Keyword: «polymer composite materials»

The paper presents the results of a study of polymer composite materials based on polytetrafluoroethylene (PTFE) with nanosized boron nitride with mechanical activation and ultrasonic treatment. The introduction of boron nitride with ultrasonic activation in PTFE leads to the preservation of deformation-strength properties with an increase in compressive strength by 58% and hardness by 24% compared to the initial polymer. The lowest value of the mass wear rate was obtained for the composition with ultrasonic activation while maintaining a low friction coefficient. The CLTE of composites decreases by ~2.5 times relative to the polymer matrix. It is shown that composites with ultrasonic treatment are characterized by higher mechanical and tribological properties compared to composites containing boron nitride with mechanical activation.

The article presents the results of microbiological studies of samples of polymer composite materials placed at the climatic testing site in the city of Yakutsk. A strain of psychrotolerant aerobic spore-forming bacteria of the genus Bacillus was isolated from a fragment of basalt-plastic reinforcement. Its biochemical properties and morphological characteristics have been studied. It was found that the resulting strain has fungicidal activity to some species of mold fungi of the genus Aspergillus (A. niger and A. fumigates). This property of bacteria can be used to combat the bio-infection of PCM.

The results of deformation-strength, tribotechnical and structural studies of polymer composite materials (PCM) based on activated polytetrafluoroethylene (PTFE) are presented. It is shown that the addition to PTFE of 10 wt.% activated PTFE leads to an increase in tensile strength and elongation by 20–35%. The influence of the technology of mechanical activation of the polymer matrix and fillers Sibunite and magnesium spinel on the properties of PCM is investigated. The use of activated Sibunite up to 2 wt.% as a filler of the developed polymer matrix leads to an increase in wear resistance by 56 times, activated magnesium spinel up to 2 wt.% by 27 times with indicators of deformation and strength characteristics at the level of the initial PTFE.

Composite polymeric materials are materials with designed and specified properties for use in various operating conditions and material operating environments. To obtain certain properties of CM, various methods of its manufacture and compositions of components are used. One of the modern directions in the development of CM is the production with a combination of various multilayer fibrous materials for the optimal anisotropic structure of the resulting material. To obtain increased physical, mechanical and technological properties of the resulting CM, the components of the composite, manufacturing technology and methods for modifying the binder were determined. This article substantiates the production of a hybrid CM by the infusion method for further climate testing and research into the influence of various operating environments on the CM characteristics and replenishment of the data bank to create materials used in the conditions of the North and the Arctic.

The impact of climatic factors in the conditions of the Far North and the Arctic, as shown by the work of foreign and domestic researchers, reduces the strength properties of polymer composite materials (PCM). The destruction processes occurring in the PCM under the influence of solar radiation and alternating ambient temperatures can also affect the thermophysical properties, one of the characteristics of which is thermal conductivity. The purpose of the work is to study the thermal conductivity of PCM samples under the influence of solar radiation and extreme climatic temperatures of the surrounding air.