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合成了两种咪唑基表面活性离子液体,通过界面膨胀流变法研究了其在气/液界面的聚集行为,考察了咪唑基表面活性离子液体浓度、无机盐和温度对聚集行为的影响。研究发现,咪唑基表面活性离子液体在吸附过程中吸附控制占主导作用,而弛豫过程不是单一指数函数;加入无机盐或升高温度可以提高咪唑基表面活性离子液体的表面活性、增强其在界面的吸附能力、降低表面张力。扩张流变结果显示扩张模量、弹性模量和粘性模量随震荡频率增加而增加;随表面活性离子液体浓度增大,扩张模量先增大后减小。扩张模量随温度升高或无机盐(NaBr或CaBr_2)的加入而降低。表面活性离子液在气/液界面形成的吸附膜以弹性模量为主,而且C_(14)mimBr的界面膜弹性模量大于C_(12)mimBr的界面膜弹性模量。
Two kinds of imidazolyl-based surface-active ionic liquids were synthesized. The aggregation behavior at the air / liquid interface was studied by interfacial swelling rheometry. The effects of imidazole-based surface active ionic liquid concentration, inorganic salts and temperature on the aggregation behavior were investigated. It was found that the adsorption control of Imidazolium surface active ionic liquids dominates in the adsorption process, while the relaxation process is not a single exponential function. Adding inorganic salts or increasing the temperature can increase the surface activity of Imidazole-based Ionic Liquids The adsorption capacity of the interface reduces the surface tension. The results of dilation rheology showed that the dilatational modulus, elastic modulus and viscous modulus increased with the increase of oscillation frequency. With the increase of the concentration of surfactant ionic liquid, the dilatancy modulus first increased and then decreased. The expansion modulus decreases with increasing temperature or the addition of inorganic salts (NaBr or CaBr 2). The adsorption film formed by surface active ionic liquid at the gas / liquid interface is mainly composed of elastic modulus, and the elastic modulus of the interface membrane of C14mimBr is larger than the elastic modulus of the interface membrane of C12mimBr.