Kontrolle des Benetzungsverhaltens von Polymeren auf oberflächenverankerten Polymermonolagen

在提交的提案中描述的项目中，我们希望研究具有定制表面涂层的聚合物与基材接触时的润湿特性。底物的化学组成和结构将通过共价附着在底物表面的聚合物单层来控制。表面附着的聚合物层可以通过使用自组装的单层引发剂和在表面原位生长的聚合物链（“接枝从”）或通过光化学“对接”程序生成，其中预成型的聚合物与底物共价连接（“接枝到”）。从结构的角度来看，我们将要研究的一个类似的体系，是基于聚合物通过沿着主链随机分布的几个点的化学反应而形成的附着，这将导致沿链具有几个锚点的链构象。根据接枝密度和与衬底表面相互作用的强度和性质，可以得到表面附着的聚合物链的“煎饼”、线圈或“刷”状构象。除了单层超薄外，表面附着网络也将被研究。链的构象预计对体系的润湿性能有很大的影响。对于所有的系统，它将被研究，如何链的拓扑结构的表面附着链影响系统的润湿性能。通过系统地改变聚合物分子的层组成和分子量以及系链的锚定密度，我们希望开发出能够高精度控制固体基质润湿行为的方案。

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.