| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Synthesis and Characterization of Sulfonated Polyimide- Hetero polyacid composite membranes for high temperature fuel cells |
| 초록 | HPA has strong attraction with sulfonic acid groups in the sulfonated polymers and hence it is strongly bound to the polymer. Despite its inherent solubility in water, HPA was retained in polymer for sufficiently longer time in the composite membrane and exhibit improved property. Moreover these composite membranes with HPA exhibit higher thermal and hydrolytic stability. Hence these composite membrane are expected to improve the properties of polyimides in a better way and a synergic effect of polyimide and the HPA is envisioned. Polyimides with 2-bis[4-(4-aminophenoxy)phenyl]- hexafluoropropane in the backbone was synthesized and a series of composite membrane with various amount of heteropolyacid was synthesized. The effect of HPA content on the various proerpties was studied in detail. The typical vibrations of HPA molecules were observed around the W–O stretching region at 810 cm-1, 895 cm-1 and 980 cm-1 which are the absorptions bands of W-O-W, W-O-W and W=O respectively. These bands suggest that the HPA attains the keggin structure when incorporated into polymer matrix. The thermal stabilities of the sulfonated polyimide and composite membranes with HPA were determined by thermogravimetric analysis (TGA). Theoretical IEC of the polyimides were calculated and compared with experimental value. Both the experimental and theoretical IEC values decreased as NBBH0＞ NBBH10 ＞ NBBH20＞ NBBH30. It was observed that the water uptake decreased with increase in HPA content as as NBBH0＞ NBBH10 ＞ NBBH20＞ NBBH30 which is in accordance with the IEC trend. The conductivity of all the synthesized films and Nafion®117 increased with increase in temperature which was due to the increased mobility of water and structural reorientation as well as increased molecular mobility. Acknowledgement This work was supported by the Ministry of Science and Technology of Korea through the National Research Laboratory Program |
| 저자 | 김민주, 조태수, 설용건, 한학수 |
| 소속 | 연세대 |
| 키워드 | polyimide; electrolyte membrane; polyhetero acid; conductivity |
