表面活性剂复配体系表面扩张流变性质研究

Study on Surface Dilational Rheological Properties of Mixed Surfactant System

利用Langmuir槽法研究了阴离子型表面活性剂和非离子表面活性剂复配体系的扩张流变性质.实验发现:低分子量的阴离子型表面活性剂和非离子表面活性剂的表面扩张模量均随频率增大而升高,相角则随频率增大而降低,扩散交换过程起决定作用.结构不匹配的阴离子-非离子复配体系不存在协同效应,表面膜的强度没有得到显著提高,模量介于两种纯组分之间.

The interfacial dilational rheological properties of the mixed systems of anionic suffactant SDBS and nonionic surfactants were investigated using Langmuir trough method. The results show that for suffactants with low molecular weights the dilational modulus increases, while phase angle decreases, with increasing frequency, which indicates the diffusion-exchange process dominates the properties of films. The mixed systems of anionic surfactant and nonionic surfactants have no obvious synergistic effect because of their mismatch structure. As a result,the moduli of the mixed systems lie between two pure components.