Tunable morphologies in charged multiblock polymers in thin film geometry

薄膜几何结构中带电多嵌段聚合物的可调谐形态

• 批准号: 493000819
• 负责人: Professorin Dr. Christine M. Papadakis
• 金额: --
• 依托单位: Arbeitsgruppe Physik der weichen Materie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/493000819?language=en
• 关键词: Tunable; morphologies; charged; multiblock; polymers

The research project addresses the morphologies formed by multiblock polymers of the type ABCBA in thin film geometry. At this, a pentablock terpolymer featuring hydrophobic poly(methyl methacrylate) (PMMA) end blocks A together with poly(2-(dimethylamino)ethyl methacrylat) (PDMAEMA) and poly(2-vinylpyridine) (P2VP) middle blocks B and C will be investigated. The charge state of the PDMAEMA and P2VP blocks can be controlled by the pH value of the solution used for preparation of the films and has a strong influence on the structures in the film. Aim of the project is to use cyclic vapor treatment with selective solvents (water, methanol) to install a multitude of morphologies, which are a result of the interplay between the interactions between the blocks and the bridging of the nanodomains. The films are prepared by spin-coating from aqueous solution having different pH values. By taking up solvent, the mobility of the end blocks as well as the flexibility of the middle blocks will be altered, which possibly results in equilibrium states and enables the mixing of different blocks. The film morphologies will be investigated, also in situ, using optical microscopy, atomic force microscopy and grazing-incidence small-angle X-ray scattering (GISAXS). Modeling of the GISAXS data will be carried out using not only structures inside the film, but also contributions from the surface topography. Selected sample will be investigated using grazing-incidence resonant soft X-ray scattering, also during solvent vapor treatment, to discriminate the chemically different nanodomains. To elucidate the role of the sequential distribution of charges in the pentablock terpolymer, single measurements will be carried out on a reference sample PMMA-b-PDMAEMA-b-PMMA. The unique combination of a complex polymer, advanced in-situ methods for structural investigations and quantitative modeling will provide comprehensive insight into the behavior of multiblock polymers with charged blocks and the possibilities for structuring thin films.

该研究项目探讨了薄膜几何形状中ABCBA类型的多嵌段聚合物形成的形态。在此，将调查戊烷基聚合物（PMMA甲基丙烯酸甲酯）（PMMA）末端与聚（2-（dimethylamino）乙基甲基丙烯酰胺）（PDMAEMA）（PDMAEMA）和聚（2-乙烯基吡啶）（P2VP）（P2VP）中间B和C的末端。 PDMAEMA和P2VP块的电荷状态可以由用于制备膜的溶液的pH值控制，并且对膜中的结构有很大影响。该项目的目的是使用选择性溶剂（水，甲醇）的环状蒸气处理来安装多种形态，这是块与纳米域之间的相互作用之间相互作用的结果。膜是通过从具有不同pH值的水溶液中旋涂来制备的。通过占用溶剂，将改变末端块的迁移率以及中间块的柔韧性，这可能会导致平衡状态并实现不同块的混合。还将使用光学显微镜，原子力显微镜和放牧的小角X射线散射（GISAXS）研究膜形态。 GISAXS数据的建模将不仅使用胶片内部的结构进行，还可以使用表面形貌进行贡献。在溶剂蒸气处理过程中，将研究选定的样品使用放牧含量的谐振软X射线散射，以区分化学上不同的纳米域。为了阐明电荷在五角杆terpolymer中的顺序分布的作用，将在参考样品PMMA-B-PDMAEMA-B-PMMA上进行单个测量值。用于结构研究和定量建模的复杂聚合物，先进的原位方法的独特组合将为具有带电块的多块聚合物的行为以及构造薄膜的可能性提供全面的见解。