STRUCTURE AND PROPERTIES OF POLYMER COMPOSITES BASED ON POLYTETRAFLUOROETHYLENE AND COBALT, TITANIUM, AND SILICON NANOPARTICLES

The results of studies of the structure and properties of composite materials based on polytetrafl uoroethylene and fi llers consisting of composites of ultrafi ne polytetrafl uoroethylene and titanium and silicon nanoparticles obtained by pyrolytic refi ning of a mixture of powders of polytetrafl uoroethylene and fl uorides (NH₄)₂SiF₆ and (NH₄)₂TiF₆, as well as cobalt nanoparticles obtained by the method of thermal decomposition of cobalt nitrate on the surface of polytetrafl uoroethylene microgranules, are presented. Investigations carried out by the x-ray structure analysis, x-ray phase analysis, and IR spectroscopy methods have made it possible to fi nd the composition and structure of nanoparticles containing Co, Ti, Si and their interaction with the polymer matrix. In addition, the dielectric and thermophysical properties of the composites obtained were studied. Using the methods of differential scanning calorimetry and plotting the isometric heating diagrams, the heat resistance and internal orientational stresses were determined. The thermal conductivity data was obtained using an information and measuring system of nondestructive control of the thermophysical properties of solid materials. Measurements of the permittivity of composites were performed by the noncontact method in a fl at condenser, and the wear resistance was estimated in the mode of abrasive wear. As a result of the studies carried out, the characteristic features of the properties of composites were identifi ed depending on the type and concentration of inorganic fi ller and the technology of obtaining composites. Some of the characteristics of the created composites (deformation heat resistance, thermal conductivity, and wear resistance) exceed those of the starting polytetrafl uoroethylene.
   
Author:  G. S. Baronin, V. M. Buznik, S. V. Mishchenko, and D. O. Zavrazhin
Keywords:  nanocomposites based on fl uoropolymer; cobalt, titanium, and silicon nanoparticles; tribotechnical, thermophysical, and dielectric properties.
Page:  1619