| 초록 |
It was well known the sulfonated poly(arylene ether sulfone)s (SPAESs) membranes have several advantages such as low cost, high mechanical strength and proton conductivity. But yet, this material exhibits several shortcomings such as reduced conductivity at low humidity, high methanol permeability and water uptake. In this study, block copolymers based on partially SPAESs were prepared by a direct polymerization and the membranes were fabricated from each copolymer by a solution casting technique. The degree of sulfonation of membranes was fixed as 50%. Resulting copolymers were characterized by various analytic methods, and membrane properties were examined thoroughly for fuel cell applications. It was found that the change of morphology of the membranes could afford to affect to both proton conductivity and fuel cell performance; they were improved with increasing of the lengths of hydrophilic-hydrophobic segments. |
