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| H3PO4 then becomes the conductive medium in the membrane. PBI offers several other desirable properties as well, such as high thermo-oxidative stability and a rigid structure at high operating temperatures (Tg ) 425 °C). However, PBI also has several disadvantages.PBI is made from 3,3′,4,4′-tetraaminobiphenyl, which has poor oxidative stability. In addition, PBI cannot be melt processed and has limited solubility in common organic solvents.The synthesis of PBI is designed to limit the molecular weight in order to increase solubility, which has an adverse effect on the mechanical properties. Wainright and co-workers have reported heating a 10% solution in DMAc at 94 °C leaves 69% of the polymer undissolved. However, the lower molecular weight material must be extracted to produce a polymer film with sufficient mechanical properties for fuel cell operation. |
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