Polyamide PA Research Articles

Analysis of the Surface Topography of Fractures Caused by Static and Impact Bending of Polypropylene and Polyamide PA6 Reinforced with Continuous Glass Fibers

Analysis of the Surface Topography of Fractures Caused by Static and Impact Bending of Polypropylene and Polyamide PA6 Reinforced with Continuous Glass Fibers

Revealing patterns of change in the tribological efficiency of composite materials for machine parts based on phenylone and polyamide reinforced with arimide-t and fullerene

The object of the study is the process of changing tribological efficiency according to tribotechnical characteristics (wear intensity, friction coefficient, temperature in the contact zone) of composites based on phenylone C-1 and polyamide PA-6 with arimide-T filler and fullerene C-60. The study solved the problem of obtaining composites with high wear resistance. Based on the results of research, it was found that varying the content of arimide-T makes it possible to obtain composites with different patterns of changes in tribotechnical characteristics under conditions of dry friction, lubrication with water and I-50 oil. Composites with the composition: phenylone C-1+15 wt. have the maximum tribological efficiency. % arimide-T+3 wt. % fullerene C-60 and polyamide PA-6+30 wt. % arimide-T+3 wt. % fullerene C-60. Phenylone C-1 has destructive properties when working in the environment of water and temperature in the friction zone. Its reinforcement with arimide-T and fullerene C60 gave positive results of a complex of tribotechnical characteristics under these conditions. It was found that the wear of composites based on phenylone C-1 in I-50 oil is two orders of magnitude lower than in water. Research of samples from the obtained composites based on phenylone C-1 and polyamide PA-6, reinforced with the optimal content of arimide-T and fullerene C60, showed that their wear resistance when lubricated with oil is 3.5...4.0 times greater than the wear resistance of bronze. An applied aspect of the reported results is the introduction of manufacturing technologies and restoration of machine parts from the proposed composites. It has been proven that their optimal composition contributes to high tribological efficiency and could provide the required level of wear resistance and reliability of resource-determining nodes, systems, and machine assemblies. The results could be used by machine-building and repair-technological enterprises

Exploring innovative synthetic solutions for advanced polymer-based electrochromic energy storage devices: Phenoxazine as a promising chromophore

The current investigation offers an innovative synthetic solution regarding electrochromic (EC) and energy storage applications by exploring phenoxazine (POZ) moiety. Subsequently, three POZ-based polymers (polyimide, polyazomethine, and polyamide) were synthesized to ascertain the superior performer. The polyamide exhibited remarkable attributes, including high redox stability during 500 repetitive CVs, optical contrast of 61.98%, rapid response times of 1.02 and 1.38 s for coloring and bleaching, EC efficiency of 280 cm2 C−1, and decays of the optical density and EC efficiency of only 12.18% and 6.23% after 1000 cycles. Then, the energy storage performance of polyamide PA was tested, for which the following parameters were obtained: 74.7 F g−1 (CV, scan rate of 10 mV s−1) and 118 F g−1 (GCD, charging current of 0.1 A g−1). Then, the polyamide was tested in EES devices, which yielded the following EC parameters: an optical contrast of 62.15%, response times of 9.24 and 5.01 s for coloring and bleaching, EC efficiency of 178 cm2 C−1, and moderate decays of 20.25% and 23.24% for the optical density and EC efficiency after 500 cycles. The energy storage performance included a capacitance of 106 F g−1 (CV, scan rate of 0.1 mV s−1) and 9.23 F g−1 (GCD, charging current of 0.1 A g−1), capacitance decay of 11.9% after 500 cycles, and 1.7 V retention after 2 h. Also, two EES devices connected in series powered a 3 V LED for almost 30 s.

High injection molding welding strength and cross-sectional analysis of carbon fiber composite materials

In this study, carbon fibers, commonly used as reinforcement materials, were added to polyamide (nylon) PA6 to fabricate carbon fiber-reinforced thermoplastic composites (CFRTP), which were then subjected to injection molding welding. The aim of this research was to investigate the positive influence of carbon fibers on injection molding welding strength and explore the optimal injection conditions. Three different joining combinations and various injection parameters were examined. The tensile fracture surfaces after welding were observed using polarized microscopy and scanning electron microscopy. The reinforcing mechanism of carbon fibers was analyzed. Ultimately, the optimal conditions were determined as a mold temperature of 120°C, an injection temperature of 380°C, and an injection velocity of 150 mm/s. The addition of carbon fibers exhibited significant strengthening effects on the injection molded joints, and it also provided the potential for injection molding welding between resins with poor compatibility.

Investigation of Wear Resistance of Polyamide PA6 Based Composite Materials for Metal - Polymer Plain Bearings and Gears

Metal-polymer plain bearings and gears are becoming increasingly used in many areas of human activity. The wear resistance of one group of such materials - unreinforced polyamides PA6, PA66, and composites with fillers РА6+30GF, РА6+30CF, РА6+MoS2, РА6+Оil was studied. To determine their wear resistance indicators the author's method of model triboexperimental research according to the scheme of end friction at dry sliding friction paired with carbon steel (0.45%C) is used. According to the determined wear resistance indicators, are calculated as the basic parameters of the author's mathematical model of materials’ wear kinetics at sliding friction and the analytical method of the research of specified friction units. Based to the research, polymeric materials’ wear resistance diagrams are plotted as graphical indicators of wear resistance in the accepted range of specific friction forces. The qualitative and quantitative influence of the type and structure of the fillers on the wear resistance has been established. Qualitatively, the nature of the change in wear resistance of the indicated types of polyamides is similar, quantitatively the difference is significantly differentiated. It was found that PA6+Oil has the highest wear resistance compared to the РA6. It consistently increases in the following sequence: PA66, РA6+30GF, РA6+MoS2, РA6+30CF, РA6+Oil.

Distribution and reinforcement effect of carbon fiber at the interface in injection welding of polyamide 6 composites

AbstractTo meet the lightweight production requirements of automobiles and achieve high strength, reinforced thermoplastic composite materials are gradually replacing metal materials. Injection molding is the preferred manufacturing method to enable the production of complex‐shaped parts, facilitate production, and reduce costs. In this study, carbon fiber (CF) was added to the commonly used resin‐reinforcing material, polyamide (nylon) PA6, to create a CF‐reinforced thermoplastic composite (polyamide 6 [PA6]/CF) that was welded using injection molding. This study not only investigates the impact of different welding conditions on shear strength but also discusses the sequence of welding. Achieving 85% of the shear strength of the PA6 base material under ideal circumstances. The CF distribution and reinforcement mechanism were analyzed by observing the connection interface and cross section using a polarizing microscope and a scanning electron microscope. When PA6/CF was used as the secondary molded body, the welding results were better. The addition of CF had a significant strengthening effect on the strength of the PA6 injection welding.Highlights Carbon fiber‐reinforced thermoplastic composite materials were prepared, and welding with PA6 was achieved using the injection molding method. The optimal welding parameters were determined by varying the mold, injection speed, injection temperature, and order of injection. The maximum welding shear strength reached 85% of the base material shear strength. The positive effect of specific fiber distribution on welding strength was analyzed by observing the interface using a scanning electron microscope and a polarizing microscope. This study provides valuable insights into the optimization of welding processes for carbon fiber thermoplastic composite materials, offering possibilities for connecting dissimilar materials with poor compatibility.

Pyrolysis acetylation: A novel on-line Py-GC-MS derivatisation for the characterisation of nitrogen-containing polymers

Several on-line chemical reactions have been combined with Py-GC-MS to improve the chromatographic behaviour of polar pyrolysis products. Derivatisations, principally methylation and silylation, have been widely employed to the analysis of oxygenated pyrolysis products, while the conversion of nitrogen-containing compounds resulted more challenging. The present study shows that amines can be efficiently converted into the corresponding N-substituted amides (acetamides) by conducting pyrolysis in the presence of acetic anhydride (PyAc). PyAc was assessed on three common N-containing polymer families, polyethylenimine (PEI, linear and branched), polyurethane (PUR, based on the methylenediphenyl diisocianate monomer) and nylons (polyamide PA6 and PA66). Upon PyAc, PEI produced a series of N-methyl, ethyl, ethenyl acetamides indicative of the formation of several alkylated monoamines that were more difficult to detect in the free form by conventional Py-GC-MS. Acetyl derivatives of linear acyclic polyamines and piperazines were also identified confirming previous investigations. In the case of PUR, the acetylated 4,4′-diaminodiphenylmethane was generated along with the diisocyanate monomer. PyAc of PA66 produced the acetyl derivative of 1,6-hexyldiamine, while the caprolactam of PA6 was only partially acetylated. The effectiveness of acetylation was confirmed by PyAc of calibration standards for microplastic analysis. Besides the acetylated amines distinctive of PUR and PA66, the acetylated forms of 1,4-butandiol from PUR and bisphenol A from polycarbonate were detected. The results showed the potential of extension of PyAc to other polymer families and highlighted some weaknesses to be solved.

Selective laser sintered Pipe Ring Notched Tension specimens for examination of fracture properties of pipeline materials

In order to develop a non-standard method for determining the resistance to fracture and damage of pipeline materials, a new geometry of ring-shaped specimens with sharp notches or cracks has been defined. The need to develop a new method for testing of the specimens cut from the pipes arises due to the difficulties in determination of fracture mechanics parameters on thin-walled pressure pipelines, especially those with a smaller cross-section, by application of the standard procedures/specimens. Previous studies dealing with the topic of pipeline testing by non-standard methods are presented in the introductory part of the paper. In the experimental part of the research, tests on PRNT (Pipe Ring Notched Tension) and SENT (Single Edge Notched Tension) specimens are performed. Samples of these specimens were produced by SLS (Selective Laser Sintering) technique of additive production from PA12 (polyamide PA 2200) material. For the purpose of this study, a tool that is protected at the national level (in Serbia) as intellectual property is used for testing of the ring-shaped PRNT specimens. Tensile testing of both types of specimens is monitored by Aramis GOM 2M system; its operation is based on the method of digital image correlation, DIC. Additionally, finite element analyses are conducted on the PRNT and SENT geometries, enabling the calculation of the fracture mechanics parameter – Stress intensity factor K. It is concluded that the presented procedure based on the PRNT specimen has a good potential for use as a non-standard method for fracture resistance examination of pipeline materials. It can be performed on the specimens cut directly from the pipes (new or from exploitation). The dependence of the fracture resistance on the stress concentrator size is not pronounced, which means that the results depend dominantly on the material properties, rather than on geometry.

Anisotropic flexure hinges: Manufacturing and mechanical characterization for application in pressure-actuated morphing structures

Shape-morphing structures based on pressure actuation promise efficiency gains and performance improvements in aeronautics, but require complex three-dimensional geometries. The compliance of these morphing structures originates from local areas of reduced wall thickness. However, the required high wall thickness ratios are challenging for integral fabrication from high-performance fiber-reinforced plastics, which are demanded to achieve high load-bearing capacity. This study investigates different woven flexure hinges made from a hybrid yarn of glass fibers and the polyamide PA6 for application in pressure-actuated cellular structures. The flexure hinges are mechanically characterized under pure axial and pure bending loading in a tensile and a column bending test method specifically derived for flexure hinges. The specimen quality is further assessed by permeability testing, optical microscopy, and thermogravimetric analysis. This study shows that the stiffness of anisotropic flexure hinges can be determined in simple mechanical tests without the need for complex modeling of reinforcing fibers or consideration of manufacturing-specific effects. The mechanical properties of a double-layer hinge configuration are superior to those of a single-layer configuration, whereas integrating additively manufactured PA6 inlays into the woven preform offers an effective approach for achieving high wall thickness ratios. The most promising hinge configuration is selected for the integral fabrication of the aeronautical morphing structure, which consists of multiple pressurized cells.

New insights into contribution of aromatic ring versus aliphatic ring to thermal transition temperatures of heat resistant polyamides: A comparison study of PA 10T and t-PA 10C

In order to understand the differences in the contribution of aromatic (p-phenylene) ring versus aliphatic (trans-1,4-cyclohexylene) ring to the thermal transition temperature of heat-resistant polyamides, a comparison study is both experimentally and computationally implemented on a typical aromatic-heat-resistant polyamide PA 10T containing p-phenylene moieties and a typical alicyclic-heat-resistant polyamide t-PA 10C containing trans-1,4-cyclohexylene moieties. DSC, WAXD, solid state-NMR, computational simulations, and in-situ FTIR were utilized in sequence to reveal the differences in thermal performance, crystal structure, chain conformation, cohesive energy, interchain interaction, and melting process of PA 10T and t-PA 10C. t-PA 10C displays 30 °C-higher Tm and 50 °C-higher Tg than PA 10T. As indicated by the hydrogen bonding dissociation process, the enthalpy change dominates the difference in Tm as the gap in the entropy change between PA 10T and t-PA 10C is negligible. Computational simulation indicates that the energy-favorable hydrogen bonding conformation and dense trans-1,4-cyclohexylene-associated chain packing endow the formation of stronger interchain interactions in t-PA 10C which results in larger cohesive energy and greater cohesive energy density. The higher melting enthalpy change in the melting process derived from in-situ FT-IR experiment also verifies the simulated energy results. Henceforth, the question that WHY can the building block change, from rigid planar aromatic unit (PA 10T) to conformation-switchable nonplanar aliphatic unit (t-PA 10C), in the two polyamides induce so large improvement in Tg and Tm is systematically answered.

Tribotechnical characteristics of polyamide PA 6 with additives of molybdenum disulfide and graphite

The paper presents the results of tribotechnical tests of polyamide PA 6 with additives of molybdenum disulfide and graphite in comparison with nitrile butadiene rubber, BNC rubber. The influence of the surface roughness of a 40X steel counter-tile on the friction coefficients from pressure is considered and the jamming loads from the sliding speed are determined. The tests were carried out on a friction machine with a vertical axis of rotation of the spindle according to the “plane-ring” scheme when the friction pair was lubricated with MGE-10A hydraulic oil. The test loads and sliding speeds were changed stepwise. It has been found that with a decrease in the surface roughness of samples of polymer materials, the friction coefficients decrease. Samples with graphite additives had the best indicators for reducing the coefficient of friction from pressure, followed by samples with molybdenum disulfide and PA 6 without additives. The bully resistance of graphite samples is 2 times higher than that of BNC samples. The samples with molybdenum disulfide were slightly inferior to the samples with graphite, but were better than PA 6.

Comparison of Load-Carrying Capacity, Wear, and Resource of Metal-Polymer Corrected Spur Gears with a Gear Made of Polyamides РА6 or PA6+30CF

Based on the developed calculation research method of metal-polymer gears the analysis of the influence of height and angular correction of engagement of spur gears on load-carrying capacity, linear teeth wear, and resources is carried out. Gears with a pinion made of carbon steel 0.45%C and a gear made of basic polyamide PA6 or carbon fibre composite PA6 + 30CF were investigated. Quantitative and qualitative patterns of influence of both types of correction, changes in the initial teeth profile due to wear, mating conditions on the load carrying capacity, teeth linear wear, and service life of investigated metal-polymer gears have been established. Profile correction causes a decrease in the contact pressure in the engagement by different amounts during the meshing cycle. They are most significantly reduced in the input area of two-pair engagement. It was found that when using PA6 + 30CF, the maximum contact pressures are about 1.29 times higher than with PA6 at all values of the shift coefficients, regardless of its type. The tooth linear wear has different values during the meshing cycle depending on the shift coefficients and parity of engagement. The resource first increases with increasing the shift coefficients, reaching their optimum, and then decreases again. Regularities of this influence for each type of correction of engagement are established. Metal-polymer gears with a gear made of PA6 + 30CF will have a significantly higher service life than with a gear made of PA6.

Comparative thermal analysis of coal fuels, biomass, fly ash and polyamide

The paper presents a tally of the results of thermal analysis TG/DTG/DSC of selected fuels (hard coal, agro biomass and forest biomass), waste (coal sludge, fly ash), quartz sand with the organic material, and recyclate of polyamide PA6. The materials differ in composition and calorific values. The aim of the study was a complex comparative analysis of the tested materials inthe scope of potential use of coal fuels, biomass and coal waste to create polymer composites, as well as thermal co-utilization of polymer waste, and energy recovery from plastic waste. The thermal analysis permits to illustrate the change of a sample mass and to obtain information at what temperature ranges these changes occur. It also enables to notice whether any changes related to heat absorption or release take place in the tested substance, as well as identify exothermic and endothermic effects during thermal process.The authors stated that the changes of values on the DSC, TG and DTG curves of the tested materials during the thermal process result mainly from their primary composition. The analyzed quartz sand with organic substance, and fly ash, show the lowest exothermic effects in the air atmosphere, in contrast to other tested materials, due to low carbon content and volatiles matter. Among the considered fuels: hard coal, coal sludge, biomass, coal has the highest carbon content and calorific value, which is reflected in the maximum DSC values.

Comparative Investigation on Improved Aerodynamic and Acoustic Performance of Abnormal Rotors by Bionic Edge Design and Rational Material Selection.

Rotor plays a vital role in the dynamical system of an unmanned aerial vehicle (UAV). Prominent aerodynamic and acoustic performance are a long-term pursuit for the rotor. Inspired by excellent quiet flight characteristics of owls, this work adopted bionic edge design and rational material selection strategy to improve aerodynamic and acoustic performance of the rotor. A reference model of rotor prototype with streamlined edges was firstly generated by reverse engineering method. With inspiration from owl wings and feathers, bionic rotors with rational design on leading and trailing edges were obtained. Original and bionic rotors were fabricated with polyamide PA 12 and Resin 9400 by 3D printing technique. Aerodynamic and acoustic performance of the as-fabricated rotors were experimentally measured and analyzed in detail using a self-established test system. Comparative experimental results indicated that the aerodynamic and acoustic performance of the rotors was closely related to the bionic structures, material properties, and rotational speeds. At the same rotational speed, bionic rotor fabricated with Resin 9400 can produce a higher thrust than the prototype one and its power consumption was also reduced. The resulting noise of different bionic rotors and their directivities were comparatively investigated. The results verified the bionic edge design strategy can effectively control the turbulent flow field and smoothly decompose the airflow near the tailing edge, which resulting in enhancing the thrust and reducing the noise. This work could provide beneficial inspiration and strong clues for mechanical engineers and material scientists to design new abnormal rotors with promising aerodynamic and acoustic performance.

Change in elastic modulus during fatigue bending and torsion of a polymer reinforced with continuous glass fibers

The paper emphasizes the fact that in the case of composite materials which are characterized by anisotropy, unlike classic isotropic materials, the modulus of elasticity changes its value when the degree of damage changes. Moreover, a decrease in this modulus can characterize the degree of material damage. The literature on this phenomenon was analyzed. However, the vast majority of studies leading to the description of changes in the stiffness of the material have so far been carried out only for uniaxial tension–compression. One case was also found where the authors performed a similar analysis for the material subjected to torsion. It was found that such analysis has not yet been performed for pendulum bending, which is a very common type of load in structural elements. Based on the authors’ own experimental research for cyclic pendulum bending and double-sided torsion of specimens made of polyamide PA6, reinforced with continuous glass fibers, it was found that, as in the case of uniaxial tension–compression, as the degree of damage increases, there is also a decrease in both Young's modulus for bending and the shear modulus for torsion.

Structural and Optical Characterizations of Cadmium Chalcogenide Layers on Polyamide Formed Using Monotelluropentathionic Acid.

Mixed cadmium tellurides–cadmium sulfide thin layers were formed on the polyamide PA 6. Monotelluropentathionic acid (H2TeS4O6) was used as a precursor of tellurium and sulfur. A low-temperature, nontoxic, and cost-effective SILAR method was applied. Cadmium telluride (CdTe) and sulfide (CdS) layers were formed through the consecutive reactions of sorbed/diffused chalcogens species from telluropentathionate anion (TeS4O62−) with functional groups of polyamide and alkaline cadmium sulfate. The pseudo-second-order rate and Elovich kinetic models were the best fit to quantify an uptake of chalcogens and cadmium on PA 6. The effects of chalcogens and Cd on the structure and optical properties of PA 6 were characterized using UV-Vis and IR spectra. The clear changes of these properties depended on the concentration and exposure time in the precursor solutions. Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy were applied in order to evaluate the effect of the chalcogen species on the changes in structure of polyamide 6 films, depending on the exposure time in the solution of the chalcogens precursor and its concentration. The optical bandgap energy of the formed layers was found to be in the order of 1.52–2.36 eV. Studies by scanning electron microscopy and atomic force microscopy reveal that the diameter of the average grain is approximately 30 nm. The grains are conical in shape and unevenly distributed all over the surface of the substrate.

Study of the Influence of Temperature on Contact Pressures and Resource of Metal-Polymer Plain Bearings with Filled Polyamide PA6 Bushing

It is known that the elastic characteristics of polyamides change with increasing temperature; in particular, the Young’s modulus decreases significantly. This fact is practically not taken into account in design calculations of metal-polymer plain (MP) bearings, operating under conditions of the boundary and dry friction. The purpose of the study was the analysis of the effect of temperature on the change of the Young’s modulus and, accordingly, the contact strength and triboresource according to the developed method of calculating MP bearings. MP bearings with a bushing made of polyamide PA6 reinforced with glass or carbon-dispersed fibers were investigated. Quantitative and qualitative regularities of change of the maximum contact pressures and resource of the bearings at temperature increase under conditions of boundary and dry friction are established. The pressures in the bearing bushing made of PA6 + 30GF will be lower than for the bushing made of PA6 + 30CF. The resource of the bushing made of PA6 + 30CF will be significantly greater than for PA6 + 30GF. For thermoplastic polymers, the increase in temperature will have a useful practical effect due to the decrease in the rigidity of the polymer composites of the bearing bushing.

Modeliranje nosivosti i izdržljivosti metal-polimerskih zupčanika na bazi poliamid pa6 kompozita

Based on the author's method of calculation of metal-polymer (MP) gears, the study of load carrying capacity and durability of metal-polymer spur gears with a gear made of unfilled polyamides PA6, PA66, and polyamide PA6 based composites filled with glass (PA6 + 30GF) or carbon (PA6 + 30CF) fibers, molybdenum disulfide (PA6 + MoS2) oil-filled cast polyamide (PA6 + Oil) is performed. The conditions of the teeth engagement and the change of the radiuses of curvature of the involute profile during wear are taken into account. The calculation of the maximum contact pressures during the cycle of teeth interaction - from the entrance to the engagement to the exit from it is performed. The effect of tooth wear on their reduction is also studied. The linear wear of polymer teeth at the selected points of a profile and the characteristic point where the acceptable value is reached (at two-pair or one-pair engagement) is established. The gear's durability is calculated and their comparative estimation is given. Qualitative and quantitative regularities of change of the specified service characteristics of MP gears at the achievement of the acceptable wear of polymeric gear teeth are established.

ИССЛЕДОВАНИЕ ВЛИЯНИЯ АНТИПИРЕНОВ НА ГОРЮЧЕСТЬ И ПОКАЗАТЕЛЬ ТЕКУЧЕСТИ РАСПЛАВА АЛИФАТИЧЕСКИХ ПОЛИАМИДОВ

The paper presents the results of a study of the effect of fire retardants on the flammability and melt flow rate of aliphatic polyamides of the PA 66L, PA 610L, PA 66KS grades. The degree of this influence depends on the grade of polyamide, the type of fire retardant and its quantitative content. Among the selected grades of polyamides, polyamide PA 66L has the highest fluidity. The efficiency of using decabromodiphenyloxide and antimony trioxide to reduce the duration of residual combustion of polyamides of the studied brands is shown, compositions related to the category of «self-extinguishing» are determined.

TRIBOLOGICAL CHARACTERISTICS OF ANTIFRICTION COMPOSITES OF POLYAMIDE AND ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE

Analysis of current trends in improving the designs of tribo-couplings of agricultural machinery has shown that the use of polyamide 6 as an antifriction material is limited by its low moisture resistance, which leads to a significant deterioration in its elastic-strength and tribological characteristics during moisture saturation. The paper shows the possibility of using ultra-high molecular weight polyethylene as its analogue, which allows increasing the durability of tribo- couplings of hydraulic systems of agricultural machinery. (Research purpose) The research purpose is in to study the processes of friction and wear of polyamide PA 6 composites and ultra-high molecular weight polyethylene nanocomposites with obtaining dependencies linking tribological characteristics (friction coefficient and wear intensity) with operational factors (temperature, sliding speed and contact pressure). (Materials and methods). Polyamide PA 6 of the 210/310 brand was used in the work; composite of the UPA 6-15A brand, consisting of 85 percent polyamide PA 6 and 15 percent fibrous carbon filler; ultrahigh molecular weight polyethylene of the GUR 4120 brand; Tuballmatrixbeta concentrate of activated carbon nanotubes; hydrophobic nanocrystalline silicon dioxide with a dispersion of 20 nanometers, Nafen grade aluminum oxide nanofiber with a dispersion of 10- 20 nanometers. Samples were made to study the elastic-strength and tribological characteristics of composites by thermal pressing on a Gibitre hydraulic press. Samples were tested on the UAI-7000 M bursting machine and the Haake MARS III rheometer. (Results and discussion) The values of the intensity of linear wear and the dependence of the friction coefficients of composites on the sliding speed, contact pressure and temperature of industrial oil I-20A were determined for the conditions of dry friction and friction with lubrication. (Conclusions) The research results have shown that the use of ultrahigh molecular weight polyethylene and nanocomposites based on it as commercial antifriction materials of tribo- couplings is promising and requires further study.