Structure and Properties of Polymer Composites Based on Polytetrafluoroethylene and Cobalt, Titanium, and Silicon Nanoparticles

• Published in: Journal of engineering physics and thermophysics 2021-11, Vol.94 (6), p.1619-1627
• Main Authors: Baronin, G. S., Buznik, V. M., Mishchenko, S. V., Zavrazhin, D. O.
• Format: Article
• Language: English
• Subjects: Abrasive wear; Addition polymerization; Analysis; Classical Mechanics; Cobalt; Complex Systems; Composite materials; Deformation wear; Dielectrics; Electric properties; Electrical conductivity; Engineering; Engineering Thermodynamics; Fillers; Fluorides; Heat and Mass Transfer; Heat conductivity; Heat resistance; Heat transfer; Industrial Chemistry/Chemical Engineering; Infrared analysis; Infrared spectroscopy; Nanoparticles; Polymer matrix composites; Polymers; Polytetrafluoroethylene; Powders; Silicon; Structural analysis; Thermal conductivity; Thermal decomposition; Thermal resistance; Thermodynamics; Thermophysical properties; Titanium; Ultrafines; Wear resistance
• ISSN: 1062-0125; 1573-871X
• DOI: 10.1007/s10891-021-02443-1

The results of studies of the structure and properties of composite materials based on polytetrafluoroethylene and fillers consisting of composites of ultrafine polytetrafluoroethylene and titanium and silicon nanoparticles obtained by pyrolytic refining of a mixture of powders of polytetrafluoroethylene and fluorides (NH 4 ) 2 SiF 6 and (NH 4 ) 2 TiF 6 , as well as cobalt nanoparticles obtained by the method of thermal decomposition of cobalt nitrate on the surface of polytetrafluoroethylene 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 find 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 flat 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 identified depending on the type and concentration of inorganic filler 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 polytetrafluoroethylene.