Abstract: In the present paper sulfonated poly (phenylene oxide)lithium (SPPOLi) was blended with ester plasticizers propylene carbonate, dioctyl phosphite, and butyl stearate, respectively.It was found that the dielectiric constants of plasticizers had a significant influence on the conductivity of blends: the plasticizer with high dielectric constant could increase the conductivity of SPPOLi effectively. It was also found that the dependence of the conductivity of blends on temperature was not consistent with the Arrhenius equation. The ionic migration numbers indicated that the blends were single-ion conductivity materials. X-ray diffraction was used to investigate the condensed state structure of the blends.

Key words: sulfonated poly(phenylene oxide) lithium, ester plasticizer, blend, conductivity