阴离子表面活性剂与非离子水溶性大分子二元体系的临界类胶束聚集数

Critical Aggregation Number of Pseudo-micelle in Binary Systems of Anionic Surfactants and Water-soluble Nonionic Macromolecules

将对应于γ～ lgc双拐点体系第一拐点 c1 的 Np 定义为第一临界类胶束聚集数 [Np]1 .实验结果表明 ,[Np]1 是依赖于表面活性剂结构以及大分子结构的不变量或结构本征值 。

Interaction in binary systems of anionic surfactants and water-soluble nonionic macromolecules was studied by means of steady-state fluorescence quenching. The above binary systems were composed of sodium dodecyl sulfate(SDS) or sodium dodecane sulfonate(AS) with polyethyleneglycol(PEG) or polyvinylpyrrolidone(PVP). The occurrence of aggregates in the above systems was deduced from the detected pseudo-micelle aggregation number N p. It was discovered that N p is simply increased linear with increasing surfactant concentration c. 1 is defind as the first critical aggregation number of the pseudo-micelle corresponding to c 1 in γ-lgc curves. The experimental results show that 1 for a certain type of macromolecule is eventually not changed with the change of molecular weight and concentration of macromolecule. Thus 1 seems to be an invariant or a structural eigenvalue which depends solely on the molecular structure of both surfactant and macromolecule.