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.

该研究项目致力于研究薄膜几何结构中 ABCBA 型多嵌段聚合物形成的形态。在此，将研究一种五嵌段三元共聚物，其特征是疏水性聚（甲基丙烯酸甲酯）（PMMA）末端嵌段A以及聚（2-（二甲基氨基）乙基甲基丙烯酸酯）（PDMAEMA）和聚（2-乙烯基吡啶）（P2VP）中间嵌段B和C。 PDMAEMA 和 P2VP 嵌段的电荷状态可以通过用于制备薄膜的溶液的 pH 值来控制，并且对薄膜中的结构有很大的影响。该项目的目的是使用选择性溶剂（水、甲醇）的循环蒸气处理来安装多种形态，这是块之间相互作用和纳米域桥接之间相互作用的结果。该膜是通过旋涂具有不同pH值的水溶液来制备的。通过吸收溶剂，末端嵌段的流动性以及中间嵌段的柔性将被改变，这可能导致平衡状态并使得不同嵌段能够混合。还将使用光学显微镜、原子力显微镜和掠入射小角 X 射线散射 (GISAXS) 对薄膜形态进行原位研究。 GISAXS 数据的建模不仅将利用薄膜内部的结构，还将利用表面形貌的贡献。所选样品将在溶剂蒸气处理过程中使用掠入射共振软 X 射线散射进行研究，以区分化学上不同的纳米域。为了阐明五嵌段三元共聚物中电荷顺序分布的作用，将对参考样品 PMMA-b-PDMAEMA-b-PMMA 进行单次测量。复杂聚合物、用于结构研究和定量建模的先进原位方法的独特组合将为带电嵌段多嵌段聚合物的行为以及结构化薄膜的可能性提供全面的见解。