Search academic texts

Information × Registration Number 0207U000468, 0103U006268 , R & D reports Title Synthesis and physical chemistr of generation of organo-inorganic nanophase in semi-rigid chain polymer and property characterization of nanocomposites derived thereof popup.stage_title Head Privalko V.P., Registration Date 24-01-2007 Organization Institute of Macromolecular Chemistry NASU popup.description2 Polyimides (PI) reinforced with the cross-linked organosilicon nanophase (ON) formed by the sol-gel procedure were characterized by a variety of experimental techniques. The ON proved to possess a rather loose inner structure characterized by the enhanced water diffusivities and by the mean-square electron density fluctuations and dynamic elasticity moduli comparable to those of the pristine, glassy PI. Static mechanical and dynamic thermomechanical properties of nanocomposites in the glassy state remained nearly the same as those of the pristine PI, while a significant reinforcement effect was observed in the rubbery state above the main relaxation at T? 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 nanocomposites. The data obtained suggested a reasonably good potential of PI reinforced with the ON as low dielectric permittivity materials5635 Product Description popup.authors popup.nrat_date 2020-04-02 Close