ORGANO-INORGANIC SULFOGROUP-CONTAINING MEMBRANES FOR FUEL CELLS
Journal Title: Праці Наукового товариства ім. Шевченка - Year 2018, Vol 53, Issue
Abstract
The polymeric and organic-inorganic sulfogroup-containing membranes of various composition based on acrylic monomers (acrylonitrile, acrylamide and 3-sulfopropyl acrylate potassium salt) and sol-gel systems of tetraethoxysilane (TEOS – H2O – C2H5OH) were successfully synthesized by in situ photoinitiated copolymerization in the presence of photoinitiator and cross-linker. The determined content of the gel fraction in the synthesized films was > 98 % indicating that the UV-initiated polymerization of acrylates under the chosen conditions was very high. The kinetics of the process of photoinitiated polymerization of a mixture of acrylates in the absence and in the presence of a sol-gel system was studied by means of laser interferometry. Kinetic parameters of the process (time of maximal rate achievement, maximal rate of the process, conversion at maximal rate) were calculated. Free surface energy and its components (dispersive and hydrogen) for prepared polymer and organic-inorganic nanocomposite membranes at varying of acrylic monomers/sol-gel system ratio were estimated by contact angle measurements. The composition of the polymer matrix and the content of the inorganic component have a significant effect on the kinetics of the polymerization process and on the structure of the resulting materials, which is confirmed by the change in their hydrophobic-hydrophilic balance. The presence of sulfogroups in the obtained nanocomposite materials provides their proton conductivity. Specific proton conductivity of the synthesized materials, measured by impedance spectroscopy method, is sufficiently high – 10–3 – 10–2 Sm/cm and comparable with that for Nafion. The conducted researches can be used for the development of efficient proton conductive membranes for application in fuel cells.
Authors and Affiliations
Khrystyna RYMSHA, Mariia ZHYHAILO, Oksana DEMCHYNA, Iryna YEVCHUK
Keywords
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