Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7021570 | Journal of Membrane Science | 2015 | 8 Pages |
Abstract
Sulfonated polyimides containing benzimidazole (SPIBI) with varies sulfonation degree (DS) are synthesized by 1, 4, 5, 8-naphthalenetetracarboxylic dianhydride (NTDA), 5-amino-2-(4-aminophenyl) benzimidazole (APABI) and 4, 4â²-diaminodiphenyl ether-2, 2â²-disulfonic acid (ODADS). The cross-linked SPIBI membranes can be prepared with 3, 3â², 5, 5â²-tetramethyl-diphenyl diglycidyl ether (TMBP) as cross-linker during the following thermal treatment process. By adjusting the DS of SPIBI and the weight ratio of the crosslinker, a series of the cross-linked membranes are obtained. All the obtained membranes exhibit good cross-linking densities for the gel fractions higher than 75%. Compared to pure SPIBI membranes, the mechanical properties, oxidative and hydrolytic stabilities of the cross-linked membranes are improved significantly. For instance, the tensile strength of the cross-linked membranes is in the range of 53.6-108.4 MPa, the anti-free oxidative stability of SPIBI-80-15 (with a cross-linker content of 15 wt% and DS of 80%) is almost four times of the data of the uncross-linked SPIBI-80 which is tested by Fentonâ²s reagent (3% H2O2, 3 ppm Fe2+) at 80 °C. SPIBI-80-15 also exhibits much higher hydrolytic stability for more than 1440 h, while that of SPIBI-80 is 27 h in the same condition. The proton conductivity of the cross-linked membranes ranges from 10â3 to 10â2 S cmâ1.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Haiyan Pan, Shixiong Chen, Yuanyuan Zhang, Ming Jin, Zhihong Chang, Hongting Pu,