Synthesis and Investigation of Polyimide-based Proton-exchange membranes Containing Polysiloxane and Crown Ether Moiety

摘要

In present work, a number of polyimides contained polysiloxane and crown-ether moiety in the main chain were synthesized. Solubility in organic solvents and film-forming ability were investigated. Prepared polymers are insoluble in low boiling solvents and highly soluble in m-cresol, NMP and DMSO. Strong films were prepared with NTDA monomer, with the exception of the PI of the composition BNTDA-BDSA. Thermal properties of films were studied in comparison with corresponding powders. All prepared films demonstrated a sufficiently high thermal stability and suitable for design of low-temperature fuel cells (up to 100 °C) and can be used for medium temperature fuel cells (140-200 °C). The mechanical properties of the prepared strong films were also examined.