DISPERSED POLYOXADIAZOLE MODIFIER FOR ANTIFRICTION PHENOLFORMALDEHYDE TEXTOLITES

Antifriction polymer composite materials based on phenol-formaldehyde resole binders, reinforced with textile-combined polyoxadiazole and cellulose fibers, have high tribological and physical-mechanical properties. This opens up prospects for solving a wide range of problems in the design of friction units of machines and mechanisms with an extended service life. However, when processing these materials into finished products, technological difficulties arise that limit their use. The use of a dispersed modifier simplifies the technology for producing polymer composite materials. By grinding polyoxadiazole fibers in a ball vibration mill, a new type of anti-friction dispersed modifier of phenol-formaldehyde binders was obtained. In accordance with the data of diffractometric analysis, when grinding polyoxadiazole fiber, there is a slight decrease in its crystallinity, which has virtually no effect on the physical and mechanical properties of the material. The resulting dispersed modifier is a mixture of short fragments of deformed polyoxadiazole filaments and flaky polyoxadiazole particles of irregular shape, the size of which reaches 200-250 µm. X-ray photoelectron spectroscopy data indicate an increase in the nitrogen content in the resulting powdered product compared to the original polyoxadiazole fiber. The introduction of a powdered polyoxadiazole modifier into a phenol-formaldehyde binder for cotton textolites ensured the production of self-lubricating wear-resistant antifriction polymer composite materials with good tribological properties. A decrease in the coefficient of friction, wear and temperature in the friction contact zone is observed (under conditions of dry friction on a steel counterbody). The samples of the studied materials with a small content of polyoxadiazole modifier (5% wt.) in the phenol-formaldehyde binder have the best tribological characteristics. The properties of the resulting materials are due to polymer composite materials reinforced with a fabric combination of fibers, polyoxadiazole and cellulose. For citation: Panova M.O., Buyaev D.I., Shaposhnikova V.V. Dispersed polyoxadiazole modifier for antifriction phenolformaldehyde textolites. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 11. P. 79-85. DOI: 10.6060/ivkkt.20246711.7051.