[BMim][HSO_4]/H_2SO_4二元体系的黏度及其表面张力

Viscosity and surface tensions of [BMim][HSO_4]/H_2SO_4 binary system

测定了1-丁基-3-甲基咪唑硫酸氢盐([BMim][HSO_4])/H_2SO_4二元体系在293.2~313.2 K的黏度和表面张力。采用Jouyban-Acree(JAM)模型与Li-Wang(LWW)模型拟合了该体系的黏度与表面张力,并利用Redlich-Kister(R-K)方程和Myers-Scott(MS)公式拟合了体系的超额黏度与超额表面张力。实验结果表明,[BMim][HSO_4]/H_2SO_4二元体系的黏度随温度的升高而下降;随[BMim][HSO_4]的摩尔含量(x_(IL))的增加而增大;体系的超额黏度为负值,当x_(IL)≈0.75时,超额黏度最低。二元体系的表面张力随温度的升高而略有降低,随x_(IL)的增加而降低;超额表面张力均不大于0,x_(IL)≈0.1时,超额表面张力最小。JAM模型和LWW模型可用于拟合二元体系的黏度与表面张力,平均相对误差低于8.74%和0.16%。R-K方程和MS公式可用于拟合二元体系的超额黏度与超额表面张力,拟合回归相关系数R^2不低于0.99和0.97。

At the range of 293.2-313.2 K, the viscosities and surface tensions of 1-butyl-3- methylimidazolium hydrogen sulfate（ [ BMim] [ HSO4] ）/H2SO4 binary system were measured and calculated by Jouyban-Acree（JAM） and Li-Wang（LWW） equation respectively. The excess viscosities and excess surface tensions of the binary system were fitted by Redlich-Kister（R-K） and Myers-Scott（MS） equation separately. The results show that the viscosities of[BMim] [HSO4]/ H2SO4 decreased with the increasing temperature and increased with the increasing molar fraction of [ BMim] [HSO4] （xIL）. The excess viscosities of the binary system are negative and reach minimum at xIL≈ 0.75. The surface tensions of the binary system decrease slightly with increasing temperature and xIL. The surface tensions of the binary system are negative and reach minimum at xIL≈ 0.1. The viscosities and surface tensions of the binary system are fitted well by JAM and LWW equation. The relative standard deviations are no more than 8.74% and 0.16%, respectively. R-K and MS equation describes the excess viscosities and excess surface tensions of the binary system well, both of their correlation coefficient R2 are not less than 0.99 and 0.97 separately.