梳状聚合物电解质的力学松弛时间

以苯乙烯 /马来酸酐共聚物为骨架 ,聚乙二醇单甲醚为侧链合成了 3种不同侧链长度的梳状高分子聚合物 ,制成了锂盐络合物薄膜 .动态力学性能研究结果表明 ,本体系是主链刚性、侧链较柔软的梳状接枝聚合物 .应用时间温度等效原理 ,选择Tα 作为参考温度 ,建立了主曲线 ,得到了移动因子图和等自由体积图 .Williams、Landel和Ferry(WLF)经验方程的两个参数C1、C2 随着盐浓度增加而增大 .若T0 =50℃作为参考温度 ,平均松弛时间lgτc 与锂盐浓度C呈线性关系 .随着侧链分子量增加 ,主曲线向高频率移动 ;平均松弛时间lgτn 与侧链分子量的关系也是线性的 ;另外随着盐的不同 ,主曲线也会产生移动 ,表明盐种类对松弛时间产生影响 .

MECHANICAL RELAXATION TIME OF COMBLIKE POLYMER ELECTROLYTE

Using poly(styrene|%co\%|maleic anhydride) as the backbone and poly(ethylene glycol) methyl ether as side chains,three kinds of comblike polymers of different side chain length were synthesized.The Lisalt complexes and their films were prepared.The dynamic mechanical properties were investigated.It was found that the main chain was rigid and the side chain was flexible in this comblike polymer system. Based on the time temperature equivalence principle,a master curve was constructed.By selecting T α as reference temperature,Arrhenius plots of shift factor and iso\|free\|volume plots were attained.The values of WLF parameters C\-1 and C\-2 increase with increasing salt concentration. By reference to T 0=50℃,the relation between the average relaxation time lgτ-c and Lisalt concentration C is linear. The master curves are displaced progressively to higher frequencies as the M w of side chains is increased. The relation between the average relaxation time lgτ n and M w of side chains is also linear.And the master curves are movable with the change of salts.It shows the effect of different kinds of salt on relaxation time.