Baziuk L. Thermophysical properties of solid colloidal systems based on chemically - mechanically activated nano- and micro- carbon fibers.

The thesis is dedicated to the investigation of thermophysical, physical, mechanical and tribological properties of solid colloidal systems that consist of a dispersion medium - temperature resistant polymers, dispersed phase - carbon fibers and graphite powder, coke and solid inorganic materials. The dependence between the size of the dispersed phase, their shape and size distribution, degree of graphitization, thermal conductivity of the dispersed phase and the thermal conductivity of solid colloidal system based on polytetrafluoroethylene, aromatic polyamide and polyimide have been investigated. Thermal properties of solid colloidal systems based on polymers temperature resistant depending on the temperature and concentration of the dispersed phase have been highlighted. The theoretical analysis of the results of calculations of thermal conductivity of solid colloidal systems with different dispersed phases has been made. Methods of mathematical planning of the experiment and the search for optimal solutions using the obtained regression equations have revealed dependence of the thermal conductivity and the wear rate of the material with content of it in the graphite, carbon and basalt fiber. It is shown that the tensile strength, elongation at break and impact strength relative solid colloidal systems based on polytetrafluoroethylene depend on the parameters of the distribution of carbon fiber for lengths and technology for such a system. The dependence of the wear resistance of solid colloidal systems based on aromatic polyamide on the parameters of the theoretical distribution of graphite particles compared with discrete distribution has been analyzed. The model of abrasive solid colloidal systems based on polymers comprising spherical and ellipsoidal particles has been created. The new criterion for optimizing the parameters of plastic and elastic properties of solid colloidal systems, which were calculated basing on the properties of the initial components has been introduced. It is shown that in the coordination between the agreement criterion and abrasive wear resistant there is statistically reliable linear relationship.