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Statistical-Mechanical Study of Phase Formation in Thermoreversible Gels

热可逆凝胶相形成的统计力学研究

基本信息

批准号：
05640450
负责人：
TANAKA Fumihiko
金额：
$ 1.47万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

We developed a new theory ("Solution Theory of Associating Polymers") to derive phase diagrams of thermoreversible gels. This theory is a combination of the lattice-theoretical polymer solution theory developed by Flory and Huggins, and the classical theory of gelation (tree statistics) established by Flory and Stockmayr. It describes chemical equilibrium among polymers.(1) By this new theory, we derived phase diagrams of complex fluids including homopolymer gels, hydrated gels, interpenetrating gels, gels accompanied by polymer comformation change, etc. We showed new multicritical phenomena appear as a result of the competion among sol/gel transition, microphase separation and macrophase separation.(2) On the basis of these results, we are now developing on a work station a computer system for the prediction of complex phase diagrams from molecular design of constituent polymers. This system will serve as a simulation system to help material developments.(3) We also developed a theory of visco-elasticity of thermoreversible gels. This is called "Transient Network Theory", and provides a good starting point to study, for examle, movement of biiological cells by repeated sol/gel transition and viscosity-controlling polymers called "thickner". Some reserch groups in Eulope and U.S.A.are producing experimental data to compare with our theory.

我们发展了一种新的理论（“缔合聚合物的溶液理论”）来推导热可逆凝胶的相图。该理论结合了Flory和Huggins提出的晶格理论聚合物溶液理论，以及Flory和Stockmayr建立的经典凝胶理论（树统计）。它描述了聚合物之间的化学平衡。(1)利用这一新理论推导了均聚凝胶、水合凝胶、互穿凝胶、聚合物构象变化凝胶等复杂流体的相图。在溶胶/凝胶过渡、微相分离和大相分离的竞争下，出现了新的多临界现象。(2)在这些结果的基础上，我们现在正在一个工作站上开发一个计算机系统，用于从组成聚合物的分子设计中预测复杂相图。该系统将作为一个模拟系统来帮助材料开发。(3)我们还建立了热可逆凝胶的粘弹性理论。这被称为“瞬态网络理论”，并为研究生物细胞的运动提供了一个很好的起点，例如，通过重复的溶胶/凝胶过渡和被称为“增稠剂”的粘度控制聚合物。欧洲和美国的一些研究小组正在制作实验数据来与我们的理论进行比较。