| 초록 |
Poly[2,2’-(m-phenylene)-5,5’-bibenzimidazole] (PBI) composite membranes were prepared using modified graphene oxide (ImGO) containing benzimidazole groups as a filler material for high-temperature proton exchange membrane. SEM images of the composite membranes indicated that compatibility of ImGO with PBI matrix is better than that of GO. As a result, composite membrane having ImGO exhibited improved physicochemical properties and higher proton conductivity than pristine PBI and PBI composite membrane having GO. For example, composite membrane having 0.5 wt% of ImGO showed enhanced tensile strength (219.2 Mpa) with minimized sacrifice of elongation at break value (28.8%) compared with the pristine PBI membrane (181.0 MPa, 34.8%) and composite membrane having 0.5 wt% of GO (216.3 MPa, 16.0%). The proton conductivity of this PBI/ImGO composite membrane, at 150 ℃ under anhydrous condition, was 77.52 mS cm-1 which is 46.8% larger than that of pristine PBI membrane. |
