СТРУКТУРА ТА ВЛАСТИВОСТІ ПОЛПМЩНИХ ОРГАНО-НЕОРГАНІЧНИХ НАНОКОМПОЗИТІВ НА ОСНОВІ ТЕТРАЕТОКСИСИЛАНУ ТА МЕТИЛТРИЕТОКСИСИЛАНУ

Heat-resistant polymer nanocomposites based on polyimide matrix and mixture of ethoxysilanes have been synthesized and investigated. Using the sol-gel method, samples were obtained based on pyromellitic acid dianhydride and 4,4'-diaminodiphenyl ether and mixtures of tetraethoxysilane and methyltriethoxysilane in the ratio (1: 1, 1: 2) in the amount (5, 20, 50% by weight of the original PACK).  e in􀄘 uence of the ratio and content of ethoxysilanes on the structure and properties of nanocomposites was studied by the methods of X-ray structural analysis, dielectric spectroscopy and thermogravimetric analysis.  e established structural dependences for these composites allow us to conclude that there is no signi􀄕 cant eff ect of the ratio and amount of ethoxysilane introduced into the system to form the inorganic component on the structure.  e obtained materials are characterized by high thermal stability, low dielectric constant.  e greatest decrease in dielectric constant compared to the original polyimide is observed for samples with diff erent ethoxysilane ratio at 20% content.  e resulting nanocomposites are characterized by high thermal stability and can be used in high temperature conditions. [ABSTRACT FROM AUTHOR]