Abstract
SPPESK/PVDF blend membranes with different contents of PVDF were prepared by casting process. Scanning electron microscopy (SEM), liquid uptake, swelling degree, proton conductivity, methanol permeability and longevity of blend membranes were investigated. SEM indicates that phase separation exists in blend membranes. Liquid uptake, swelling degree, proton conductivity and methanol permeability collectively decrease as the content of PVDF increases. The addition of PVDF in blend membranes suppresses swelling degree of SPPESK's hydrophilic part, improves mechanical stability. Though the proton conductivity of blend membranes reduces to a certain extent, their methanol resistant performance remarkably enhances. Oxidation stability test indicates that the longevity of blend membranes is extended due to the addition of PVDF. Based on the preliminary results, it can be concluded that the polymer blends of SPEEK/PVDF can be used as a candidate membrane materials for direct methanol fuel cells (DMFC) applications.
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