通过流变学方法研究了水杨酸钠(NaSal)对Gemini阳离子表面活性剂2-羟亚丙基-1,3-双(二甲基十二烷基氯化铵)(以12-3(OH)-12(2Cl)表示)水溶液黏弹性能的影响。结果发现,无机盐诱导12-3(OH)-12(2Cl)产生盐析作用,而NaSal可促使胶束生长;在固定n(NaSal)/n(12—3(OH)-12(2Cl))=0.6,12—3(OH)-12(2Cl)质量摩尔浓度较低时,溶液的黏度很小;随12-3(OH)-12(2Cl)质量摩尔浓度增加,溶液黏度明显增大并显示Maxwell流体行为;溶液的零剪切黏度(η0)随12—3(OH)-12(2Cl)质量摩尔浓度增加有一个最大值出现,是因为体系中12—3(OH)-12(2Cl)的阳离子和水杨酸根(Sal-)反离子形成的氢键使棒状胶束之间相互连接,导致网络结构形成;测定的晶体结构验证了分子间氢键的形成。
Effect of addition of sodium salicylate (NaSal) on viscoelastic performance of aqueous solution of Gemini cationic surfactant 2 - hydroxy propylidene - 1,3 - bis (dimethyldodecylammonium chloride ) ( hereinafter refer to as 12 - 3 (OH) - 12 (2Cl)) was studied with rheological measurement. Results showed that the addition of an inorganic salt induces salting out of the 12 -3 (OH) -12 (2Cl), while NaSal promotes mieellar growth. At a fixed NaSal - to - surfactant molar ratio of 0.6, viscosity of the solution is very small at a rather low concentration of 12 -3 (OH) -12 (2Cl). Upon increasing the concentration, viscosity of the solution rises conspicuously and shows Maxwell fluid behavior. Following the increase of concentration of 12 - 3 (OH) -12 (2Cl), a maximum value of zero -shear viscosity (η0) appears. These trends can be attributed to the formation of a network structure between the cationic ions of 12 - 3 (OH) - 12(2Cl) and Sal - counter ion as the 12 - 3 ( OH ) - 12 ( 2Cl ) concentration increases. Crystal analysis further confirms the presence of structures linked by intermolecular hydrogen bonds.