空气/水界面2,5-二丙基-4-十一烷基苯磺酸钠的表面动态扩张流变性质

利用悬挂滴方法研究了2,5-二丙基-4-十一烷基苯磺酸钠(3-11-3)在空气/水界面上的动态扩张粘弹性质, 考察了时间、表面压、工作频率及3-11-3的浓度对扩张模量和相角的影响. 研究结果表明, 低表面压条件下, 表面膜以弹性为主, 分子在表面上的状态决定膜性质；高表面压条件下, 分子在体相和表面间的交换过程决定膜性质, 表面膜以粘性为主.

Dynamic Dilational Properties of 2,5-dipropyl-4-undecylbenzene Sulfonate at the Air/Water Interface

The dynamic dilational viscoelaticity properties of sodium 2,5-dipropyl-4-undecylbenzene sulfonate (3-11-3) at air/water interface were investigated by drop shape analysis. The influences of time,surface pressure,dilational frequency and concentration on surface dilational modulus and phase angle were explored. The experiment results showed that the film was elastic in lower surface pressure range,which was believed to be dominated by the in-surface process. In contrast,the viscous behavior become noticeable in higher surface pressure range,which indicates the diffusion-exchange process between bulk and surface dominates the nature of film.