A generalized nomogram for designing the type of structure and compositions of dispersion-filled polymer composite materials (DFPCM) with flame retardant fillers having high combustion resistance and a high oxygen index (OI) is proposed on the example of polymer composite based on ethylene-vinyl acetate copolymer (EVA) and magnesium hydroxide of EcoPyrene brand. The nomogram combines into a single whole the previously obtained dependencies for the calculation and organization of different types of structure of DFPCM and data on combustion resistance and OI values.

The study of rheological and viscoelastic characteristics of modern grades of LLDPE and their mixtures with LDPE, intended for the production of fi lm products, as well as the evaluation of mechanical characteristics of films made of them have been carried out. As a result of studying the rheological properties of LLDPE and LDPE, it was found that polymer melts show behavior typical of pseudoplastic liquids. The flow index for all grades of LLDPE was 0.78–0.91, which indicates a narrow MWD of polymers; LDPE had a flow index of 0.56–0.57 and a higher activation energy for viscous flow than LLDPE.

The viscoelastic properties of the polymers were assessed by the value of swelling coefficient (Ks) at two test temperatures. It is shown that the Ks of LDPE significantly exceeded that of all studied LLDPE grades at the same shear rates or shear stresses. The increase in temperature had an insignificant effect on the Ks value for both LDPE and LLDPE. It has been found that an increase in the content of LDPE in mixtures with LLDPE leads to an increase in Ks.

The analysis of tensile properties of films obtained from the original polymers and their blends showed that the character of change in strength and elongation at break depends on the composition and type of LLDPE from different manufacturers. Films based on m-LLDPE of LUCENE brand had the maximum strength properties. The optimal content of LDPE in a mixture with LLDPE depends on the type of LLDPE and is no more than 10–20 wt.%.

The molecular weight distribution of monoalkyl(C₈–C₁₂)phenolformaldehyde oligomers modified with imidazolines based on sunfl ower or corn oil fatty acids and polyamines – diethylenetriamine, triethylenetetraamine, polyethylene polyamines was determined by gel-chromatography. The influence of the component and quantitative composition on the parameters of the number average and weight average molecular weights, as well as on the polydispersity of oligomers, was studied. Regularities have been revealed and assumptions have been made regarding repeating monoalkyl (C₈-C₁₂)phenol-formaldehyde fragments in the composition of oligomeric macromolecules.

The influence of the CO-4 stabilizer on the rheological properties of polymer composite materials based on UHMWPE has been studied. It has been shown that the addition of a CO-4 stabilizer to polymer matrices significantly affects the rheological properties of materials and their extrudability. There is a change in the conformations of macromolecular chains, the absence of dependence of the viscous component on the relaxation process of the dispersed system, an increase in the complex viscosity, which led to a deterioration in the processability of the material. Based on the Han curves, it is shown that the addition of a CO-4 stabilizer leads to a deterioration in the miscibility of mixtures, i.e., the phase separation of the components of the obtained samples increases.

The results of studies of changes in the physical and mechanical properties of heat-resistant polyethylene terephthalate (PET), polymide (PI) and fluoroplastic (PP) films, as well as synthetic polyethylene terephthalate (PET) and aramid fabrics in a wide range of specified exposure temperatures and temperature exposure times are presented. The most suitable heat-resistant polymer films and fabrics for use in inflatable structures of aeronautical equipment have been identified. An assessment of the operational parameters of the investigated materials showed linear character of change in properties in a given temperature and time interval of researches.

In this paper, the mechanism of ethylene initiation in the presence of an aluminum chloride – water catalyst in a heptane solvent of stoichiometric composition 1:1:1:2 was studied using the ab initio RHF theoretical quantum chemical method. The activation energy and thermal effect of this reaction were obtained. These data can be useful for further research in the field of cationic polymerization, and can also be used in the development of new technological processes of polyethylene with specified physicochemical properties characteristic of fiber optics.

Block-copolyether ketones containing >C=CCl2 groups, characterized by high thermal and mechanical properties, with quantitative yield and high values of reduced viscosity, were obtained based on various oligomers with condensation degrees of n = 1-20 using the method of acceptor-catalytic polycondensation. The structure of the resulting polyesters was confirmed. The kinetics of polyester structuring at the site of the double bond depending on temperature and dwelling time was studied.

Hydroxyl-containing ammonium oligomers containing a furan heterocycle were synthesized. Their use as modifiers of properties of rigid polyurethane foams makes it possible to improve technological parameters of molding and physical and mechanical properties of urethane foams. The quaternary ammonium compounds used were found to act as "soft" catalysts, cross-linking agents and flame retardants.

The use 0.5–1% of synthesized polyphenylenesterformaloxymate and polyphenylenetherarylateoxymate as modifiers in compositions with polybutyleneterephthalate increases the heat resistance of composites, changes the PTR to values convenient for processing.

The paper proposes a mathematical model for predicting the abrasion of polymer materials based on various brands of TPU after exposure to salt mist, simulating the operating conditions of refueling fuel hoses in seawater and/or on the coast.

Polymer composite materials have been developed using polyester-urethane-acrylate resin based on 2,5-furandicarboxylic acid obtained from plant biomass and a number of synthetic (carbon, glass, and aramid fibers) and mineral (basalt) fibrous fillers. The high operational characteristics of the obtained PCMs are demonstrated. The effect of hybridization of synthetic fibers with natural cellulose fibers (cotton) on the physical and mechanical properties of polymer composite materials has been studied. An increase in tensile strength with a simultaneous decrease in the density of PCM using a carbon fi ber/cotton hybrid filler is shown.

The effectiveness of surface modification of polyethylene terephthalate with a mixture of fluorine and oxygen to reduce the permeability to water and aqueous ethanol solutions has been studied. We obtained a decrease in the permeability coefficient of the modified fi lm for water and ethanol solutions, the degree of decrease in the permeability coefficient depends on the chemical composition of the liquid. Oxyfluorination leads to the production of a modified fi lm with an increased liquid diffusion coefficient compared to the original fi lm, which is associated with the formation of local defects which is confirmed by micrographs made with of an atomic force microscope and by measuring the surface roughness of the original and modified films.

In this work, plastisol compositions have been developed for the production of plastic masses based on chemically cross-linked polyvinyl alcohol and polymer expanded microspheres for the production of air clay