磺酸型双子表面活性剂的溶致液晶结构研究

Lytropic Liquid Crystalline Structures of a Sulfonic Acid-Containing Gemini Surfactant

合成了一种磺酸型双子表面活性剂6,6'-(丁基-1,4-二基双氧)双(3-壬基苯磺酸)(9BA-4-9BA),利用偏光显微镜和X射线衍射分析仪研究了其在水溶液和乙酸乙酯溶液中的溶致液晶结构变化.结果表明,9BA-4-9BA在两种溶剂及其混合溶剂中均可出现溶致液晶态结构,并且双子表面活性剂的溶致液晶相态与溶液浓度和溶剂种类密切相关.随着浓度增加,9BA-4-9BA水溶液溶致液晶结构由立方相经由片层立方相转变为层状液晶相,乙酸乙酯溶液中主要以层状液晶相存在.

The lytropic liquid crystalline structures of a novel sulfonic Gemini surfactant 6,6＇-（butane-1,4-diylbis（oxy））bis（3-nonylbenzenesulfonic acid）（9BA-4-9BA） were investigated using polarizing microscope and X-ray diffraction device. It was found that 9BA-4-9BA presented special lytropic liquid crystal patterns in different solvents, and the phase behaviors were closely related to the concentration and types of used solvents. With the increase of surfactant 9BA-4-9BA concentration in solvent, the phase patterns of 9BA-4-9BA in water transformed from cubic liquid crystal via cubic lamellar phase to lamellar liquid crystal phase, while 9BA-4-9BA in ethyl acetate mainly presented lamellar liquid crystal patterns.