| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.432 |
| 발표분야 | 기능성 고분자 |
| 제목 | High Temperature Membrane base on Poly(dimethyl siloxane) |
| 초록 | Poly(dimethyl siloxane) (PDMS) has been widely used in various applications due to thermal, chemical stability and low price. PDMS is intrinsically hydrophobic character but it can be modified to be amphiphilic by substituting end groups with hydrophilic phosphorous groups. It would drive phase separation structure and result in forming the proton conducting channels. In this work, we synthesized functionalized PDMS by phosphorous groups and studied its electro-chemical properties and structure. Firstly, 3-ethoxy terminated PDMS was obtained by hydrosilylation of vinyl terminated PDMS and triethoxysilane in the presence of PtO2 as a catalyst. It was purified through the column filled with Celite 545 and activated carbon to eliminate the unreacted components and catalyst. After the solvent evaporated, they were reacted with 3-aminopropyl triethoxysilane (3-APTES) by sol-gel method for 12 hrs at 100 ℃. Phosphorus oxychloride was added to this solution to bestow ion conductivity on the PDMS. Finally, the flexible membranes were obtained by casting viscous solution at 80 ℃. The phase separation between hydrophobic region of PDMS and hydrophilic of phosphorous groups would form the proton conducting channels in the membrane. FT-IR and H-NMR spectroscopies were used to analyze the membrane. Proton conductivity were measured by Impedance analyzer (IM6, Zahner) under control of temperature and humidity. It could be used for medium temperature proton conducting membrane at low humid conditions due to conducting mechanism of phosphorous groups in these conditions. |
| 저자 | 김지수, 김영택, 이희우 |
| 소속 | 서강대 |
| 키워드 | fuel cell; pdms |
