Statistical-Mechanical Study of Phase Formation in Thermoreversible Gels

热可逆凝胶相形成的统计力学研究

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640450/
• 关键词: thermoreversible gel; association; sol; gel transition; aqueous polymer solution; interpenetrating polymer network; tricritical point; microphase separation; hydration of polymers; 熱可逆性ゲル; ゾル・ゲル転移; 相図; 架橋; 水和; 再帰的相分離

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.

我们开发了一种新理论（“缔合聚合物溶液理论”）来导出热可逆凝胶的相图。该理论是Flory和Huggins发展的晶格理论聚合物溶液理论和Flory和Stockmayr建立的经典凝胶理论（树统计）的结合。它描述了聚合物之间的化学平衡。(1)通过这一新理论，我们推导出了复杂流体的相图，包括均聚物凝胶、水合凝胶、互穿凝胶、伴随聚合物构象变化的凝胶等，并显示了新的多临界现象的出现溶胶/凝胶转变、微相分离和宏观相分离之间的竞争。（2）基于这些结果，我们现在正在工作站上开发计算机系统，用于从分子预测复杂相图组成聚合物的设计。该系统将作为一个模拟系统来帮助材料的开发。(3)我们还发展了热可逆凝胶的粘弹性理论。这被称为“瞬态网络理论”，并为研究例如生物细胞通过重复溶胶/凝胶转变和称为“增稠剂”的粘度控制聚合物的运动提供了良好的起点。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。

项目成果

田中文彦: "高分子の物理学" 裳華房, 170 (1994)

田中文彦：《高分子物理学》Shokabo，170 (1994)

F.Tanaka and W.H.Stackmayr: "Thermoreversible Gelation with Junctions of Variable Multiplicity" Macromolecules. 27. 3943-54 (1994)

F.Tanaka 和 W.H.Stackmayr：“具有可变多重性连接的热可逆凝胶化”大分子。

F.Tanaka & M.Ishida: "Phase Formation of Two-Component Physical Gels" Physica A. 3月号. (1994)

F.Tanaka 和 M.Ishida：“双组分物理凝胶的相形成”Physica A. 三月号（1994 年）。

田中文彦: "熱可逆性ゲル" 日本物理学会誌. 48. 546-549 (1993)

Fumihiko Tanaka：“热可逆凝胶”日本物理学会杂志 48. 546-549 (1993)。

Tanaka.F.and Ishida.M.: "Phase Formation of Two-Component physical Gels" Physica. A204. 660-672 (1994)

Tanaka.F. 和 Ishida.M.：“双组分物理凝胶的相形成”Physica。