| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 105 === Three novel tetraamines were synthesized via several steps three different compound. Novel polybenzimidazoles P1~P3 were prepared
from OBA and monomer (5), (10) and (14), respectively. P3 could not be characterized because ofincompleted cyclization. The structures of P1 and P2 were characterized by 1H-NMRand FTIR. The inherent viscosity of P1 and P2, measured in methanesulfonic acid at35 ℃ and 0.2 g/dL, were 3.2 and 2.9 dL/g, respectively. P1 and P2 could be prepared as transparent, flexible, and tough membranes by solution casting. P1 and P2 show
outstanding thermal and oxidative stability. When P1 and P2 membranes were immersed in differentconcentrations of phosphoric acid (85, 80 and 75 %) at room temperature, P1 and P2 show good phosphoric acid uptake (PU, %), respectively. The tensile strength of P1 and P2 membranes
was 24.4 and 17.0 MPa when PU were achieve maxium, respectively. For single fuel cell test at 160 ℃, the peak power density of P1 and P2 are higher than thatof m-PBI at 291% PU (573 mW/cm2). It shows that P1 and P2 are promising proton exchange membranes for HT-PEMFC applications.
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