Compatibility and dynamics of mixed micelles of polymer associates

本课题旨在研究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”，研究混合胶束的形成和排列。我们主要研究了各种疏水改性聚乙二醇的水溶液，并采用了光散射、x射线散射和粘弹性等方法。研究结果的内容分为以下三个问题；(A)稀溶液中的混合胶束，(B)由混合胶束组成的溶性液晶，(C)具有多个结合基团的两亲性物质中的凝胶化和混合胶束化。得到的主要结果如下。(A)、(1)在弦型胶束中加入自行形成球形胶束的胶束后，随着加入的表面活性剂组成的增加，胶束在一定的组成下会转变为球形。(2)基于自洽场（SCF）计算的计算模拟证实了这种形状变化更多地与胶束末端客体分子的定位有关。对于(B)、(3)，我们可以通过力学测量清楚地观察到各向同性到液晶的相变是一种溶胶-凝胶相变。(4)六方液晶相对于客体表面活性剂的掺入是相对稳定的，客体表面活性剂在稀溶液中易于形成球形胶束。(5)相反，由于客体表面活性剂的加入，立方相很容易变得不稳定。(6)利用SCF计算结果，评价了液相中的堆积密度和缔合数作为组分的函数，并进行了讨论。(7)在(A)和(B)两种情况下，我们发现不同化学结构的岩心之间具有良好的相容性。对于(C)、(8)，我们观察到二块型和三块型表面活性剂之间的共同作用，在两种组分上形成桥状砂环。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