Inter- and intramolecular nanomechanical interactions of homo- and heterogenous polymers

均质和异质聚合物的分子间和分子内纳米机械相互作用

• 批准号: 467382377
• 负责人: Privatdozent Dr. Christian Dietz
• 金额: --
• 依托单位: Fachgebiet Physics of Surfaces
• 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/467382377?language=en
• 关键词: Inter; intramolecular; nanomechanical; interactions; homo

The macroscopic mechanical properties of a variety materials, in particular that of polymers, are determined by their nanomechanical heterogeneity based on the polymer configuration and conformation, chain length and interactions among them. The individual contributions to the nanomechanical properties of a relevant polymer system as model is to be studied in detail in this project. To this end, a multifrequency atomic force microscopy method will be developed that can capture quantitatively the nanomechanical properties at the surface and directly beneath in three spatial directions. Using the first eigenmode of the flexural cantilever vibration the indentation depth of the tip into the sample surface can be controlled while the topography is tracked in the amplitude modulation mode. Through the additional excitation and frequency modulated detection of the second flexural and the first torsional eigenmodes, the conservative and dissipative portions of the tip-sample interaction in two spatial directions can be analyzed. The influence of the chain length and film thickness of thin polystyrene and polybutadiene samples on the nanomechanical properties and thus, on the intermolecular interactions is to be investigated. The comparison of these properties with that of cross-linked and diblock/triblock (co-)polymers of the same components provides valuable information about the intramolecular interactions on the nanoscale. Additionally, the stepwise erosion of the sample surface and the subsequent volume reconstruction of the triblock samples by nanotomography allows for unravelling the structure-property relationship with respect to the nanomechanical properties. Implications of UV radiation on the polymers will be studied by Raman spectroscopy and nanomechanical analysis. Thereby, a relationship between the chemical transformation and mechanical alteration of the block copolymers can be established.

各种材料，特别是聚合物的宏观力学性能，是由它们的纳米力学异质性基于聚合物的构型和构象，链长和它们之间的相互作用决定的。在本项目中，将详细研究作为模型的相关聚合物系统对纳米力学性能的单独贡献。为此，将开发一种多频原子力显微镜方法，该方法可以在三个空间方向上定量捕获表面和直接下方的纳米力学性质。利用弯曲悬臂梁振动的第一本征模，可以控制针尖进入样品表面的压痕深度，同时在振幅调制模式下跟踪形貌。通过对第二弯曲和第一扭转本征模的附加激励和频率调制检测，可以分析两个空间方向上针尖-样品相互作用的保守和耗散部分。薄聚苯乙烯和聚丁二烯样品的链长和膜厚度对纳米力学性能的影响，从而对分子间的相互作用进行了研究。这些性能的比较与交联和二嵌段/三嵌段（共）聚合物相同的组件提供了有价值的信息，在纳米尺度上的分子内相互作用。此外，逐步侵蚀的样品表面和随后的体积重建的三嵌段样品的纳米断层扫描允许解开的结构-性质的关系，相对于纳米机械性能。紫外辐射对聚合物的影响将通过拉曼光谱和纳米力学分析进行研究。由此，可以建立嵌段共聚物的化学转化和机械改变之间的关系。