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合成了基于烷基咪唑的乳酸离子液体[C4mim][Lact](1-丁基-3-甲基咪唑乳酸盐),并用1HNMR和DSC作了表征.由于乳酸离子液体和水易形成氢键,用通常的办法很难除去乳酸离子液体中的杂质水.为了排除杂质水的干扰,应用了标准加入法,配制一系列含有已知微量水的乳酸离子液体样品,在308.15～343.15K温度范围,用重量法测定了这些样品的密度,用最大气泡法测定了表面张力,用折光率确定了摩尔极化度,然后外推得到无水离子液体数据.在这些实验数据基础上,利用等张比容的加和性,估算了乳酸离子液体同系物[Cnmim][Lact](n=2,3,4,5,6)的表面张力、折射率、摩尔极化度、汽化焓和热膨胀系数,与实验数据相比有较好的一致性.
The synthesis of alkylimidazole-based lactic acid ionic liquid [C4mim] [Lact] (1-butyl-3-methylimidazolium lactate) and 1HNMR and DSC were characterized as lactic acid ionic liquid and water easy to form hydrogen bonds , It is difficult to remove impurity water from lactic acid ionic liquid by the usual method.In order to eliminate the interference of impurity water, a standard addition method was used to prepare a series of samples of lactic acid ionic liquid containing known trace water at the temperature range of 308.15 ~ 343.15K , The densities of these samples were determined by gravimetric method, the surface tension was measured by the maximum bubble method, the molar polarization was determined by the refractive index, and then the data of anhydrous ionic liquids were extrapolated.Based on these experimental data, , The surface tension, refractive index, molar polarizability, enthalpy of vaporization and coefficient of thermal expansion of lactate ionic liquid homologue [Cnmim] [Lact] (n = 2,3,4,5,6) Experimental data compared to a better consistency.