2019 (2) 5

Polymeric organic-inorganic proton-exchange membranes based on anionic oligomeric ionic liquid of hyperbranched structure

A.V. Stryutsky1, O.O. Sobko1, M.A. Gumenna1, N.S. Klimenko1, A.V. Kravchenko2, V.V. Kravchenko2, A.V. Shevchyuk2, V.V. Shevchenko1

1Institute of Macromolecular Chemistry of the National academy of sciences of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

2L.M. Litvinenko Institute of Physical-organic Chemistry and Coal Chemistry NAS of Ukraine

50, Kharkivske shose, Kyiv, 02160, Ukraine

Polym. J., 2019, 41, no. 2: 123-129

Section: Synthesis of polymers.

Language: Russian.

Abstract:

A method for sol-gel synthesis of organic-inorganic polymeric proton-exchange membranes (PEM) with anhydrous mechanism of proton conductivity based on the protic anionic hyperbranched oligomeric ionic liquid (HBP-OIL) as a dopant was developed. These membranes contain oligoethyleneoxide component and HBP-OIL as anhydrous proton-conducting medium and the latter plays a role of proton-donating component. The structure of the synthesized membranes was confirmed by FTIR spectroscopy. Thermophysical characteristics were determined by DSC and TGA. According to DSC study the proposed membranes are characterized by an amorphous structure and their Tg values range from -12° C to 30° C. It was shown that the values of Tg and the nature of structuring of the PEMs is determined by the content of the dopant in their composition. The PEM synthesized are thermally stable up to 250–280 °С. The initial dopant and the PEM with the highest content of the dopant are characterized by a maximum thermal stability. The protic conductivity of the developed membranes according to the results of dielectric relaxation spectroscopy measurements is 10–4–10–3 S/cm at temperatures of 100–120 °C under anhydrous conditions. The highest level of conductivity was reached for the PEM with a maximum content of the dopant. The conductivity of this membrane is 4,67·10-3 S/cm and 8,11·10-3 S/cm at temperatures of 100 °C and 120 °C, respectively under anhydrous conditions.

Keywords: oligomeric ionic liquid, hyperbranched structure, organic-inorganic polymeric proton-exchange membrane, sol-gel method, ionic conductivity.

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