysis of the initial and final products, a reaction mechanism is proposed. Optical densities of the absorption bands of the main functional fragments were calculated, and the regularities of the changes depending on the qualitative and quantitative composition of the oligomers were studied.

The radical copolymerization of N-[3-(dialkylamino)-propyl]methacrylamides with a number of (meth)acrylic amides and esters in organic solvents over a wide range of molar ratios has been studied. Co-polymerisation constants for five polymerisation systems in 1,4-dioxane and toluene have been determined by the Feinman and Ross method. The influence of the solvent on the kinetics of the copolymerization of the studied monomers was found, which manifests itself in a change of the reactivity ratios of the monomers upon varying the polarity of the medium. For the obtained polymers, the presence of thermosensitive properties in aqueous solutions and the effect of the concentration and composition of copolymers on their solubility in water were shown.

The radical copolymerization of butyl methacrylate with p-cyclopropyl styrene (I) and its monochlorine- (II), gemdichlorine-substituted derivatives (III) has been carried out and the basic regularities of formation of functionally substituted cyclopropyl styrene have been revealed. The composition and structure of the synthesized copolymers have been established. The copolymerization constants have been determined, the Alfrey–Price Q–e parameters and the microstructure of copolymers have been calculated. It has been established that the new copolymers are characterized by good optical indices (nD²⁰ =1.640−1.650). For BMA + (I–III) copolymers in the range of 400−1100 nm, the base light transmission is 88−90%. It has been shown that the copolymers obtained from these monomers show excellent plasticity, due to which they can be used in making of small-sized injection molding products with improved exploitation properties. The characteristic viscosity of BMA + (I−III) copolymers is [η] = 0.90−1.02 dl/g. The copolymers based on BMA + chlorinated cyclopropyl styrene show incombustibility, whereas BMA-styrene copolymers are self-extinguishing. It has been found that the obtained copolymers show greater thermal stability than polystyrene itself. The copolymers obtained on the basis of chloro-substituted cyclopropane show optical transparency, which is an important characteristic for their application in optics.

The modification of low-density polyethylene/polybutyleneterephthalate (LDPE/PBT) polymer composites with organoclay was carried out and the main physical and mechanical properties of the obtained materials were studied. It has been found that organoclay has a significant effect on the basic properties of polymer composites. It is shown that such indicators as fire resistance, melt viscosity, density, heat resistance and deformation-strength properties of composites containing organoclay differ noticeably from similar parameters of the parent material. In this case, the change in properties is due to the influence of organoclay particles on the supramolecular structure of composites LDPE/PBT.

The deformation-strength characteristics of films made from a mixture of HDPE and LLDPE modified with chalk were studied. It is shown that the introduction of a chalk concentrate of more than 16 wt.% (the content of chalk concentrate is 20 wt.%) has a negative effect on the strength and relative elongation at break of the composition of HDPE with LLDPE, as well as on the strength of the welded joint of polymer films. The strength of the films in the longitudinal and transverse directions significantly depends on the composition of the composition. The strength of the weld, obtained by ultrasonic welding, decreases sharply when the chalk content in the system is more than 16 wt.%. The introduction of more than 10 wt.% LLDPE into a HDPE-based chalk-filled composition is inadvisable..

For the first time, calculations of a reinforced polymer composite material (ArPCM) based on T-25 fabric (VMP) and developed modified epoxy matrices with an active diluents (AR) of different nature, structure and characteristics (laproxides and laprolate), a complex of physical and mechanical characteristics were performed using a generalized 3D models of the elementary structural cell of the anisotropic material ArPKM and computational engineering systems (CAE). Calculations and experiments have shown that all the studied modified epoxy matrices can be used in the design of products from ArPKM, however, preference should be given to matrices with E-181 and DEG-1 grade Laproxides, which fully meet the strength requirements for designing products subjected to forces during operation.

The flow and heat transfer of a viscous chemically reacting liquid in a flat channel during the molding of composite products are studied. The main assumptions in the task definition were made on the basis of the high viscosity of the liquid and its low thermal diffusivity. The Brinkman equation is used as a motion equation. The flow is accompanied by a chemical reaction, resulting in a sharp increase in viscosity. The viscosity is considered to depend on the temperature and the degree of conversion. This, in turn, led to the inclusion of the kinetic equation of a chemical reaction in the mathematical model. The energy equation is denoted using a single-temperature model and includes dissipative heat emissions. The problem is solved for temperature first-order boundary conditions. The calculations are given for the Nusselt number distribution and the velocity profile transformation. The task was solved numerically by the finite difference method using iterations.

The purpose of the study is to apply a previously developed model for predicting abrasive wear of products made of thermoplastic polyurethanes to materials based on plasticized polyvinyl chloride. Confirmation of the validity of the proposed approach to assess the impact of various wear factors on weight reduction of plasticized polyvinyl chloride (PVC). Comparative analysis of wear of materials based on thermoplastic polyurethane and plasticized PVC.

The effect of protective methane diffusion flux on the properties of polyethylene pipeline walls is proposed to be taken into account. It has been suggested that the protective diffusion flux initiated by the high-pressure system in the gas pipeline suppresses the oxygen diffusion process of air that occurs under atmospheric pressure.

The results of a study of mixing compositions based on polypropylene and vegetable fillers modified with an enzyme preparation are presented. During the experiment, the optimal modification time and the ratio of the volume of water to the mass of the vegetable filler during modification were determined. Physical and mechanical tests revealed that the composites with the modification were superior to the basic composites without the modification.