| 초록 |
New ionic polymers containing dicationic pyrrolidinium cations are synthesized and characterized. Methacrylate monomers of a C4-bridged bis-pyrrolidinium pendant with different linear alkyl chain length are prepared as a polymerizable ionic liquid monomer, which can show soft crystalline phases. Free-surfactant emulsion polymerizations with a water soluble initiator K2S2O8 are used to prepare the ionic polymers. Polymerization conditions are 1) monomer and initiator ratio 3:1, 2) chloroform and DI water ratio 1:20, and 3) reaction temperature 90 ℃. Especially, ionic polymer with n-nonyl chain shows multiple transition peaks at 33 ℃ and 99 ℃ on a DSC heating scan. Also, the ionic polymers show crystalline morphologies on POM images. The swollen ionic polymers with methyl alkyl group by LiPF6/EC/DEC solution shows the highest ion conductivity, 2.0x10-4 S/cm at room temperature. |
