| 초록 |
Proton exchange membranes (PEMs) play an importance role in proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs), serving as both electrolyte and separator. An ideal membrane has to meet several demanding requirements such as chemical and electrochemical stability, mechanical strength and integrity, and high proton conductivity. Especially, Nafion® representing perfluorosulfonic polymers has high performance as PEMs such as high conductivity, good mechanical and chemical stability, whereas the applications are limited by high cost and high methanol permeability. To solve these problems, many polymers have been designed and studied for PEMs. On the other, polynorbornene copolymers with high glass transition temperature, low dielectric constant, and low moisture absorption are attractive as optical device materials, which are produced via a novel transition metal catalyzed polymerization. In this work, a new type of PEMs, partially sulfonated polynorbornene copolymer is prepared for DMFC. The studies on PEMs for DMFC have been focused on fabrication of membranes with not only high proton conductivity and low methanol permeability but also high mechanical and thermal stability. |
