氯化胆碱-尿素低共熔离子液体的粘度和电导率

The viscosity and conductivity of choline chloride-urea ionic liquids

在常压下298 353 K温度范围内分别测定氯化胆碱-尿素离子液体的粘度和电导率,研究温度、乳酸、水对其粘度、电导率的影响规律.结果表明,在所研究的温度范围内,离子液体具有较低的粘度和较好的导电性,粘度随温度的升高而减小,电导率随温度的升高而增大,粘度、电导率随温度的变化规律均符合Arrhenius经验公式和VTF方程,由此计算得到粘滞活化能、电导活化能,且粘度与电导率之间的关系符合Walden规则.乳酸、水的加入使离子液体的粘度减小、电导率增大,且随温度的升高,其含量对粘度的影响不再明显.

The viscosity and conductivity of choline chloride urea ionic liquids were measured in the298-353K temperature range at atmospheric pressure,and the effect of temperature,lactic acid and water on the viscosity and conductivity of the liquid was investigated.The results show that the ionic liquids have lower viscosity and better conductivity,and the viscosity decreases with the increase of temperature.With the increase of the temperature,the viscosity and conductivity varies with the temperature is in accord with the Arrhenius empirical formula and VTF equation,and the relationship between viscosity activation energy and conductivity activation energy is obtained,and the relation between viscosity and conductivity conforms to Walden rule.The addition of lactic acid and water to the viscosity of ionic liquids decrease and the conductivity increase,and the effect of the content on viscosity and conductance is no longer apparent.