| 초록 |
The most significant proron exchange membrane(PEM) development since the introduction of Nafion by Dupont in 1968 has been a perflourosulfonic acid membrane. However, perfluorinated membrane are so expensive due to the toxic and complicated production process and have high MeOH crossover. In this study ,the system of styrene sulfonic acid and blending was used for solving these problems. Polystyrene-b-poly(styrene sulfonic acid) sodium salt (PS-b-PSSNa) was synthesized via stable radical polymerization (SFRP) using TEMPO and the block copolymers were blended with poly(2,6-dimethyl -1,4-phenylene oxide) (MPPO) and then prepared fuel cell membrane. Block length ratio and total MW of PS-b-PSSA were varid differently and blend ratio of MPPO/PS-b-PSSA was also controlled. Influence of molecular structure of PS-b-PSSA and blend ratio on ion conductivity, morphology, and MeOH permeability of cast membranes were studied. Other characters for fuel cell membrane such as phase separation behavior and conductivity etc. will be discussed. |
