聚乙二醇和月桂酸钠的相互作用

THE INTERACTION BETWEEN POLYETHYLENE GLYCOL AND SODIUM LAURIC ACID

用粘度、电导率、核磁共振的方法探讨了聚乙二醇（ＰＥＧ）与月桂酸钠（Ｒ１１ＣＯＯＮａ）的相互作用．结果表明，ＰＥＧ与Ｒ１１ＣＯＯＮａ在水溶液中发生相互作用形成了复合物，混合溶液的粘度表现出聚电解质的粘度行为，电导率曲线出现两个临界浓度：Ｔ１（ＣＡＣ），Ｔ２（吸附达饱和的浓度）；体系中ＰＥＧ浓度越高，Ｒ１１ＣＯＯＮａ的解离度越大；核磁共振研究表明，ＰＥＧ分子链的一部分穿过Ｒ１１ＣＯＯＮａ的胶束，形成项链状结构，另一部分深入到溶液内部．

The interaction between polyethylene glycol (PEG) and sodium lauric acid (R11COONa)was studied by means of viscosimetry,conductivity measurement and HNMR techniques.The results indicate the PEG/R11COONa complex was formed in this mixed system.The viscosity of the mixed solution expresses the behaviour of polyelectrolyte.The two critical concentration (T1,T2)resulted from conductivity measurement agree with the result of the 1 HNMR. 1 HNMR study supports the view that PEG runs across the R11COONa semimicelles,then form the necklacelike structure.