新型树枝状非离子表面活性剂的温度与盐效应研究

Temperature and salt effect on the properties of novel dendritic nonionic surfactant

以3.0代聚酰胺-胺(PAMAM G-3.0)为起始剂,合成了一种新型树枝状非离子表面活性剂。通过表面张力与稳态荧光法研究了其在水溶液和无机盐溶液中的表面性质与聚集行为,并考察了温度对其性质的影响。结果表明,随着温度的升高,表面活性剂的表面张力逐渐降低,但在研究的温度范围内,临界胶束浓度(CMC)的变化不大。当加入质量浓度为1.0%的NaCl、NaBr及Na2SO4时,均使其表面张力增大;而3种无机盐的加入,对表面活性剂CMC的影响不大。

With 3.0 G poly（amido-amine） （PAMAM G-3.0） as the initiator, a novel dendritic nonionic surfactant was synthesized. Surface properties and aggregation behaviors, both in aqueous and inorganic salt solutions were studied by surface tension and steady state fluorescence measurements. The effect of temperature on the surface properties was investigated. The results showed that, with the increase of temperature,the surface tension value was decreased but critical micelle concentration （CMC） values were not changed a lot. In the case of each inorganic salt, NaCl, NaBr or Na2SO4, at the concentration of 1.0% ,the surface tension value increased,but the CMC values changed little.