Molecular mobility in organic-inorganic composites based on polyimide with card substituents.

The molecular mobility was analyzed in organic-inorganic composites based on polyimide with card substituents using EPR spectroscopy with nitroxyl paramagnetic probe TEMPO. According to data obtained introduction of tetraethoxysilane into polyimide with card substituents in all cases is accompanied with decreasing of inhomogeneity of the polyimide component in composite. The reducing of correlation time value is observed with temperature growth due to polymer mobility rise as well as fast recovering of initial state of thermo cured polyimide after cooling. [ABSTRACT FROM AUTHOR]