Abstract: The copolyethers of methoxy polyethylene glycol methacrylate (MEO₁₆)with acrylamide derivatives, such as methylacrylamide (MA), N,N dimethylacrylamide (DMA), and N, N-diethylacrylamide (DEA), were prepared by plasma-initiated polymerization. The order of conversion of the acrylamides is as follows: MA>DMA>DEA. The crystallinities(X_c) and the glass transition temperatures (T_g) of the copolyethers became lower after the addition of the acrylamides.The relations between the compsition of the P(MEO₁₆-DMA) and the X_c, the T_g were discussed, The ionic conductivity of the P(MEO₁₆-DMA)-LiClO₄is 5.5×10^-5S·cm^-1 when the content of DMA is about 50mol% and the EO/Li is about 32 at 25℃, but that of the PMEO₁₆-LiClO₄ is 1.89×10^-5S·cm^-1 at the same conditions.

Key words: plasma-initiated polymerization, copolyether, polymeric fast ionic conductor, methoxy polyethylene glycol methacrylate, methylacrylamide, N, N-dirnethylamide, N-diethylacrylamide