| 초록 |
Recently, various types of hydrophilic-hydrophobic multiblock copolymers have been synthesized for fuel cell applications such as Proton Exchange Membrane Fuel Cell (PEMFC) and Direct Methanol Fuel Cell (DMFC). In this study, a series of novel multiblock copolymers based on partially sulfonated poly(arylene ether sulfone)s (SPAESs) containing fluorenyl group were prepared by nucleophlic polycondensation. The ion exchange capacity (IEC) of copolymers was controlled by changing the feed ratio of the hydrophilic/hydrophobic oligomers (IEC=1.5~2.0). The membranes were prepared by solution casting technique, and the properties of resulting cast membranes were characterized by water uptake, dimensional stability, proton conductivity, IEC, and fuel cell performance. These membranes exhibited good dimensional stability and high proton conductivity (＞1.0 S/cm at 25℃, 100% RH). These membranes are of interest as new polymeric electrolyte proton exchange membranes. |
