Structure and Dynamics of Network Janctions in Thermoreversible Gels of Associating Polymers

缔合聚合物热可逆凝胶中网络连接的结构和动力学

• 批准号: 09650987
• 负责人: TANAKA Fumihiko
• 金额: $ 2.24万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650987/
• 关键词: Associating Polymers; Thermoreversible Gels; Multiplicity of Cross-links; Hydrophobic Aggregation; Intramolecular Micelle; Helix-Coil Transition; Network Structure; Monte Carlo Simulation; ヘリックス・コイル転移; モンテカルロシミュレーション; フラワーミセル; 混合ゲル; 架橋寿命; 架橋点

This project studied thremoreversible gelation of associating polymers with multiple cross-link junctions. We paid special attention to (1) the multiplicity and sequence length of the network junctions, (2) motion of network junctions and the number of elastically effective chains, (3) competition between intermolecular micellization and intermolecular cross-linking, (4) effect of added surfactants, (5) cooperative effect of conformational change of polymers and gelation, (6) formation of mixed networks. We derived complete phase diagrams including phase separation, gelation, micellization, microphase separation etc. The conventional Eldridge-Ferry method is extended to evaluate multiplicity, as well as enthalpy, of the cross-links, and applied to the experimental gel melting curves of poly (vinyl alcohol) in water. The effect of added surfactants on the formation of reversible gels in hydrophobically modified polymer solutions is also studied under the assumption of the existence of a minimum multiplicity required for stable cross-links. For telechelic associating polymers, we found the condition for appearance of flower micelles (micelles formed only by loops) before the gel point.

本课题研究了具有多重交联点的缔合聚合物的热可逆凝胶化。我们特别注意了（1）网络连接的多重性和序列长度，（2）网络连接的运动和弹性有效链的数目，（3）分子间胶束化和分子间交联的竞争，（4）添加表面活性剂的影响，（5）聚合物构象变化和凝胶化的协同作用，（6）混合网络的形成。我们推导出完整的相图，包括相分离，凝胶化，胶束化，微相分离等传统的Eldridge-Ferry方法扩展到评估的多重性，以及焓，交联，并施加到聚（乙烯醇）在水中的实验凝胶熔融曲线。添加表面活性剂的疏水改性的聚合物溶液中的可逆凝胶的形成的效果也研究了稳定的交联所需的最小多重性的存在下的假设。对于遥爪缔合聚合物，我们发现的条件下出现的花胶束（胶束形成的循环）之前的凝胶点。

项目成果

F.Tanaka: "Intramolecular and Intermolecular Association in Thermoreversible Gelation of Hydrophobically Modified Associating Polymers" Computational and Theoretical Polymer Science. 特集号. (1999)

F. Tanaka：“疏水改性缔合聚合物热可逆凝胶化中的分子内和分子间缔合”计算和理论聚合物科学特刊（1999 年）。

F.Tanaka: "Phase Formation and Dynamics of Associating Polymers" Prog.Colloid Polym.Sci.106. 158-166 (1997)

F.Tanaka：“缔合聚合物的相形成和动力学”Prog.Colloid Polym.Sci.106。

F.Tanaka: "Intramolecular and Intermolecular Association in Thermoreversible Gelation of Hydrophobically Modified Associating Polymers"Computational and Theoretical Polymer Science. 特集号. (2000)

F. Tanaka：“疏水改性缔合聚合物热可逆凝胶化中的分子内和分子间缔合”计算和理论聚合物科学特刊（2000 年）。

F. Tanaka: "Thermoreversible Gelation Strongly Coupled to Polymer Conformational Transition"Macromolecules. (to appear) May. (2000)

F. Tanaka：“热可逆凝胶化与聚合物构象转变强耦合”大分子。

F.Tanaka: "Structure and Dynamics of Transient Gels" Prog.Theor.Phys.Supplement. 126. 257-260 (1997)

F.Tanaka：“瞬态凝胶的结构和动力学”Prog.Theor.Phys.Suplement。