Polyetheretherketone (PEEK), which is highly resistant to aggressive media and various types of radiation, is widely used in various industries. At the same time, the information on the molecular weight characteristics of PEEK, which is necessary for the creation of polymer materials with specifi ed properties, is quite limited. Determination of these characteristics is complicated by the almost complete insolubility of PEEK in organic solvents. The work is devoted to the analysis of the applicability of viscometry, determination of the melt fl ow index and gel permeation chromatography (GPC) for assessing the molecular weight characteristics of PEEK. The preliminary modifi cation of the polymer to transform it into a soluble state has been considered as an alternative approach. A GPC-method of the determination of molecular mass of sulfonated PEEK has been developed. The values of average molecular weights for samples produced by Petrov Institute of Plastics and a commercial sample Victrex 150G were determined. Good agreement of the GPC data with the results of determining the melt fl ow index of the polymer makes it possible to consider the latter as an express method for assessing the molecular weight of a polymer.

The eff ect of thermal oxidative aging on the structure and properties of polysulfones PSF-190 (Institute of Plastics JSC, Russia) and Udel P1700 (Solvay Specialty Polymers, Belgium) has been studied. The shelf life of the selected grades of polysulfones has been predicted. The diff erence in the course of the low-temperature thermo-oxidative aging process for PSF-190 and Udel P1700 is shown. It was found that the main changes in such characteristics as density, tensile yield stress, elongation at break occur during the fi rst 250 hours of thermo-oxidative aging. The value of the specifi c volume electrical resistance of polysulfones does not change under the infl uence of temperature and time under conditions of low-temperature thermo-oxidative aging.

The crystallization kinetics of low melt fl ow index polyetheretherketone has been investigated. The purpose of the work was obtaining the parameters of the crystallization kinetics, which allow infl uencing the properties of the products obtained during the processing of polyetheretherketone into thick-walled products.

The considered material was PEEK-5G grade polyetheretherketone with low melt fl ow index. The study of the process was carried out by the method of diff erential scanning calorimetry in isothermal mode.

The processing of experimental data was performed using Kolmogoff-Avrami equation, the activation energy of the process – using Kissinger one.

The parameters of the process were calculated: the nucleation and growth rates of crystalline structures, the activation energy of the process. The temperature range for the crystallization of polyetheretherketone in the technological process of obtaining thickwalled products has been established.

This work is devoted to the development of a biocompatible polymer-composite material based on polyetheretherketone (PEEK) with the addition of a reinforcing phase - hexagonal boron nitride (h-BN). This composite is considered as a promising material for use in medicine, for example, for the manufacture of components of a hip joint endoprosthesis or plates for fi xing fractures.

The paper considers the properties of the initial components of the material under development, studies the data on the biocompatibility of materials based on PEEK and their application in medicine, in particular, in orthopedics. Experimental data were used to study the eff ect of diff erent concentrations of h-BN on the properties of the composite. In the course of the work, the morphology and size of the particles of the starting materials, as well as the surface of the obtained samples after testing, were investigated, the dependences of the deformation-strength, tribological and biological characteristics on the composition of the composite were obtained and analyzed. A brief analysis of the results obtained is presented, as well as promising directions for the application of the developed material in orthopedics are proposed.

This work is devoted to the development of a formulation for heat-resistant glue instead of imported, used at machine-building enterprises for fi xing strain gages. The infl uence of various modifi ers on the strength characteristics of the adhesive at diff erent temperatures has been studied. The developed adhesive, which is not inferior in strength characteristics and heat resistance to the imported analog, has passed bench and full-scale tests. The selection of epoxy resins and a hardener for obtaining a heat-resistant adhesive composition was made. The infl uence of various modifi ers on the strength characteristics of adhesives at diff erent temperatures has been studied.

Products made of fl uoroplastics and composite materials based on them are widely used as structural components and sealing parts in the rocket and space industry. Therefore, they must have high physical and mechanical properties and operational characteristics. There is a need for long-term storage of parts before installation in units. One of the materials that can be used in extreme conditions: high temperatures, increased radiation and aggressive environments, is a composite material based on fl uoroplast-40 fi lled with a dispersed titanium dioxide. The article presents the results of a research which make it possible to guarantee the storage stability of the mechanical properties of fl uoroplast-40T in the workpieces for 30 years.

Samples of eight grades of polyethylene from various manufacturers: PE100 2NT11-9 (Kazanorgsintez plant); Hostalen CRP-100 with increased resistance to cracking, PE 100RC, Hostalen 4731 PG - powder (LyondellBasell); PERT I and II type Dowlex 2344 and Dowlex 2377 (Dow); PE100 P6006 AD (Sabic); PE100 H1000PC (SCG, Thailand) tested for wear according to the ISO 9352 method with the determination of the roughness and hardness of the wear mark. A range of materials with consistently decreasing wear resistance have been identifi ed. It is shown that wear occurs in layers. The presence of layers does not change the position of materials in the range of wear resistance. A decrease in the hardness of materials under the wear surface is shown. The dependence of the roughness on the grain size of the abrasive is investigated.

Magnetoplasts are the highly fi lled polymer composite materials with ferromagnetic fi ller. They are used to produce magnetic products of complex shape. The value of the residual magnetic induction is directly proportional to volume percentage of magnetic powder in the matrix and grows with an increase in the degree of orientation of the magnetic particles. The technology of obtaining magnetoplastics based on polyamide 6 and products from them is described. To realize the maximum magnetic properties, the moulding of magnets is carried out in an external magnetic fi eld. The introduction of castor oil during the moulding of products helps to increase the residual magnetic induction by improving the conditions for the orientation of magnetic particles.

A historical sketch of the development of plastic pipe production in the Russian Federation is presented. The data on the production of pressure pipes of large diameter up to 1600 mm, non-pressure pipes for sewage, with a diameter of up to 2.5 m, pressure reinforced pipes based on cross-linked polyethylene and thermoplastics are presented. The trends in the development of the production of various types of pipes are characterized and data on the specifi cs of their application are given. The technological features of enterprises are analyzed, highlighting the preferred categories of pipes produced by the enterprises in the highest quality categories.

The behavior of methacrylic copolymers with oligoethylene glycol and amine groups in aqueous solutions has been studied. The eff ect of the composition of copolymers of alkoxyoligo(ethylene glycol) methacrylates and N-[3-(dimethylamino) propyl] methacrylamide on their solubility in aqueous media, aggregation properties and surface activity at the water-oil phase boundary was demonstrated. The presence of thermo- and pH-responsive properties, characterized by lower critical solution temperature, has been shown. Polymers exhibit high interfacial activity at the water-toluene interface, which increases with an increase in the proportion of methacrylic ether units in the copolymer. For polymers in aqueous media the value of the critical micelle concentration was found in the region of 10^-3 g/L.

The effect of cobalt nanoparticles stabilized by a polyethylene matrix on the physical-mechanical and thermal properties of nanocomposites based on low density polyethylene was studied using X-ray phase (XRD) and differential thermal (DTA) analyzes.

An improvement in the strength and deformation parameters, as well as the thermal-oxidative stability of the obtained nanocomposites was revealed, which can be attributed to the effects of structural modification of the polymer matrix.

Small amounts of nanofiller introduced into the polymer play the role of structure-forming agents - artificial nuclei of crystallization, which contributes to the formation of a small-spherolite structure in the polymer, characterized by improved physical, mechanical and thermal properties of the obtained nanocomposite.

The literature data on the problems of obtaining and studying polymer composite materials, nanocomposites, dynamically vulcanized elastoplasts are presented. Phase transformations and their infl uence on the structure and properties of multicomponent polymer systems are considered.