The Influence Of TiO₂Particle Sizes To Structure And Performance Of PI Composite Films

Organic/inorganic nano-composite films have excellent electrical, optical,thermal, mechanical and other performance, widely used in the field of electricalengineering. Nowadays, it is unclear that the Influence of particle sizes to structureand performance of PI/TiO2composite films. This paper utilizes different sizes TiO2particles of PI/composite films to analyse the Influence of particle sizes to thestructure and performance testing of PI/TiO2composite films.This article utilizes different sizes TiO2particles(15nm,20nm,25nm), differentcomponent(5wt%,7wt%,10wt%and15wt%) of PI/TiO2composite films. UsingSEM, TEM analyses the structure surface topography of the particles and thecomposite films, and analyses particle shape and the two-phase distribution; By XRDcrystallinity and crystal orientation of the films were characterized, the type of thebinding of the particles is analyzed, and by calculating the particle size of the filmwere determined. The application of TGA instrument, dielectric spectroscopy, UVabsorption spectroscopy and corona resistant equipment test thermal stability,dielectric properties and corona aging life of composite films, and analyse theInfluence of particle sizes to the structure and performance testing.The results show that due to the impact of surface state and surface energy tothe particle size, the smaller the particle size, the greater the number density, thegreater the total surface area, inorganic nanoparticles and PI matrix form a morestable structure; As the nano-particle size decreases, thermal stability of thecomposite film is enhanced, organic/inorganic phase interface layer is formed with aspecial structure and reduces the diffusion rate of temperature field, while it largelyincreases the number of particle density and particle collisions opportunities,uniforms heat distribution of the film; At the same time, the number of interface trapsand the carrier mobility increase, the system permittivity and conductivity becomeslarge, dielectric loss becomes small and resistance corona life improves. The smallersize of inorganic nanoparticles, more intensive distribution, smaller particle spacingmore closely spatial structure, producing large amounts of organic-inorganic phase interface layer structure plays a role in slowing, blocking, consuming electrontransport in the the electron transport.