温度对氯化胆碱/多元醇型低共熔溶剂物性的影响

合成了4 种氯化胆碱多元醇型低共熔溶剂, 并在303～343 K 时分别测定了4 种低共熔溶剂的密度、黏度、电导率等物性随温度变化的规律. 结果表明: 4 种低共熔溶剂的密度随温度的变化均符合简单的线性关系, 黏度随温度的升高而下降, 电导率随温度的升高而快速增加; 无论是黏度还是电导率, 它们与温度的关系均较好地符合阿伦尼乌斯指数关系. 另外, 根据阿伦尼乌斯公式计算了4 种低共熔溶剂的黏度活化能和电导率活化能, 并采用循环伏安法测定了333 K 时4 种低共熔溶剂的电化学窗口.

Effect of temperature on physic-chemical properties of deep eutectic solvent based on choline chloride and polyols

Four kinds of deep eutectic solvents (DESs) based on choline chloride and polyols  were prepared. Density, viscosity and conductivity of the four DESs were measured as  functions of temperature in the range of 303～343 K. The results show that the densities of the four DESs sare linearly dependent on temperature. Viscosities decrease with  increasing temperature, and conductivities increase rapidly with increasing temperature,both obeying the Arrhenius exponential law. The activation energy of viscosity and conductivity  were calculated with the Arrhenius formula. The electrochemical windows of the  four DESs were also tested by using cyclic voltammetry at 333 K.