| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polymer electrolyte membrane having water resistance, methanol resistance, high proton conductivity and low methanol permeability. <P>SOLUTION: This electrolyte membrane is formed of a sulfonated proton-conducting polymer. In the electrolyte membrane, water-absorbing membrane sulfonate group volume density of the proton-conducting polymer, defined by mathematical Equation (1), is 1.45-6.0 mmol/cm<SP>3</SP>. The mathematical Equation (1): (water-absorbing membrane sulfonate group volume density)=(absolute dry membrane sulfonate group volume density)/ä1+(water absorption coefficient)/100×(absolute dry membrane density)}. In the mathematical Equation (1), absolute dry membrane sulfonate group weight density, the absolute dry membrane sulfonate group volume density and the water absorption coefficient are defined by mathematical Equations (2)-(4), respectively. The mathematical Equation (2): (absolute dry membrane sulfonate group weight density)=(number of moles of sulfonate group)/(absolute dry membrane weight). The mathematical Equation (3): (absolute dry membrane sulfonate group volume density)=(absolute dry membrane sulfonate group weight density)×(absolute dry membrane density). The mathematical Equation (4): (water absorption coefficient)=(water weight in membrane)/(absolute dry membrane weight)×100. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
