摘要
为了进一步提高聚氨酯 /盐复合体系的离子电导率 ,合成了聚氧化乙烯聚氨酯 (PEU)和超支化聚缩水甘油 (HPG) ,并与高氯酸锂掺杂得到聚氨酯固体电解质 .样品成膜后利用红外光谱、DSC和复阻抗谱分析进行了表征 .红外分析发现 ,随氧锂原子比 [EO]/[Li]的减小 ,醚氧键的吸收峰发生红移 ,高氯酸根谱带则向高频方向移动 .DSC和复阻抗谱分析表明该体系是非晶相材料 ,HPG的加入提高了聚氨酯体系的电导率 .室温 (2 0°C)下 ,[EO]/[Li]=4～ 6时其最佳电导率σ达到 8.5μS/cm.该体系温度和电导率的关系既不完全符合 Arrhenius方程 ,也不完全符合 VTF方程 ,而是呈现较为复杂的曲线关系 ,这可能与
Polyurethane/hyperbranched poly(glycidol)/lithium salt complexes were prepared and characterized by FT IR, DSC and impedance measurement. IR analysis shows that the ether group shifts to low wave number with the increased salt content. This suggests that the coordinate degree of lithium cation with ether group increases with salt concentration. And the spectrum peak of ClO - 4 shifts to high wave number with the increased salt content. This suggests that the peak of ClO - 4 free ion decreases and the peak of ClO - 4 inion pairs increases with the salt concentration. The DSC analysis and impedance measurement suggest that the complexes are amorphous. The addition of HPG enhances the ionic conductivity of the complexes for it increases further mobility of polymer segments and the solubility of lithium salt in the system. The optimum conductivity at room temperature is 8.5 μS/cm with [EO]/[Li]=4~6. The conductivity increases with temperature and the dependence of ionic conductivity on temperature fits neither the Arrhenius equation nor the VTF equation. This is attributed to the addition of HPG.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2001年第4期574-577,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目! (5 990 30 0 4)
