Poly(ethylene or;ide) (PEO) oligomers having a variety of sulfonamide (SA) salts on the chain end [PEOm-SO2NM-R; R = -C6H5 (I-m), -CH2CF3 (IIm), and -C2H4OCH3 (IIIm), M = Li or K, m = molecular weight (M-w) of PEO part] were synthesized as new types of ion conductive polymers. These hybrids are low viscous Liquids over a wide temperature range and amorphous without forming a crystalline phase when the molecular weight of the PEO part is from 350 to 750. These hybrids show a higher bulk ionic conductivity than other PEG/salt hybrids having sulfonate or benzenesulfonate groups. Among them, III550 for the K salt showed the highest bulk ionic conductivity (4.0 x 10(-5) S cm(-1)) at room temperature, although the 2-methoxyethyl end group is electron-donating. The Vogel-Tamman-Fulcher (VTF) equation predicts that ion conduction in these hybrids is governed by the mobility of the terminal groups. Furthermore, the ionic conductivity was improved by the addition of KClO4.