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Your search keyword '"Dragan, K. S."' showing total 6 results
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6 results on '"Dragan, K. S."'

3. Synthesis and thermomechanical characterization of polyimides reinforced with the sol-gel derived nanoparticles.

Author

Shantalii, T. A., Karpova, I. L., Dragan, K. S., Privalko, E. G., and Privalko, V. P.

Subjects
POLYIMIDES, NANOPARTICLES, THERMAL analysis, NANOCOMPOSITE materials, THERMOMECHANICS of magnetic fluids, SILICON compounds, SILICON
Abstract

Polyimide-based nanocomposites prepared by the in situ generation of inorganic nanoparticles (silica) through the sol-gel process were characterized by kinetics of water uptake, thermogravimetry and dynamic mechanical analysis. Silica particles turned out to possess a rather loose inner structure characterized by enhanced water diffusivities and by dynamic elasticity moduli comparable to that of the pristine, glassy PI. Thermal stability and 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 for the rubbery PI matrix. [ABSTRACT FROM AUTHOR]

Published
2003
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4. Peculiarity of the formation structure of hybrid systems based on polyimide and tetraethoxysilane.

Author

Shantalii, T. A., Gomza, Y. P., Nesin, S. D., Dragan, K. S., and Klepko, V. V.

Subjects
*POLYIMIDES, *SILANE compounds, *SILICA analysis, *SMALL-angle X-ray scattering, *INORGANIC compounds
Abstract

Structure research of hybrid organic-neorganic composites based on polyimide and tetraethoxysilane by x-ray scattering has shown that at introduction of the minimum quantity of an inorganic component contrast of the spatially-ordered structure of polyimide matrix increases. At the further increase in the content of an inorganic component the violation of the smallangle periodicity and formation of anizodiametric inclusions enriched with SiO2 is observed. [ABSTRACT FROM AUTHOR]

Published
2012

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

Author

Kozak, N. V., Shantalii, T. A., Lobko, Eu. V., Dragan, K. S., and Klepko, V. V.

Subjects
*POLYMERIC composites, *POLYIMIDES, *NITROXYL, *PARAMAGNETISM, *ELECTRON paramagnetic resonance spectroscopy, *COOLING, *THERMAL properties of polymers
Abstract

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]

Published
2011

6. Influence carbon nanotubes on the structure peculiarity of polyimide.

Author

Gomza, Y. P., Shantalii, T. A., Nesin, V. D., Dragan, K. S., and Klepko, V. V.

Subjects
*CARBON nanotubes, *MOLECULAR structure, *POLYIMIDES, *SYNTHESIS of Nanocomposite materials, *POLYMERIZATION, *DIAMINODIPHENYLMETHANE, *ANHYDRIDES
Abstract

Polyimide nanocomposites were synthesized by in situ polymerization using 4,4'- diaminodiphenylmethane, pyromellitic dianhydride, carbon nanotubes. The structure of polyimide nanocomposites were studied using SAXS method. It was established reversibility of contrast structure at contents of CNT above percolation threshold. [ABSTRACT FROM AUTHOR]

Published
2011

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