New polymer electrolyte membrane for medium-temperature fuel cell applications based on cross-linked polyimide Matrimid and hydrophobic protic ionic liquid |
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| Authors: | S Rogalsky J-F Bardeau S Makhno O Tarasyuk N Babkina T Cherniavska M Filonenko K Fatyeyeva |
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| Institution: | 1. V. P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of National Academy of Sciences of Ukraine, Laboratory of Modification of Polymers, 50, Kharkivske Schose, 02160, Kyiv, Ukraine;2. Institut des Molécules et Matériaux Du Mans, UMR CNRS 6283, Université Du Maine, Université Bretagne – Loire, Avenue Olivier Messiaen, 72085, Le Mans Cedex 9, France;3. Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, Laboratory of Electrophysics of Nanomaterials, 17, General Naumov Str., 03680, Kyiv, Ukraine;4. Institute of Macromolecular Chemistry of National Academy of Sciences of Ukraine, Department of Physics and Chemistry of Polymers, 48, Kharkivske Schose, 02160, Kyiv, Ukraine;5. National Pedagogical Dragomanov University, Faculty of Physics and Mathematics, 9, Pyrogova St., 01601, Kyiv, Ukraine;6. Normandie Univ, UNIROUEN, INSA Rouen, CNRS, Polymerès Biopolymères Surfaces (PBS), 76000, Rouen, France |
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| Abstract: | New hydrophobic protic ionic liquid, 2-butylaminoimidazolinium bis(trifluoromethylsulfonyl)imide (BAIM-TFSI), has been synthesized. The ionic liquid showed good thermal stability to at least 350 °C. The conductivity of BAIM-TFSI determined by electrochemical impedance method was found to be 5.6 × 10?2 S/cm at 140 °C. Homogeneous composite films based on commercial polyimide (PI) Matrimid and BAIM-TFSI containing 30–60 wt% of ionic liquid were prepared by casting from methylene chloride solutions. Thermogravimetric analysis data indicated an excellent thermal stability of PI/BAIM-TFSI composites and thermal degradation points in the temperature range 377 °C–397 °C. The addition of ionic liquid up to 50 wt% in PI films does not lead to any significant deterioration of the tensile strength of the polymer. The dynamic mechanical analysis results indicated both an increase of storage modulus E′ of PI/BAIM-TFSI composites at room temperature and a significant E′ decrease with temperature compared with the neat polymer. The cross-linking of the PI with polyetheramine Jeffamine D-400 allowed to prepare PI/Jeffamine/BAIM-TFSI (50%) membrane with E′ value of 300 MPa at 130 °C. The ionic conductivity of this cross-linked composite membrane reached the level of 10?2 S/cm at 130 °C, suggesting, therefore, its potential use in medium-temperature fuel cells operating in water-free conditions. |
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| Keywords: | Proton-conducting membrane Composite film Storage modulus Ionic conductivity Fuel cells |
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