| 张欢欢,刘玉婷,李 戎,邢彦军.化学通报,2015,78(1):73-79. |
| 新型低共熔溶剂的制备、表征及物性研究 |
| Synthesis and Characterization physical properties of Novel Deep Eutectic Solvents |
| 投稿时间：2014-04-25 修订日期：2014-06-09 |
| DOI： |
| 中文关键词: 低共熔溶剂 离子液体 二元羧酸 制备 物理性质 |
| 英文关键词:Deep eutectic solvents, Ionic liquid, Dicarboxylic acid, Preparation, Physical Properties |
| 基金项目:国家科技支撑计划（2012BAK30B03）和中央高校基本科研业务费专项资金资助(2232013A3-05和CUSF-DH-D2013048) |
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| 中文摘要: |
| 以氯化1-丁基-3-甲基咪唑（[Bmim]Cl）和二元羧酸为原料，以不同摩尔比混合制备了一类新型低共熔溶剂，采用红外对 [Bmim]Cl和二元羧酸之间的作用进行了分析。分别测定了其粘度、电导率、密度、折射率等物理性质，并研究了温度、二元羧酸结构和摩尔比对这些物理性质的影响。结果表明，新型低共熔溶剂的粘度随温度的升高而降低，电导率随温度的升高而增加。温度对二者的影响可以采用VTF方程进行精确地拟合。新型低共熔溶剂的密度随温度的升高而呈线性下降。对新型低共熔溶剂的过量摩尔体积进行了计算。结果表明，过量摩尔体积均为正值，二元羧酸对过量摩尔体积的贡献远大于[BMIM]Cl，而结构特性的贡献多于物理作用。折射率和密度随二元羧酸碳数的变化趋势基本相似。 |
| 英文摘要: |
| Novel deep eutectic solvents (DES) were prepared using 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) and dicarboxylic acids (malonic acid, succinic acid, glutaric acid or adipic acid) at different molar ratios (1:0.5 or 1:1). All DES are colorless transparent liquid at room temperature. The physical properties of DES, such as viscosity, conductivity, density and refractive index were determined. The influence of temperature, carbon number of dicarboxylic acids and molar ratio of dicarboxylic acids in DES system on the physical properties was investigated. The results showed that the viscosity decreased rapidly with increasing of temperature. The conductivity also increased with increasing of temperature. The carbon number of dicarboxylic acids showed different influence on viscosity and conductivity according to molar ratio, with odd-even effect and packing effect being the main factor. The temperature dependence of viscosity and conductivity was investigated through systemically quantitative analysis using Arrhenius equation and VTF equation. The activation energy of viscous flow (E?, 48~84 kJ?mol-1) and activation energy of the ionic conductivity (Eσ, 37~73 kJ?mol-1) were calculated by Arrhenius plots. In the temperature range of 298.15~333.15K, the temperature dependence of viscosity and conductivity both showed a well accordance with VTF models (all R>0.9999) than Arrhenius models. The densities of DES also decreased linearly with increasing of temperature. Excess molar volumes (VE) of DESs were all positive. The contribution of dicarboxylic acids on VE is more than [Bmim]Cl. The refractive index of DES (at 298.15K) decreased with increasing of molar ratio of dicarboxylic acids in DES system. The refractive indexes showed a similar trend to densities with increasing of carbon number in dicarboxylic acids. |
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