1-丁基-3-甲基咪唑硫酸氢盐离子液体水溶液的密度、黏度与温度、组成的关系

Temperature and Composition Dependence on the Density and Viscosity of Aqueous Solutions of 1-Butyl-3-Methylimidazolium Hydrosulphate Ionic Liquid

合成了1-丁基-3-甲基咪唑硫酸氢盐离子液体([Bmim]HSO 4),在常压和303.15~333.15 K的温度范围内测定了该离子液体水溶液的密度和黏度,分别计算出过量摩尔体积和黏度偏差,并采用Redlich-Kister方程对过量摩尔体积和黏度偏差进行拟合。结果表明:随着水的摩尔分数增加、温度升高,[Bmim]HSO 4水溶液的密度和黏度均减小,过量摩尔体积和黏度偏差在全部水摩尔分数范围内均为负值;Redlich-Kister四阶方程可以很好地拟合该二元体系的过量摩尔体积和黏度偏差;离子液体水溶液的密度和黏度性质受离子液体阴-阳离子之间的相互作用以及离子液体与水之间形成的氢键作用的影响。

1-Butyl-3-methylimidazolium hydrosulphate ionic liquid([Bmim]HSO 4)was synthesized,and the densities and viscosities of binary mixtures([Bmim]HSO 4+water)with different compositions were determined under the atmospheric pressure and at temperatures from 303.15 to 333.15 K.The excess molar volume and viscosity deviation for the binary systems were calculated and correlated by Redlich-Kister polynomial equation,respectively.The results show the densities and viscosities of the binary systems both decrease with increasing temperatures and the molar fraction of water,and the excess molar volumes and viscosity deviations of the binary systems are all negative over the whole composition range.Good correlations of the composition dependence are achieved by fitting the excess molar volumes and the viscosity deviations to forth-order Redlich-Kister polynomials.The interactions between anions and cations and hydrogen bonds between ionic liquid and water have a major influence on the density and viscosity of aqueous solutions of[Bmim]HSO 4.