Abstract
A sulfonated diamine monomer, 4,4'-bis (4-aminophenoxy) diphenyl sulfone-3,3'-disulfon-ic acid (BAPPSDS), was synthesized via two-step reactions. A series of sulfonated (co) polyimides with controlled ion exchange capacities (IECs) were prepared from 1,4,5,8-naphthalenetetracarboxylic dian-hydride (NTDA), BAPPSDS, and common nonsulfonated diamines in m-cresol in the presence of triethyl-amine and benzoic acid at 180°C. The resulting sulfonated copolyimides show good solubility and high thermal stability. At high relative humidities the sulfonated copolyimide membranes exhibit high proton conductivities which are comparable to that of Nafion 117. The water stability is strongly dependent on both the IEC level and the configuration of the sulfonated diamine. Polyimide membranes with high proton conductivity as well as good water stability were developed.
| Original language | English |
|---|---|
| Pages (from-to) | 297-301 |
| Number of pages | 5 |
| Journal | Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University |
| Volume | 41 |
| Issue number | 2 |
| Publication status | Published - Feb 2007 |
| Externally published | Yes |
Keywords
- 4,4'-bis (4-aminophenoxy) diphenyl sulfone-3,3'-disulfonic acid
- Proton conductivity
- Sulfonated polyimide
- Water stability