Abstract
Cross-linked sulfonated poly(imide-siloxane) (cSPI-SX) is obtained by radical polymerization onto the silylmethyl group of poly(dimethylsiloxane) (PDMS). The chemical structure of the cSPI-SX thus formed is characterized by FT-IR and 13C NMR. The properties required for a proton exchange membrane, such as ion exchange capacity, water uptake, dimensional change, hydrolytic stability, and proton conductivity, are measured and investigated in detail. A transmission electron microscopic (TEM) image shows the presence of large, well-connected hydrophilic domains that are responsible for the high proton conductivity of the cSPI-SX membrane. The unique phase separated morphology of the cSPI-SX membrane supports the outstanding hydrolytic stability. A PEFC assembled with the cSPI-SX membrane has showed high power output at a humidifier gas temperature of 30 °C, a cell operating temperature of 70 °C and a gas pressure of 0.3 MPa.
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