Synthesis and Characterization of Polyimides Bearing Benzimidazole Pendant Groups for Proton Exchange Membrane

• Main Authors: Chia-Yun Wang, 王鉫允
• Other Authors: Yaw-Terng Chern
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/fdv5p5

碩士 === 國立臺灣科技大學 === 化學工程系 === 107 === A novel diamine, 2,2-bis(4-(2-(5-aminobenzimidazoly))phenyl)prop- ane(Bis/IM/NH2), containing a benzimidazole pendant groups and flexible ether linkage was synthesized successfully. The polyimides were synthesized by condensation polymerization from 2,2-bis(4-(2-(5-amino- benzimidazoly))phenyl)propane(Bis/IM/NH2) and 1,4,5,8-Naphthalene- tetracarboxylic dianhydride(NTDA). They had inherent viscosities of 0.75~1.59 dL/g. All polyimides formed tough and transparent films. The PIs exhibited high thermal stability with 10 % decomposition temperature more than 450 oC in nitrogen. The proton conductivity of phosphoric acid doped PI was dependent on doping PA level and temperature. These PIs with relatively low acid doping level have higher proton conductivity than m-BPI. For example, Bis7PF2.7DMB0.3 had the highest proton conductivity at 200 oC (204 % H3PO4 uptake, 84.2 mS/cm) among those polyimides.