| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 가을 (10/10 ~ 10/11, 부경대학교) |
| 권호 | 28권 2호, p.337 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Stability and conductivity studies of sulfonated polyimides with five-membered ring structure |
| 초록 | Many important properties required for fuel cell application including hydrolytic stability, depend on various factors like flexibility of the polymer backbone, ring structure and phase separation. The solvent system used in the synthesis and curing process is known to affect the polyimide morphology and physical properties. This paper primarily focused on studying the effect of the solvent used on the hydrolytic stability together with the attempts to evaluate the effect of chemical backbone and morphology. Difference in the hydrolytic stability is observed with varying the solvent system of the five-membered sulfonated polyimide synthesis. Polyimides prepared using m-cresol as solvent exhibited higher hydrolytic stability than (m-cresol / 1-methyl-2-pyrrolidinone, NMP) solvent mixture. The proton conductivity, ion exchange capacity (IEC) and water uptake measurements revealed the dependence on the molecular weight of the repeating unit and exhibited a minimum barrier of sulfonyl substitution whereas further increase in functionalization improves the properties only to a smaller magnitude but below which the conductivity is very low. The proton conductivity of the sulfonated polyimides was found to be not only dependent on the IEC value but also on various morphological factors. Acknowledgment : This work was supported by the Ministry of Science and Technology of Korea through the National Research Laboratory Program. |
| 저자 | 이춘근, 박형석, 권진욱, S. Sundar, 설용건, 한학수 |
| 소속 | 연세대 |
| 키워드 | polyimide; fuel cell; hydrolytic stability; conductivity |
