Compatibility and dynamics of mixed micelles of polymer associates

本研究旨在研究混合胶束的形成和有序性，重点关注两亲性聚合物形成胶束的不同行为中的“混合和多组分效应”。我们主要研究了各种疏水改性的聚乙二醇水溶液，并用光散射、X射线散射和粘弹性等手段进行了研究。结果分为以下三个问题：(A)稀溶液中的混合胶束；(B)由混合胶束组成的溶致液晶；(C)具有多个缔合部分的两亲性物质中的胶凝和混合胶束作用。取得的主要结果如下。对于(A)，(1)当将那些本身形成球形胶束的胶束加入到串状胶束中时，随着所添加的表面活性剂的组成的增加，胶束在一定的组成处转变为球形。(2)这种形状变化与…有关更重要的是客体分子在胶束末端的局域化，这被基于自洽场(SCF)计算的计算模拟所证实。对于(B)，(3)通过力学测量，我们可以清楚地观察到各向同性到液晶的相变，这是一个溶胶-凝胶相变。(4)在稀溶液中加入易于形成球形胶束的客体表面活性剂时，六方液晶相相对稳定。(5)相反，加入客体表面活性剂后，立方相易变得不稳定。(6)计算了液晶相中的堆积密度和缔合数随组成的变化关系，并用超临界流体的计算结果进行了讨论。(7)在(A)和(B)两种情况下，我们发现不同化学结构的核心之间具有良好的配伍性。至于(C)、(8)，我们观察到双嵌段型和三嵌段型表面活性剂在这两个组分上形成桥砂环的相互作用。较少

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