Temperature dependences of the physical-mechanical properties of composite materials based on polytetrafluoroethylene

The Development of Methods for Forming Effective Structural Phase States in Polytetrafuoroethylene-Based Polymer Composites

“…Arrangement of the macromolecules in layers and their orientation along the directions of sliding also occur in the film of frictional transfer. Molecular orientation of this kind and the formation of a specific layered morphology of the structure were established not only in our investigations, generalised in previous monographs [3–5], but also in Demchenko et al [6]. Such an arrangement will be promoted by a state with which the average interlayer distance in the amorphous phase of the PTFE matrix is equal to lattice constant c in the crystalline phase.…”

“…X-ray diffraction investigations of the structure of PCMs [1–6] made it possible to study the structural phase transformations and physicochemical processes occurring in the surface layers in the supermolecular structure of PCMs based on PTFE with dispersed, fibre, and ultradispersed fillers in polymer–metal tribosystems owing to high-energy effects. These include:…”

“…X-ray diffraction investigations also showed that the process of friction is accompanied with amorphisation of the polymer matrix by splitting up of the crystalline regions. The transition of crystalline phase into an amorphous state characterises disordering in the structure, but during further friction it is replaced by transition of the supermolecular structure of the polymer matrix into a special state with a layered arrangement of macromolecules in the direction of certain crystallographic planes [4,5]. The ordering in the layered structure of contacting surface layers along planes (00L) is especially favourable for PCMs based on PTFE.…”

Morphology Analysis of Friction Surfaces of Composites Based on PTFE and Layered Silicates

“…Under the influence of elevated temperatures, a mobile dissipative surface structure of the composite is formed. Therefore, according to the authors [ 40 , 41 , 42 ], this explains the increase in the wear resistance of composites.…”

Imide-Containing Compositions for Tribotechnical Coatings Based on Polytetrafluoroethylene

“…Composite tribotechnical materials based on polytetrafluoroethylene (PTFE), which contain a carbon filler and a dry lubricant have been long known [1] and are being currently developed [2][3][4][5][6][7][8]. Dispersed particles of coke, carbon fiber (CF), technical carbon (carbon black), fullerenes, and carbon nanotubes are used as the carbon filler that is introduced in the amount of 0.1 up to 20 wt %.…”