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Registration Number

0221U101653, 0118U003622 , R & D reports

Title

Development of physico-chemical bases of synthesis and modification of nanocomposite membranes with ion-exchange, catalytic and proton-conductivity properties

Head

Yevchuk Iryna Yu., Кандидат хімічних наук

Registration Date

23-01-2021

Organization

Department of Physical and Chemistry of Combustible Fossils LM Litvinenko of the National Academy of Sciences of Ukraine

Description

The influence of the sulfonomonomer nature on the properties of proton conductive polyacrylate and polyacrylate/silica membranes was studied. Their structure and morphology were studied by IR and SEM. The water absorption and thermal properties of the membranes were studied. The synthesized proton conductive polyacrylate and polyacrylate/silica membranes, which include aromatic sulfo-containing monomer sodium 4-vinylbenzenesulfonate (NaSS), showed satisfactory values of proton conductivity – (1.17-2.85) 10-3 Sm/cm, water absorption, relatively high oxidative stability and thermal stability, so they can be used in fuel cells. X-ray structural and thermogravimetric analyzes of synthesized multilayer nanostructured composites with calytic layers CoFe2O4/SiO2/CoMnO2 and CoFe2O4/SiO2/CuO were performed. The synthesized catalysts adsorption capacity was investigated by monitoring adsorption of methylene blue dye. The main kinetic parameters of the process were calculated. The MB adsorption efficiency decreased with increasing its initial concentration, whereas an amount of adsorption increased. The optimal time of adsorption centers saturation with dye molecules was 50-60 min. The MB adsorption isotherms on the catalyst surface were described by the proposed pseudo-first order equation. The limiting MB adsorption and the adsorption constant were determined. The conformational volume of the internodal polymer chain was expressed using the statistics of random self-avoiding walk. It was found that the free energy of the conformation of the internodal chain of networked polymers and the work of its deformation are significantly larger than the corresponding values for the Flory coil - by a factor of 2^(2d/(d+2)) , 2.3 for d=3. The internodal chain conformation pressure is times higher than the Flory coil conformation pressure, ≈5.3 times larger for d=3. The internodal polymer chain elastic properties are the same times greater than the analogous values of the Flory coil.

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YEVCHUK Iryna Yu.
Demchyna Oksana I.
Zhyhaylo Mariya M
ZHURAVETSKA Iryna M
MAKIDO Olena Yu.
Medvedevskikh Yuriy G
Musiy Rostyslav Yo
Khovanets Halyna I.