离子液体嵌段共聚物的合成及其离子传导性

Synthesis and Ionic Conductivities of Ionic Liquid Block Copolymers

采用可逆加成-断裂链转移自由基聚合法(RAFT)合成了三嵌段共聚物聚甲基丙烯酸丁酯-b-聚对氯甲基苯乙烯-b-聚苯乙烯(PBMA_(69)-b-PVBC_(92)-b-PS_(345), PDI=1.5); PBMA_(69)-b-PVBC_(92)-b-PS_(345)经N-甲基咪唑季铵化后与锂离子盐发生离子交换,两步分别制得两种离子液体嵌段共聚物PBMA-b-PVBMImCl-b-PS和PBMA-b-PVBMImTFSI-b-PS,其结构经~1H NMR, FT-IR和GPC确证。采用交流阻抗研究了两种离子液体嵌段共聚物的导电性能。结果表明:PBMA-b-PVBMImCl-b-PS和PBMA-b-PVBMImTFSI-b-PS的离子电导率分别为6.0×10^(-4)S·cm^(-1)和1.6×10^(-3)S·cm^(-1)。

The triblock copolymer poly(butyl methacrylate)- b -poly[1-(chloromethyl)-4-ethenylbenzene]- b -poly(styrene)(PBMA 69 - b -PVBC 92 - b -PS 345 , PDI=1.5) was prepared by continuously reversible addition-fragmentation chain transfer polymerization(RAFT). Two ionic liquid copolymers, PBMA- b -PVBMImCl- b -PS and PBMA- b -PVBMImTFSI- b -PS were synthesized by the quaternary ammonium reaction of the triblock with 1-methylimidazole and then via the anion-exchange with lithium bis(trifluoromethanesulphonyl) imide. The structures were confirmed by 1 H NMR, FT-IR and GPC. The ionic conducting properties of PBMA- b -PVBMImCl- b -PS and PBMA- b -PVBMImTFSI- b -PS were investigated by AC impedance. The results shown that the ionic conducting rate of PBMA- b -PVBMImCl- b -PS and PBMA- b -PVBMImTFSI- b -PS were 6.0×10^-4 S·cm^-1 and 1.6×10^-3 S·cm^-1 , respectively.