聚环氧乙烷硫氰化钠络合物(PEO-NaSCN)离子导体电学性能的研究

本文研究了分子量为6.0×10³,1.2×10⁴和2.0×10⁴的PEO-NaSCN络合物的电学性能。分子量为6.0×10³和2.0×10⁴的样品,络合反应不完全,因而在第一次升温过程中,继续进行络合反应,导致电导率随温度变化的复杂行为。分子量为1.2×10³的样品,络合反应相当充分,因而电学性能不受热历史的影响,过量的PEO对电导率的大小及其随温度的变化行为有显著影响。分子量为1.2×10⁴的样品含有较多的过量的PEO,电导率最高,而且在PEO熔点附近,电导率突然增加。分子量为6.O×10³的样品,含的过量PEO最少,电导率最低,而且随温度连续变化。 关键词：

STUDY OF ELECTRICAL PROPERTIES OF POLY (ETHLENE OXIDE )-NaSCN POLYMER IONIC CONDUCTOR

The conductivities of three PEO-NaSCN samples whose molecular weight are 6000, 12000 and 20000 respectively have been studied as a function of temperature during two thermal cycles. It was found that the completeness of complex reaction in the samples had a obvious effect on the electrical behaviours. The complex reaction in molecular weight 12000 sample was complete, therefore the electrical property was not influenced by thermal history. While this reaction in the other two samples did not fully complete and can occure in certain temperature range during the first heating process, thus rather complicated log σ versus 1/T curves were observed. It was noted that the extra PEO content in the samples had a remarkable influence on the electrical property. Molecular weight 12000 sample contains more extra PEO content than the others. Therefore it has the highest conductivity and the logσ versus 1/T curve consists of two straight lines with a discontinuity at temperature near the melting point of pure PEO. While the extra PEO content in molecular weight 6000 sample is much less, it is responsible for the lowest conductivity and continual change of conductivity with temperature.