梳状高分子固体电解质的二级玻璃化转变及离子传输研究

Study on the Two Class Glass Transition and Ion Transport of A Comb Polymer Electrolyte

研究了交替马来酸酐共聚物多缩乙二醇酯(CP350)-LiSCN配合物的热行为及离子传输特性.实验表明:CP350/LiSCN配合物在所研究[Li]/[EO]配比范围呈均相无定形并具有二级玻璃化转变.两种玻璃化转变温度均随盐含量的增加而上升.离子电导率随盐浓度的变化而出现一极大值,室温电导率最大可达2.19×10^(-5)S/cm.导电行为符合VTF方程.

The thermal behaviour and ion - transport properties of a comb polymer electrolyte CP350/LiSCN based on methyl vinyl ether/maleic anhydride copolymer with oligo - oxyethylene side chains were studied by means of DSC and ac impedance method. The two glass transition temperatures which can be attributed to side chains and main chains respectively were found to increase with increasing salt concentration. Conductivities which displayed non - Arrhenius behaviour were analyzed by using Vogel - Tammann - Fulcher equation and interpreted on the basis of the configurational entropy model derived by Gibbs and coworkers. The optimum ionicconductivity at 25℃ achieved was 2.19 × 10-5S/cm.