The structural transformations of charged spherical surfactant micelles of potassium oleate upon solubilization of water-insoluble polymer poly(4-vinylpyridine) were studied in salt-free aqueous solutions by several complementary techniques including SANS with contrast variation, NMR (1H and 2D 1H NOESY) spectroscopy, dynamic light scattering, cryo-TEM, and fluorescence spectroscopy. By SANS it was shown that solubilization of polymer in the micelles results in the formation of complexes with necklace structure, where the mean distance between the micelles bound to polymer (beads) is governed by electrostatic repulsion between them. The polymer penetrates deep into the hydrophobic core of the beads and occupies ca. 60% of their volume. As a result, the average number of surfactant ions in the micelles decreases from 60 till 20. The bound charged micelles impart water solubility to the polymer-surfactant system, and it behaves like a polymer coil in a thermodynamically good solvent.

中文翻译：

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带电球形表面活性剂胶束在无盐水溶液中溶解水不溶性聚合物链的结构转变


通过几种互补技术，包括对比变化的 SANS、NMR（1H 和 2D 1H NOESY）光谱、动态光散射、冷冻透射电和荧光光谱，研究了油酸钾带电球形表面活性剂胶束在水不溶性聚合物聚（4-乙烯基吡啶）溶解后的结构转变。SANS 表明聚合物在胶束中的溶解导致形成具有项链结构的复合物，其中与聚合物（珠子）结合的胶束之间的平均距离由它们之间的静电排斥决定。聚合物深入磁珠的疏水核心，约占其体积的 60%。结果，胶束中表面活性剂离子的平均数量从 60 个减少到 20 个。结合的带电胶束赋予聚合物-表面活性剂系统水溶性，它的行为类似于热力学良好溶剂中的聚合物线圈。