Kontrolle des Benetzungsverhaltens von Polymeren auf oberflächenverankerten Polymermonolagen

在提交的建议书中描述的项目中，我们希望研究聚合物与具有定制表面涂层的基材接触时的润湿特性。衬底的化学成分和结构将通过共价连接到衬底表面的聚合物单分子层来控制。表面附着的聚合物层将通过使用引发剂的自组装单分子层和聚合物链在表面的原位生长(“接枝”)或通过光化学“对接”过程产生，在该过程中预制的聚合物共价连接到衬底(“接枝到”)。从结构的角度来看，将要研究的类似体系是基于聚合物通过化学反应在沿着主链的几个随机分布的点上附着，这将导致链构象沿着链上有几个锚点。根据接枝密度和与基材表面相互作用的强度和性质，可以获得表面附着的高分子链的“煎饼”状卷曲或“刷状”构象。除了单分子膜外，还将研究超薄的表面附着网络。链的构象对体系的润湿性能有很大的影响。对于所有的体系，都将研究表面连接链的链拓扑结构如何影响体系的润湿性能。通过系统地改变聚合物分子的层组成和分子质量以及系链的锚链密度，我们希望开发出能够高精度地控制固体基质的润湿行为的方案。

In the project described in the submitted proposal we want to study the wetting properties of polymers in contact with substrates with tailor-made surface coatings. Chemical composition and structure of the substrates will be controlled through polymer monolayers covalently attached to the surfaces of substrates. The surface-attached polymer layers will be generated either by using self-assembled monolayers of initiators and growth of the polymer chains at the surface in situ ("grafting from") or through photochemical "docking" procedures, in which preformed polymers are covalently linked to the substrate ("grafting to"). A from a structural point of view similar system, which will be studied, is based on the attachment of polymers through chemical reactions at several, randomly distributed points along the backbone, which will lead to chain conformations with several anchor-points along the chain. Depending on the graft density and the strength and nature of interactions with the substrate surface "pancake" coil or "brush"-like conformations of the surface-attached polymer chains can be obtained. In addition to the monolayers ultrathin, surface-attached networks will be studied. The conformation of the chains is expected to have a very strong influence onto the wetting properties of the system.For all systems it will be studied, how the chain topology of the surface-attached chains influences the wetting properties of the system. Through systematic variation of the layer composition and the molecular weight of the polymer molecules as well as the anchor density of the tethered chains we want to develop protocols, which allow to control the wetting behavior of solid substrates with high precision.