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Sol-gel synthesis and properties of organic-inorganic nanocomposites based on tetraethoxysilane

Work number - M 10 FILED

Department of PhysicalChemistryofFossil FuelsInstituteofPhysico-OrganicChemistryandCoalChemistrynamedafterL. M. Lytvynenko of NAS of Ukraine


Demchyna O.I.

Workis devoted to the study of the regularities of synthesis and characterization of organic-inorganic nanocomposite materials on the base of TEOS and GPS. Kinetic studies of hydrolysis of TEOS in acidic medium allowed to define the influence of initial system composition, temperature, catalyst concentrationon the process rate. The kinetic parameters of the process have been determined, which have been confirmed by quantum-chemical calculations.Process of structure formation in sol-gel systems under various conditions was studied on dynamics of sol-gel system viscosity and gradient dependence of viscosity. Time of gelation (percolation point), character of the changes of friction and elastic components of viscosity of sol-gel systems at gelation have been determined.

Investigations of  kinetics of photoinitiated polymerizationof acrylic monomers revealed a significant effect of the presence of sol-gel system in polymerizating mixture and time of previous system structuring on kinetic parameters of the process.

Synthesized organic-inorganic nanocomposites containing sulphogroups have proton conductivity 10-5-10-4 S / cm at room temperature, high thermal stability and significant water absorption, which allows to consider these materials as promising for the use as proton-conductive membranes in fuel cells.

Number of publications:50, including 1 patent of Ukraine for utility model number u201310612, 11articles in professional periodicals, separate materials of scientific activity tested in works of 38 conferences of international and regional significance.