Thermodiffusion of ternary polymer solutions

三元聚合物溶液的热扩散

• 批准号: 394697534
• 负责人: Professor Dr. Werner Köhler
• 金额: --
• 依托单位: The Wolfson Department of Chemical Engineering
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/394697534?language=en
• 关键词: Thermodiffusion; ternary; polymer; solutions

Ternary mixtures are prototypic for truly multicomponent systems, since they show characteristic cross coupling phenomena that are still absent in binary mixtures. We want to investigate thermodiffusion in ternary mixtures containing at least one polymeric component. By studying a polymer in a mixed solvent we want to investigate the coupling and decoupling of the solvent-solvent and the polymer-solvent dynamics. By increasing the molar mass of the polymer we will be able to study the transition from a commensurate ternary mixture, composed of similar-sized molecules, to an incommensurate system with a pronounced size asymmetry of the constituents. Based on the envisaged experiments, on our previous work on the thermophobicity concept, and on results for binary polymer solutions and blends, we will extend the thermophobicity model to ternary mixtures and investigate the feasibility of an effective solvent approach for a polymer in a mixed solvent. We will also establish polymers in mixed solvents as fully characterizable model systems for ternary liquids. Contrary to mixtures of small molecules, a clear separation of the eigenvalues of the diffusion matrix can be expected, which will allow for a unique determination of all six independent diffusive transport coefficients of a non-isothermal ternary mixture. The experimental work will be complemented on the theoretical side by an intense collaboration with K. Morozov (Technion Haifa), who will extend his existing model for hard spheres to flexible chain molecules and ternary mixtures using the PC-SAFT equation of state and data from the experimental part of the project.

三元混合物是真正的多组分体系的原型，因为它们表现出在二元混合物中仍然不存在的特征交叉耦合现象。我们想要研究至少含有一种聚合物组分的三元混合物中的热扩散。通过研究混合溶剂中的聚合物，我们想要研究溶剂-溶剂的耦合和解耦以及聚合物-溶剂的动力学。通过增加聚合物的摩尔质量，我们将能够研究从由大小相似的分子组成的公度三元混合物到成分大小明显不对称的无公度体系的转变。基于设想的实验，基于我们先前关于憎热概念的工作，以及对二元聚合物溶液和混合物的结果，我们将把憎热模型扩展到三元混合物，并研究在混合溶剂中对聚合物进行有效溶剂处理的可行性。我们还将建立混合溶剂中的聚合物作为三元液体的完全可表征的模型系统。与小分子混合物相反，可以预期扩散矩阵的特征值被清楚地分离，这将允许唯一地确定非等温三元混合物的全部六个独立的扩散输运系数。这项实验工作将通过与K·莫洛佐夫(Technion Haifa)的密切合作在理论方面得到补充，莫罗佐夫将使用PC-SAFT状态方程和该项目实验部分的数据将他现有的硬球模型扩展到柔性链分子和三元混合物。