Keyword: «polyethylene»

The paper shows the possibility of processing composites based on UHMWPE by extrusion by adding a low-viscosity grade of polyethylene and stearic acid. It is shown that the best indicators of physico-mechanical properties and dynamic viscosity coefficient are achieved for PCM based on UHMWPE with the introduction of 5 wt. % polyethylene and 5 wt. % stearic acid. The possibility of modifying such composites with fibers and processing them using extrusion technology has also been established, which, with further refinement of the technology, will improve the operational properties of the composite based on UHMWPE and PE.

The results of a study of the conditions and duration influence of the carbon nanofibers (CNF) synthesis on the physico-mechanical characteristics of polyethylene composites based on them are presented. CNF were obtained by the catalytic pyrolysis of hydrocarbons. It has been established that the introduction of CNF doped with nitrogen leads to decrease in the deformation-strength characteristics of the composite. Samples of composites containing CNFs with the shortest synthesis time (up to 40 min) were characterized by the best abrasive resistance.

The article presents the results of a study of the effect of the CO-4 stabilizer on the processes of degradation of high-density polyethylene when it is exposed to ultraviolet (UV) radiation by infrared (IR) spectroscopy. It has been shown that the absence of a stabilizer in the polymer leads to a decrease in the amount of vinyl groups. It is assumed that vinyl groups in samples without a stabilizer interact with alkyl radicals, which are formed during UV irradiation.

The article presents the results on the selection of the composition of new materials for the production of fuel cans. The choice of components was carried out in order to ensure the import substitution of raw materials currently used on the technological line of Sakhaneftegazsbyt JSC. The developed materials are characterized by the required level of physical, mechanical and electrical conductive properties, and are also resistant to the influence of transported media and climatic factors of the Republic of Sakha (Yakutia).

The article presents the results of a study of polyethylene samples exposed to natural climatic factors for 18 months by Raman spectroscopy. The spectra were obtained at different depths from the sample surface and it was shown that the stages of material degradation depending on the depth have different degrees. An estimate of the degree of degradation from depth is given, according to which the material undergoes structural changes most intensively at a distance of up to 40 µm from the surface. At depths greater 80–100 µm, structural changes in the material are not detected.