软段模型化合物对聚氨酯型固体电解质的影响

Effects of Soft-Segment Model Compound on Polyurethane Based Solid Electrolyte

以聚氨酯、高氯酸钠盐和软段模型化合物为组分 ,制备了一系列的聚氨酯型聚合物固体电解质 .利用红外光谱、差示扫描量热、复阻抗谱等手段对该体系进行了表征 .结果表明 ,软段模型化合物对所研究的聚氨酯 /软段模型化合物 /高氯酸钠盐复合体系中离子 -聚合物间相互作用、玻璃化转变温度、离子电导率均有显著的影响 .软段模型化合物聚乙二醇 (Mn=1 0 0 0 )的加入会引起体系玻璃化转变温度和离子迁移表观活化能的降低 ,导致聚氨酯硬段的聚集 .随着体系中软段模型化合物含量的增加 ,该固体电解质的电导率相应增加 ,室温下最高可达 1 0 μS/cm.

A series of solid electrolytes based on blends of polyurethane, NaClO 4 and soft segment model compound were prepared and their properties were characterized by means of FT IR, DSC and impedance analysis. The results demonstrate that soft segment model compound significantly influences the interaction between ion and polymer, T g and ionic conductivity of PEG PU PEG 12 system investigated. Due to the addition of soft segment model compound, PEG ( M n =1 000), the T g and ion transfer apparent activation energy decrease, and the aggregation of hard segment of polyurethane takes place. With increasing the content of soft segment model compound, the ionic conductivity of the system increases accordingly, and the maximum ionic conductivity of 10 μS/cm is obtained at room temperature.