Molecule Simulation And Characterization Of Nanohybrid Films Microstructure And Electronical Properties

The microstructure of the film, distribution, shape and size of inorganic nanoparticle in hybrid PI film prepared by sol-gel method and Dupont 100 CR film have been studied by means of XRD, SAXS, SEM, TEM and materials structure and property simulation soft. Under UC step electrics field, the breakdown property and mechanism of Dupont 100 CR and 100 HN have also been studied.The electrons structure, geometric structure and energy state of PI and nanohybrid PI have been studied by Materials Studio. The results show that the whole energy of PI/α -Al₂O₃ system is more lower than that of PI/SiO₂ under the basic of the lowest energy and optimized geometric structure. The energy of Van der Waals of PI/α -Al₂O₃ is higher 10 times than that of PI/SiO₂, thus the system of PI/α -Al₂O₃ is more stable than that of PI/SiO₂, and the conclusions are consistent with the experiment results.SEM and TEM observations show that the nanohybrid films prepared by sol-gel contain SiO₂ clusters and A1₂O₃ particles. Under the high energy electron beam bombarding, compared with the structure of SiO₂ clusters decomposed, the structures of Al₂O₃ particles are rather stable. The SAXS analysis show that the fractional dimensions of the film is larger than the theory value of Diffusion Limited Aggregation (DLA) and the clusters consist of a great number of small particles.The measuring results of SEM, TEM and XRD show that Dupont 100CR films only contain Al₂O₃ particles and the most of particles distribute on the domains (making up of arranged macromolecule) interface of PI. Under the high energy electron beam bombarding, the structures of Al₂O₃ particles are stable. The fractional dimensions of the film close to the theory value of DLA and the rotary radius agrees with the experiment results.Raising DC voltage by step, the breakdown characteristics of 100CR and 100HN films have been studied. The results show that the film breakdown belongs to stable heat type accompanying a wire hole with 200 μm in radius. The results show that breakdown holes for both films have obviously differences. The hole edges are coarse and uneven for 100CR and the damage zone is only around the hole. But for 100HN, the deformation zones are smooth and the damage zones are large forming many projection zones.The research results show that the inorganic nanoparticles change environment of PI matrix and play a role of improving thermal conductivity, increasing corona-resistance, decreasing heat damage and preventing electrode damage.