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

As a result of the interaction of melamine and boric acid in an alcohol solution, complex salts containing one, two, and three acid molecules have been obtained. The resulting salts were introduced into the polypropylene melt, and the fire resistance and physicomechanical properties of the resulting composites have been studied. It is found that the introduction of these salts into polypropylene leads to an increase in the fire resistance of the original polymer. At the same time, in terms of heat resistance, manufacturability,. and rigidity, the composites are not inferior to the original polymer.

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.

Copolyarylene ether ketones based on a mixture of bisphenols 1,1-dichloro-2,2-di(4-oxyphenyl)ethylene and 1,1-dichloro-2,2-di(3,5-dibromo-4-hydroxyphenyl)ethylene with 4,4'-dichlorodiphenylketone have been obtained by high-temperature polycondensation in an aprotic dipolar solvent of N,N-dimethylacetamide. The structure and structure of the synthesized copolymers have been studied using the methods of X-ray diffraction analysis, IR spectroscopy, and turbidimetric titration. Basic physical and mechanical properties have been studied, which confirmed that these copolyarylene ether ketones can be used as highly heat-resistant structural polymer materials.

Copolyetheretherketones (co-PEEKs) with high performance characteristics have been obtained by means of a nucleophilic substitution reaction in a high-boiling solvent. The constitution, structure and basic properties of the synthesized polyesters have been studied. The constitution of polymer materials has been confirmed by IR spectroscopy and turbidimetric titration. It has been shown that co-PEEKs can find wide application as highly heat-resistant structural polymer materials.

The dependence of the dielectric constant and specific volume resistance of a structural composite based on (80 wt%) synthetic isoprene rubber and (20 wt%) low density polyethylene on the content of nanosized particles of aluminum fillers, Nalchikin and carbon black in small quantities is shown graphically. Using an electron probe method for studying the microstructure of a structural material, a hydrostatic weighing method based on determining the density of a composite by its double weighing and an electron shadow microscope, this paper presents models and physical mechanisms that lead to extrema in the permittivity and conductivity of composite materials.

This paper presents 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. The synthesis of copolyethersulfone sulfides with different ratios of polyethersulfone and polyphenylenesulfone sulfide units was carried out by high-temperature polycondensation by the reaction of nucleophilic substitution in N,N-dimethylacetamide medium and using potassium carbonate as an alkaline agent. The effect of the solvent used on the yield and reduced viscosity of polyethersulfone sulfides was studied. It has been shown that polymers with high reduced viscosity can be obtained in N,N-dimethylacetamide and N,N-dimethylformamide. The growth dynamics of the reduced viscosity of polyethersulfone sulfides was also studied depending on the ratio of sulfone and sulfide groups. The solubility of these polymers in various solvents has been studied.

The stress–strain and thermal characteristics of two block copoly(sulfone arylate)s stabilized with p -butoxyphenyl cyclohexyl phosphinic acid are studied. It is found that the organophosphorus compound manifests a stabilizing effect in relation to the physical and mechanical and thermal characteristics of the copolyesters.

Composite materials based on a polymer mixture -low density polyethylene and polybutylene terephthalate -have been obtained and investigated. To improve the compatibility of two thermodynamically incompatible polymers, a compatibilizer was used, which is polyethylene modified with maleic anhydride. It was found that the compatibilization of the polymer mixture low density polyethylene/polybutylene terephthalate, leads to a significant change in the basic physical and mechanical characteristics of the composite. It is shown that the introduction of compatibilizer leads to an increase in the viscosity of the polymer mixture, which is caused by a change in the density of molecular entanglements. In turn, compatibilized composites are inferior in hardness to noncompatibilized composites. It was found that changes in the morphology of composites upon compatibilization lead to an improvement in the strength of the material. It was shown that the plasticity of the polymer mixture increases upon compatibilization, which makes it possible to improve the dissipative capabilities of the material.

This study deals with the interaction between iron(III) oxide Fe 2 O 3 and a high-density polyethylene (HDPE) matrix and their mutual influence. The significance of this study is determined by the fact that the potential nanomodifier (iron(III) oxide Fe 2 O 3 as an ultradispersed medium (UDM)) is a product from the total oxidation of the F/FeO mixture that is known as a highly active nanomodifier–stabilizer of polymers. In view of this fact, an attempt at testing Fe 2 O 3 as a potential Fe/FeO source as a result of intramatrix reactions Fe 2 O 3 → Fe/FeO has been made in this study. In turn, iron(III) oxide Fe 2 O 3 was synthesized via the oxidation of a freshly prepared Fe/FeO mixture from iron(II) oxalate. It has been shown that the regenerative scheme Fe 2 O 3 ↔ Fe 3 O 4 ↔ Fe/FeO is implemented in the HDPE matrix with the predominant shift of processes to the right due to its reductive potentiality during the treatment of an HDPE + Fe 2 O 3 composite melt under certain temperature-time regimes ( Т ≥ 250°C and t ≥ 20 min). The nanocomposite polymer material (NCPM) HDPE + Fe/FeO with a set of enhanced physicochemical properties is formed.

This article contains material on the analysis of the interaction of barium nitrate with lithium and sodium tungstates in eutectic melts (Li 2 WO 4 –Na 2 WO 4 ) eut within the framework of thermodynamics and physicochemical analysis, which showed that the processes associated with the synthesis of barium tungstate, which is in demand in science and practice, are characterized by significant negative Gibbs energy, an important condition for achieving the goal of this work, and can be implemented at relatively low temperatures. The paper also provides material on the development of an optimized method for the synthesis of BaWO 4 based on the (Li 2 WO 4 –Na 2 WO 4 ) eut –Ba(NO 3 ) 2 system, which is characterized by high productivity and the yield of the target product in the nanocrystalline state. Barium tungstate was synthesized by thermal treatment of a stoichiometric mixture of reagents of a given mass at 600°C (accuracy ±10°C) for 40–50 min, followed by leaching and isolation of barium tungstate. The preparation was identified by the methods of chemical and X-ray analysis, and dispersion was determined by electron microscopy.

New halogen-containing oligoethers based on 1,1-hydroxy-2,2-di(4-hydroxyphenyl)ethylene and 1,1-dichloro-2,2-di(4-hydroxyphenyl)ethylene of various degrees of condensation were synthesized via high-temperature polycondensation. Polymer composites with different amount of synthesized oligoesters were prepared based on 4,4’-dioxydiphenylpropane and 4,4’-chlorodiphenylsulfone. Modern methods showed that the new composites are superior to industrial polysulfone in their main physicochemical and operational properties.

Block polyetheretherketones (PEEKs) were obtained via low-temperature polycondensation in organic solvent from oligoketones (OKs) of various compositions and structures combined with an equimolar amount of diphenylpropane. Phthalic-acid chlorides were used as an acid component. The synthesis method made it possible to obtain polyetheretherketones of the desired structure and molecular weight under room conditions for 1 h. The main performance properties of polyesters were studied. We showed that PEEKs have a high molecular weight and possess high thermal and mechanical properties combined with good solubility in organic solvents. The latter property makes it possible to process polyetheretherketones by pouring from solutions, which opens up broad possibilities to obtain various prepregs with low free volumes via impregnation of carbon and glass fibers from solution. A correlation between the degree of condensation of initial oligoketones and some performance properties of the polyesters was found.

Modified copolyesters using 3,5-dibromo-4-hydroxybenzoic acid chloride have been synthesized by the method of low-temperature polycondensation (acceptor-catalytic polycondensation). The main laws governing the synthesis of copolyesters have been studied. It was found that the presence of bromine atoms reduces the reactivity of the hydroxyl group due to the steric effect, as well as due to the possible formation of a weak hydrogen bond between the bromine and hydrogen atoms of the hydroxyl group. The main physical and mechanical characteristics of the synthesized copolyesters have been investigated. Copolyesters are heat- and fire-resistant high-strength polymers that can be used in various industries as non-combustible heat-resistant structural polymer materials.

The regularities of acceptor-catalytic polycondensation in the synthesis of copolymers containing arylate, sulfone, and dichloroethylene groups in the main chain have been studied. The optimal conditions for their production have been found. Infrared spectroscopy, elemental analysis, turbidimetric titration and other methods confirmed the formation of copolymers of the proposed structure.

A complex stabilizer based on a mixture of calcium and zinc stearates was developed, which was used to replace the tribasic lead sulphate in the formulation of cable polyvinyl chloride plasticate. The influence of a complex stabilizer on the basic physical and mechanical properties of cable polyvinyl chloride plasticate is investigated. It was found that the use of a complex stabilizer in the formulation of cable polyvinyl chloride plasticate does not lead to a decrease in the thermal, technological and operational characteristics of the material. It is shown that the thermal properties of the cable compound containing a complex stabilizer remains at the level of the original plastic. This is due to the ability of the complex stabilizer to effectively bind hydrogen chloride released during the destruction of the polymer matrix. It is established that the cable polyvinyl chloride plasticate containing in the formulation of a complex stabilizer in its mechanical characteristics is not inferior to the industrial compound, and in some respects surpasses it.

New halogen-containing oligoethers based on 1,1-hydroxy-2,2-di (4-hydroxyphenyl) ethylene and 1,1-dichloro-2,2-di (4-hydroxyphenyl) ethylene of various degrees of condensation were synthesized by the method of high-temperature polycondensation. Features are investigated and optimal conditions of synthesis of new oligoethers are defined. On the basis of polysulfone compositions with various maintenance of oligoethers are prepared. With usage of the modern methods of researches, it is shown that new composites surpass industrial polysulfone in the main physical and chemical and production characteristics.

Copolyarylates based on a mixture of 2,2-bis (4'-hydroxyphenyl) propane, 3,3-bis (4'-hydroxyphenyl) phthalide, terephthalic and isophthalic acid chlorides and 3,5-dibromo-p-hydroxybenzoic acid chloride were synthesized by low-temperature acceptor-catalytic polycondensation. To study the structure of the obtained polyesters and study the physical and mechanical properties, infrared spectroscopy, elemental, thermogravimetric, X-ray structural and thermomechanical analyzes were used. The obtained polymers have high values ​​of strength characteristics, thermal and heat resistance, good fire resistance.

Oligoketones based on 1,1-dichloro-2,2-di (4-hydroxyphenyl) ethylene and 4,4′-dichlorodiphenyl ketone were synthesized by the method of high-temperature polycondensation under the reaction of nucleophilic substitution; 1,1-dichloro-2,2-di (3,5-dibromo-4-hydroxyphenyl) ethylene and 4,4′-dichlorodiphenyl ketone of varying degrees of polycondensation. Oligoketones have been obtained containing reactive end phenolate groups, which readily enter into polycondensation reactions to form various copolymers. The composition and structure, as well as the conditions for the synthesis of these oligoketones were investigated. The formation of oligomers of a given structure has been confirmed by IR spectroscopy, elemental analysis, and X-ray structural analysis.

Modified aromatic polyethersulfones containing dichloroethylene and arylate groups in the main chain are synthesized. The kinetics of the synthesis of polyethersulfones by acceptor-catalytic polycondensation is studied. It is shown that the properties of the obtained polymers depend on the ratio of the initial monomers. The presence of two chlorine atoms in combination with an unsaturated bond in the initial monomer imparts high fire resistance and good physicochemical indices to the polyethersulfones based on it.