[bmim][BF_4]、[bmim][PF_6]离子液体及其与DMF二元体系在293.15～338.15K下的粘度

The Viscosities of [bmim][BF_4] and [bmim][PF_6] Ionic Liquids and Their Binary Systems with N,N-Dimethylformamide

为获得离子液体与有机物物理性质的数据,常压下,293.15～338.15 K温度范围内,分别测定了1-丁基-3-甲基咪唑四氟硼酸盐([bmim][BF4])、1-丁基-3-甲基咪唑六氟磷酸盐([bmim][PF6])2种咪唑类离子液体以及它们和N,N-二甲基甲酰胺(DMF)构成的2个二元体系的粘度,采用Vogel-Tamman-Fulcher(VFT)方程和Arrhenius-like方程对所测粘度数据进行关联。结果表明,同一温度下,3种纯溶液粘度大小顺序依次为:DMF<[bmim][BF4]<[bmim][PF6]。[bmim][BF4]、[bmim][PF6]离子液体及其与DMF构成的二元体系的粘度均随着温度的升高和DMF摩尔分率的增加而降低。实验条件下,DMF+[bmim][BF4]和DMF+[bmim][PF6]二元体系的粘度变化范围分别为1.26～125.5 MPa·s和1.11～165.7 MPa·s。VFT方程对于DMF-[bmim][BF4]与DMF-[bmim][PF6]体系的关联结果比Arrhenius-like方程较好,其总平均绝对误差、总平均相对误差、以及总平均标准方差分别为0.561 9 MPa·s和0.918 6 MPa·s、0.026 8 MPa·s和0.020 9 MPa·s、0.725 5 MPa·s和1.125 1 MPa·s。

In order to obtain the data of the physical properties for ionic liquids and organic,the viscosities of two imidazolium-based ionic liquids,1-butyl-3-methylimidazole tetrafluoroborate（） and 1-butyl-3-methylimidazolium hexafluorophosphate（）,and their binaries with N,N-dimethylformamide（DMF） at the temperature range from 293.15 K to 343.15 K in atmospheric pressure were determined,respectively,and the viscosity datas were correlated by the Vogel-Tamman-Fulcher（VFT） and Arrhenius-like equation.The results showed that the viscosities of the three pure solutions were in sequence： DMF ,and the viscosities for and ionic liquids and their binary systems with DMF all decreased with the increase of temperature and the mole fraction of DMF.The range of the viscosities of binary systems of DMF- and DMF- were from（1.26 to 125.5） and（1.11 to 165.7） MPa·s,respectively,in the experimental conditions.The correlation results based on the VFT equation for binary systems of DMF- and DMF- were found to be more satisfactory than the Arrhenius-like equation.The total mean absolute deviations,total mean relative deviations,and total mean standard deviations were estimated to be 0.561 9 MPa·s and 0.918 6 MPa·s,0.026 8 MPa·s and 0.020 9 MPa·s,0.725 5 MPa·s and 1.125 1 MPa·s,respectively.