Structure and properties of polymer composite materials based on polytetrafluoroethylene and halloysite of different grades

The paper studies the effect of halloysite nanotubes of three grades on changes in the physical, mechanical and tribological properties, as well as the structure of polytetrafluoroethylene. Halloysite is a kaolinite rolled into a tube and has the chemical formula Al₂[Si₂O₅](OH)₄. The studied halloysite grades differ in textural characteristics and phase composition. It is shown that composites reinforced with halloysite demonstrate a significant decrease in the wear rate of polytetrafluoroethylene (by 400 times) while maintaining a low friction coefficient (~0.20). With an increase in the halloysite content to 5 wt. %, the elastic modulus of the material increases significantly. It is shown that the introduction of halloysite grade ANT 811 improves the relative elongation by 9 times and wear resistance by 6 times compared to halloysite grade ANT 3810. Changes in wear resistance and

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