多金属氧簇调控的嵌段共聚物自组装研究

发布时间：2018-05-15 16:29

本文选题：嵌段共聚物 + 多金属氧簇　；参考：《吉林大学》2017年博士论文

【摘要】：嵌段共聚物的微观相分离特性使其可以通过自组装构筑多种纳米尺度的结构。当以嵌段共聚物作为模板组装纳米级添加物构筑结构可控的复合材料时,不仅可以获得丰富的复合结构,而且赋予了复合材料在催化、光、电、磁和生物材料等方面的应用。因此,通过纳米添加物调控嵌段共聚物自组装行为及相分离结构的策略为制备基于嵌段共聚物的功能复合材料提供了新思路。本论文中,我们通过非共价作用将多金属氧簇这种无机大离子作为纳米添加物引入到嵌段共聚物基体中,来调控嵌段共聚物在溶液相和本体相的自组装结构及其性质。本论文将展示三部分关于多金属氧簇/嵌段共聚物复合物的研究工作。其中,第一部分为复合物的溶液组装结构研究,得到尺寸均一且结构稳定的球形胶束,并发现了胶束核融合的现象,与后面本体相构筑双连续结构的溶液机理相似。第二部分和第三部分分别为复合物的本体相膜组装结构研究,发现多金属氧簇通过静电力调控复合物结构可以分别从六方柱状结构和层状结构转变成双连续结构。第二部分还研究了多金属氧簇的引入对嵌段共聚物的热力学性质及粘弹性的影响。第三部分还研究了多金属氧簇/嵌段共聚物复合膜的质子传导及机械性能。以上工作为双连续结构的制备提供了简便且有效的方法。多金属氧簇调控嵌段共聚物自组装结构的研究不仅为理解复合高分子体系的自组装行为提供了新的认识,而且为构筑功能性复合高分子材料提供了新思路。
[Abstract]:The microphase separation properties of block copolymers make it possible to construct various nanoscale structures by self-assembly. When block copolymers are used as templates to construct nanocomposites with controllable structure, not only rich composite structures can be obtained, but also composite materials can be used in catalysis, light, electricity, magnetism and biomaterials. Therefore, the strategy of adjusting the self-assembly behavior and phase separation structure of block copolymers by nano-additives provides a new idea for the preparation of functional composites based on block copolymers. In this thesis, polyoxometallic clusters, a large inorganic ion, are introduced into the block copolymer matrix by non-covalent interaction to regulate the self-assembly structure and properties of the block copolymers in solution and bulk phases. This thesis will show three parts of research work on polyoxometallic cluster / block copolymer complex. In the first part, the spherical micelles with uniform size and stable structure are obtained, and the phenomenon of micellar nuclear fusion is found, which is similar to the solution mechanism of constructing double-continuous structure in the latter bulk phase. The second part and the third part are the bulk phase structure of the composite. It is found that polyoxometallic clusters can change from hexagonal columnar structure and layered structure to double continuous structure by electrostatic control. In the second part, the influence of the introduction of polyoxometalates on the thermodynamic properties and viscoelasticity of block copolymers is studied. In the third part, the proton conduction and mechanical properties of polyoxometalate / block copolymer composite membrane were studied. The above work provides a simple and effective method for the preparation of double continuous structure. The study of polyoxometallic clusters regulating the self-assembly structure of block copolymers not only provides a new understanding of the self-assembly behavior of composite polymer systems, but also provides a new idea for the construction of functional composite polymer materials.
【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：O631.1

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