Compatibility and dynamics of mixed micelles of polymer associates

本研究旨在探讨混合胶束的形成和有序化，重点关注两亲性聚合物形成的胶束的多样性行为中的“混合和多组分效应”。本文主要研究了各种疏水改性聚乙二醇的水溶液，并采用光散射、X射线散射和粘弹性等方法进行了研究。结果的内容分为以下三个方面：（A）稀溶液中的混合胶束，（B）由混合胶束组成的溶致液晶，和（C）具有多个缔合部分的两亲性物质的凝胶化和混合胶束化。主要结果如下。对于（A），（1）当将自身形成球形胶束的那些添加到绳型胶束中时，随着所添加的表面活性剂的组成增加，胶束在一定组成下转变为过渡球形。（2）这种形状变化与W 关于我们 与本地化的客体分子在胶束的末端，这是通过基于自洽场（SCF）计算的计算模拟证实。对于（B），（3）我们可以清楚地观察到各向同性到液晶相变作为溶胶-凝胶转变的机械测量。（4）六方液晶相对于客体表面活性剂的引入是相对稳定的，客体表面活性剂在稀溶液中倾向于形成球形胶束。(5)To相反，通过引入客体表面活性剂，立方相变得容易不稳定。（6）计算了液晶相的堆积密度和缔合数随组成的变化关系，并利用SCF计算结果进行了讨论。(7)In在（A）和（B）的两种情况下，我们发现不同化学结构的核之间具有良好的相容性。至于（C），（8），我们已经观察到二嵌段型和三嵌段型表面活性剂之间的共缔合，在两种组分上形成桥砂环。少

This research project aims to investigate the formation and ordering of mixed micelles with focusing our attention to "mixing and multi-component effects" in the diverse behavior of micelles formed by amphiphilic polymers. We mainly dealt with aqueous sol utions of various hydrophobically-modified poly(ethyleneglycol)s, and used the means of light scattering, x-ray scattering, and viscoelasticity. Contents of the results are classified into the following three issues ; (A)mixed micelles in dilute solution, (B)lyotropic liquid crystals consisting of mixed micelles, and (C)gelation and mixed micellization in amphiphilic substances having multiple associative moieties. Main results obtained are as follows. As for (A), (1)when those which form spherical micelles by themselves are added to the string-type micelles, the micelles change their shapes to be spherical transitionally at a certain composition with increasing composition of the added surfactant. (2)This shape change is associated w … More ith the localization of the guest molecules at the ends of a micelle, which was confirmed by computational simulations based on the self-consistent field(SCF) calculation. As for (B), (3)we can clearly observe the isotroic to liquid-crystal phase transition as a sol-gel transition by mechanical measurements. (4)The hexagonal liquid crystalline phase is relatively stable for the incorporation of guest surfactants which tend to form spherical micelles in dilute solution. (5)To the contrary, the cubic phase becomes easily unstable by the incorporation of guest surfactants. (6)Packing density and association number in the liquid crystalline phase have been evaluated as a function of composition, and discussed with using the results of SCF calculations. (7)In both cases of (A) and (B), we have found good compatibitities between cores of different chemical structures. As for (C), (8)we have observed co-associations between diblock-type and triblock-type surfactants making bridge sand loops over the two components. Less