Polyimides Reinforced With The Sol-Gel Derived Organosilicon Nanoparticles: Synthesis And Structure/Property Relationships

摘要

Polyimide-based nanocomposites prepared by the in situ generation of cross-linked organosilicon nanoparticles (ON) through the sol-gel process were characterized by X-ray diffraction, dynamic mechanical analysis and dielectric spectropscopy. The ON turned out to possess a rather loose inner structure characterized by the mean-square electron density fluctuations and dynamic elasticity moduli comparable to those of the pristine, glassy PI. Both a looser molecular packing of PI chain fragments adjacent to the ON and a loose inner structure of the spatial aggregates of ON were believed to be responsible for a non-additive decrease of the experimental values of dielectric permittivity for the PN. The data obtained suggested a reasonably good potential of PI reinforced with the ON as low dielectric permittivity materials.