Synthesis and characterization of novel sulfonated polyimides from 1,4-bis(4-aminophenoxy)-naphthyl-2,7-disulfonic acid

Tuning transport properties by manipulating the phase segregation of tetramethyldisiloxane segments in modified polyimide electrolytes

“…ODA-based sulfonated polyimide (SPI) was synthesized as described elsewhere [11,[14][15][16]. In a typical experiment, BDSAEt 3 HN (8 mmol), ODA (8 mmol) and m-cresol (50 ml) were add to a three-neck flask with stirring under nitrogen flow.…”

“…Various sulfonated aromatic polymers, such as: poly(aryl ether sulfone) [3][4][5][6], poly(ether ketone) [7,8], polyimide (PI) [9][10][11][12][13][14][15][16][17][18], Polybenzimidazole (PBI) [19][20][21][22][23], etc. have been proposed as alternative membrane materials.…”

“…The flexibility of the siloxane segments was expected to inhibit the formation of a dense, well packed polyimide structure. Sulfonated polyimides without siloxane segments were also prepared using ODA for comparison: such ODA based polyimides are reported to have good film-forming ability [11,[14][15][16][17].…”

Synthesis and characterization of sulfonated polyimides derived from 2,2′-bis(4-sulfophenyl)-4,4′-oxydianiline as polymer electrolyte membranes for fuel cell applications

“…Aromatic hydrocarbon polymer materials have been extensively investigated and revealed to have high potential as PEMs [2][3][4][5]. Sulfonated polyimides (SPIs) derived from 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA) are considered as one of the promising candidates because of their low fuel crossover, excellent film-forming ability and mechanical properties [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In the early stage, the SPIs based on 2,2 -benzidinedisulfonic acid (BDSA), a commercially available sulfonated diamine monomer, were developed and their properties including fuel cell performance were studied by several research groups [6,7,17,18].…”

“…However, their stability towards water at high humidity atmosphere and temperature was not enough to satisfy the practical requirements because of the hydrolysis of imide rings. Recently, SPIs based on several other sulfonated diamines have been reported to have much better water stabilities [8][9][10]15,16,22].…”