通过两步法合成了阳离子含亲水性咪唑离子基和疏水烷基链结构、阴离子相同的1-乙基-3-甲基咪唑醋酸盐([Emim]Ac)、1-丁基-3-甲基咪唑醋酸盐([Bmim]Ac)、1-己基-3-甲基咪唑醋酸盐([Hmim]Ac)3种离子液体。利用红外光谱对其进行结构表征,并探究温度对pH的影响;考察温度、离子液体质量浓度、有机溶剂对电导率的影响;测定临界胶束浓度和溶解性。结果表明,[Emim]Ac、[Bmim]Ac、[Hmim]Ac碱性递减,其在不同溶剂中的电导率随温度(28~60℃)的升高、离子液体质量浓度(6~20 g/L)的增加而增大,且受溶剂性质影响;临界胶束浓度分别为11.46、9.92 g/L和9.72 g/L;其溶解性随溶剂极性的增强、侧链烷基的伸长而增大。

Three kind of ionic liquids containing hydrophilic imidazole ionic group and hydrophobic alkyl chain structure with the same anions,including 1-ethyl-3-methyl-imidazole acetate (Ac),1-butyl-3-methyl-imidazole acetate (Ac),and 1-hexyl-3-methyl-imidazole acetate (Ac),are synthesized by two-step method.The structure of samples are characterized by means of infrared spectroscopy,and the influence rule of temperature on pH value is explored.The effects of temperature,mass concentration and organic solvent on electrical conductivity are investigated.Critical micelle concentration and solubility of the ionic liquids samples are determined.Results show that the alkalinity of Ac,Ac and Ac decreases in turn.Their electrical conductivity in different solvents increases with the increases of temperature (28-60℃) and mass concentration (6-20 g·L^-1),and is affected by the properties of the solvent.The critical micelle concentrations of Ac,Ac and Ac are 11.46 g·L^-1,9.92 g·L^-1 and 9.72 g·L^-1,respectively.The solubility increases with increasing polarity of solvent and elongation of side chain alkyl groups.

许玥(1996-),女,硕士研究生,主要从事精细化工相关研究,E1026804058@qq.com