| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 기능성 고분자 |
| 제목 | Nafion/sulfonated poly(arylene ether ketone) composite membrane for direct methanol fuel cell |
| 초록 | Nafion is one of the most studied and employed perfluorinated electrolyte membranes for fuel cell. Although Nafion membranes show excellent properties in hydrogen fuel cell, they are not suitable for DMFC applications due to the high methanol permeability. To reduce the methanol crossover, Nafion membranes was modified by methanol barrier materials, sulfonated poly(arylene ether ketone). In this study, we prepare and characterize the cast membranes consisting of Nafion and sulfonated poly(arylene ether ketone). Morphology, proton conductivity and methanol permeability of the resulting composite membranes were investigated by SEM, EDAX, AC impedance spectroscopy and permeability measuring instrument. At the room temperature, the blend solutions of Nafion and sulfonated poly(arylene ether ketone) were immiscible. Two layers of sulfonated poly(arylene ether ketone) rich top layer and Nafion rich bottom layer were formed at the room temperature. Nafion was settled down because the specific gravity of Nafion was much higher than sulfonated poly(arylene ether ketone). The morphology and property of composite membrane can be regulated by varying the blend composition, the degree of sulfonation or other conditions. The cross-sections of composite membranes showed phase separated morphology. The morphology and the phase separation mechanism could be controlled by varying the blend ratio and the degree of sulfonation of poly(arylene ether sulfone). These complex morphologies can be applied for reducing methanol crossover. |
| 저자 | 최지수, 김일태, 김성철 |
| 소속 | 한국과학기술원 |
| 키워드 | Nafion; sulfonated poly(arylene ether ketone); membrane; fuel cell |
