星形网状聚合物电解质的制备及其离子导电性研究

Synthesis of star network solid polymer electrolytes and study on its ionic conductivity

聚乙二醇(PEG,M_n=400,600),季戊四醇与CH_2Cl_2在碱性条件下,通过Williamson反应合成以季戊四醇为核、以聚氧化乙烯的嵌段物为臂的星形网状聚合物。FTIR和~1H-NMR分析表明,聚合物分子为C[CH_2-OCH_2O-(CH_2CH_2O)_n-CH_2O-]_4的重复单元结构。季戊四醇的加入明显地改善了聚合物电解质的成膜性、力学性能和热稳定性。对聚合物电解质进行交流阻抗导电性研究表明：在25℃,离子电导率随着锂盐浓度的变化相继出现两个峰值,当w(Li- ClO_4/聚合物)=8%时,离子电导率达1．03×10^(-4)S/ cm；离子电导率随着温度的升高而迅速增加,且呈非Arrhenius变化。

Star network polymer was systhesized by polyethylene glycol （PEG, Ma = 400,600）, pentaerythritol and CH2Cl2 with the existence of alkaline. FTIR and ^1H-NMR measurement demonstrated that the polymer repeating unit was C[CH2-OCH2O-（CH2CH2O）n-CH2O-]4. the polymer with pentaerythritol was star network, with improving the film processability, mechanical properties and thermal stability properties. AC impedance was used to investigate ionic conductive property of solid polymer electrolytes, the results demonstrated that the plot of conductivity vs. salt concentration showed two peaks at 25℃ ,when w（LiClO4/polymer）=8% ,the highest ionic conductivity attained 1.03 × 10^-4 S/cm; the ionic conductivity increased with increasing temperature, and the curve didn＇t coincided with Arrhenius formula.