The effect of ultrasonic activation on the formation of polytetrafluoroethylene modified by detonation nanodiamonds

Abstract

Abstract The article discusses the influence of low-frequency ultrasonic vibrations on the structure and tribological properties of the synthesized polymer composite material based on polytetrafluoroethylene, modified by detonation nanodiamonds. As a result of researches it is established that the effect of low frequency ultrasonic vibrations and entered a modifier of detonating nanodiamonds leads to changes the supramolecular structure of the polymer composite, expressed in the increasing the blocks size and degree of crystallinity. Studies of the elemental composition and chemical state of the atoms indicate the improvement of the composite structure, which has a better structure and contains no defects as a C-H, C-C and C-CFn ties and contains mainly of the –CF2 and –CF3 chemical bonders. Detonation nanodiamonds are introduced in the process of forming material, prevent the formation of unwanted C-H, C-C due to the absorption of excess carbon, whereby the surface of the composite material has a more perfect structure. Low frequency ultrasonic vibrations lead to the improvement of wear resistance by 13.6% and to reduce the coefficient of sliding friction is 15% of the studied composite material.