亲水头基大小对正负离子表面活性剂混合体系的影响

<正>负离子表面活性剂混合体系曾被认为是表面活性剂配方的禁忌,但通过增大表面活性剂头基的面积,正负混合体系在很宽的物质的量比下都不会产生沉淀,而且还会产生显著的增效效应。头基大的离子型表面活性剂甚至能够用来增溶难溶的反电荷表面活性剂。

Effect of the Hydrophilic Head Group Size of Surfactant on the Mixed Systems of Oppositely Charged Surfactants

The mixed systems of a cationic and an anionic surfactant have been suggested to be avoided since they were prone to forming precipitates. However, increasing the head group size of the surfactants, the mixed systems would not form precipitates in a large mixing ratio, and strong synergetic effect can be produced. The surfactant with large head group may even be able to increase the water solubility of an oppositely charged surfactant.