NMR study of the interaction between anionic and nonionic surfactants in their mixed micelles. II
NMR study of the interaction between anionic and nonionic surfactants in their mixed micelles. II
复制标题
阴离子和非离子表面活性剂在混合胶束中相互作用的核磁共振研究。
DOI：
10.1016/0021-9797(72)90120-8
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
K. Tsujii
中科院分区：
文献类型：
--
作者：
F. Tokiwa;K. Tsujii
在以前的工作中，两种不同的表面活性剂在它们的混合胶束中的相互作用已被系统I的NMR测量所研究。研究工作扩展到了以下体系II、III和IV：当阴离子表面活性剂加入到C12POE或C12POES溶液中时，C12POE或C12POES的聚氧乙烯链的质子共振信号向高磁场方向移动，高磁场移动的程度取决于聚氧乙烯链的长度和两种表面活性剂的摩尔比。聚氧乙烯信号的这种高场位移可以归因于阴离子表面活性剂的苯环与C12POE或C12POES的聚氧乙烯链之间的相互作用。在前三个系统中，相互作用的程度按系统I > II > III的顺序减小。在系统II和III中观察到的高场位移表明烃链在混合胶束的烃内部是相当移动的。在系统IV中，相互作用的程度小于系统I。这说明在混合胶束中，C12POES分子的聚氧乙烯链由于其离子头的排斥作用而比C12POE分子的链更长，聚氧乙烯链的延长可能不利于与C8φS分子苯环的相互作用.
In the previous work, the interaction of two different surfactants in their mixed micelles has been studied by NMR measurements of System I. The work has been extended to the following Systems II, III and IV: When the anionic surfactant is added to C12POE or C12POES solutions, the proton resonance signal of the polyoxyethylene chain of C12POE or C12POES shifts to a higher magnetic field, the extent of the upfield shift depending on the polyoxyethylene chain length and the molar ratio of the two surfactants mixed. This upfield shift of the polyoxyethylene signal can be ascribed to an interaction between the benzene ring of the anionic surfactant and the polyoxyethylene chain of C12POE or C12POES. In the first three systems, the degree of the interaction decreases in order of System I > II > III. The upfield shift observed in Systems II and III suggests that the hydrocarbon chains are fairly mobile in the hydrocarbon interior of the mixed micelle. In System IV, the degree of the interaction is smaller than that in System I. This is interpreted as showing that in the mixed micelle, the polyoxyethylene chains of C12POES molecules are more extended than the chains of C12POE molecules because of the repulsion of their ionic heads, and the extension of the polyoxyethylene chains is probably less favorable to the interaction with the benzene rings of C8φS molecules.