Highly Sulfonated Diamine Synthesized Polyimides and Protic Ionic Liquid Composite Membranes Improve PEM Conductivity

作者：Chen, Bor Kuan^*; Wu, Tzi Yi; Wong, Jhong Ming; Chang, Yu Ming; Lee, Hsu Feng; Huang, Wen Yao; Chen, Antonia F

来源：Polymers, 2015, 7(6): 1046-1065.

DOI：10.3390/polym7061046

• proton exchange membrane
• sulfonated diamine
• sulfonated polyimide
• ionic liquid
• conductivity

A novel sulfonated diamine was synthesized from 1,4-bis(4-aminophenoxy) benzene [pBAB]. Sulfonated polyimides (SPIs) were synthesized from sulfonated pBAB, 1,4-bis(4-aminophenoxy-2-sulfonic acid) benzenesulfonic acid [pBABTS], various diamines and aromatic dianhydrides. Composite proton exchange membranes (PEMs) made of novel SPIs and a protic ionic liquid (PIL) 1-vinyl-3-H-imidazolium trifluoromethanesulfonate [VIm][OTf] showed substantially increased conductivity. We prepared an SPI/PIL composite PEM using pBABTS, 4,4-(9-fluorenylidene)dianiline (9FDA) as diamine, 3,3,4,4-diphenylsulfone tetracarboxylic dianhydride (DSDA) as dianhydride and 40 wt % [VIm][OTf] with a high conductivity of 16 mS/cm at 120 degrees C and anhydrous condition. pBABTS offered better conductivity, since the chemical structure had more sulfonated groups that provide increased conductivity. The new composite membrane could be a promising anhydrous or low-humidity PEM for intermediate or high-temperature fuel cells.

• 出版日期2015-6
• 单位中山大学