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Formation and Dynamics of Self-Organized Structures in Complex Fluids

复杂流体中自组织结构的形成和动力学

基本信息

批准号：
12640371
负责人：
KAWAKATSU Toshihiro
金额：
$ 2.24万
依托单位：
Tohoku University (2001-2003)Nagoya University (2000)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

项目摘要

In this research, we applied the self-consistent field (SCF) theory, which is a useful tool in theoretical predictions of the spatially inhomogeneous structures in dense polymer systems, to various practical problems. We also extended the self-consistent field theory to dynamical problems.We first checked the validity of the SCF theory by applying it to various problems in dense polymer systems. We studied micellar formation in tri-block copolymer solutions, Change in the surface tension by addition of block copolymers, interactions between polymer-grafted colloidal particles, and so on. We found that changes in the polymer conformation play important roles in interactions between colloidal particles and interfacial properties.Next, we tried to extend the SCF theory to dynamical problems. The simplest way of extending the SCF theory to dynamical problems is to use an assumption of the linear diffusion, i.e. a current of the segments is induced by the gradient of the chemical potential (Ficks law). Using this dynamical SCF theory, we studied a domain formation in thin polymer blend film on a solid surface, and complex domain formations induced by a competition between micro-and macro-phase separations in block copolymer blend. We observed similar phase separation dynamics and domain structures as in realistic systems. We also checked the validity of this dynamical model by comparing it with Rouse model.In a large deformation regime where the chain conformation is considerably deformed by external forces, the above dynamical SCF theory breaks down. In order to evaluate the degree of deformation of the chain conformation, we introduced non-isotropic bond-distribution functions. This new dynamical SCF theory is verified by studying a polymer brush system under shear deformation.

在这项研究中，我们将自洽场(SCF)理论应用于各种实际问题。自洽场理论是预测稠密聚合物体系中空间非均匀结构的有用工具。我们还将自洽场理论推广到动力学问题。我们首先通过将自洽场理论应用于稠密聚合物系统中的各种问题来检验它的有效性。我们研究了三嵌段共聚物溶液中胶束的形成，嵌段共聚物的加入对表面张力的影响，聚合物接枝胶粒之间的相互作用等。我们发现聚合物构象的变化在胶体粒子与界面性质的相互作用中起着重要的作用。接下来，我们尝试将SCF理论推广到动力学问题。将SCF理论推广到动力学问题的最简单方法是使用线性扩散的假设，即由化学势的梯度(Ficks定律)诱导段的电流。利用这一动态超临界流体理论，我们研究了聚合物共混膜在固体表面的微区形成，以及嵌段共聚物共混物中微观相和宏观相竞争所引起的复杂相区的形成。我们观察到了与现实系统相似的相分离动力学和磁区结构。通过与Rouse模型的比较，验证了该动力学模型的有效性。在外力作用下链构象发生较大变形的大变形区域，上述动力学SCF理论被打破。为了评价链构象的变形程度，我们引入了各向同性键分布函数。通过对剪切变形下的聚合物刷子系统的研究，验证了这种新的动态超临界流体理论。