POLYMER COMPOSITE MATERIALS BASED ON POLYTETRAFLUOROETHYLENE FILLED WITH MODIFIED MONTMORILLONITE

E.V. Abakunova, S.N. Danylova, S.A. Sleptsova, A.A. Okhlopkova
DOI: 10.25699/SSSB.2021.40.6.005 Download PDF
Abstract: The development of modern technology requires the search for new structural materials that surpass traditional ones in their deformation-strength, elastic and wear-resistant properties. Composite materials based on PTFE are very promising structural materials for many industries. PTFE is widely used in friction units of technical systems due to its operability in a wide temperature range while maintaining low and stable values of the coefficient of friction, as well as its ability to provide self-lubrication during friction. Such disadvantages of PTFE as cold flow, low wear resistance, high coefficient of thermal expansion are eliminated by modification, one of the common methods of which is filling. The paper focuses on the effect of organomodified mechanically activated montmorillonite (OMMT) of 101/102 grade on the physical and mechanical characteristics and structure of polytetrafluoroethylene. The filler content varied from 0.5 to 7 wt. %. With the introduction of 0.1-5.0 wt. % OMMT in PTFE, the strength of PCM increases by 35%, and the elongation by 21% was found. Structural studies have registered the transformation of the supramolecular structure of PTFE with the formation of spherulite-like formations, the centers of crystallization of which are particles of OMMT. For these filler concentrations, higher values of the enthalpy of melting and the degree of crystallinity were established by the method of differential scanning calorimetry.
Index terms: polymer composite material; polytetrafluoroethylene; organomodified mechanically activated montmorillonite; organoclay; physical and mechanical properties; supramolecular structure; enthalpy of melting; degree of crystallinity.

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