Theoretische und experimentelle Untersuchungen von Benetzungseigenschaften von dünnen ein- und zweikomponentigen Polymerfilmen

聚合物薄膜的稳定化在物理、化学、医学、生物和材料科学等领域具有重要的实际意义。利用旋涂技术，可以在多种不同的固体衬底上制备聚合物薄膜，包括薄膜不稳定的非湿润表面。在玻璃化转变温度以上的退火过程中，不同的工艺会导致薄膜的不稳定。这些影响在已经运行的项目中对模型系统进行了研究。然而，真实的系统是显著不同的，例如由于衬底粗糙度和化学不均匀性的影响。对这些影响的系统研究在很大程度上仍然缺乏。除了衬底参数的影响外，使用过的聚合物分子的化学性质也是重要的。例如，嵌段共聚物可以用于膜稳定，但也很有趣，因为它们本身形成了有序结构。到目前为止，嵌段共聚物在固体基片上的脱湿还很少被研究。在这个项目中，我们建议研究基片性质(粗糙度和化学非均质性)以及孔状聚合物性质对薄膜稳定性的影响。以除湿时间尺度作为衡量膜稳定性的指标。通过散射技术，我们获得了大样本区域的信息，这是去湿过程的特征。通过使用局部成像技术，可以在不同的长度尺度上获得稳定性和去湿的不同方面的图像。

Stabilisation of thin polymer films is of great practical importance for many applications in physics, chemistry, medicine, biology and material science. Utilising the spin-coating technique thin polymer films can be prepared on a large variety of different solid substrates including also non-wetting surfaces, where films are not stable. Different processes can contribute to film destabilisation during annealing above the glass transition temperature. Those effects are studied in the already running project on model systems. Real systems are, however, significantly different for instance due to the influence of substrate roughness and chemical inhomogeneity. A systematic study of those effects is still largely missing. Besides the influence of substrate parameters also the chemical nature of used polymer molecules is of importance. For instance block copolymers can be used for film stabilisation, but are also interesting because of the formation of ordered structures on themselves. The dewetting of block copolymers on solid substrates has hardly been studied up to now.In this project it is proposed to investigate the influence of substrate properties (roughness and chemical heterogeneity), which will be modified in a well defined way, as well as porticular plymer properties on the stabilisation of the film. The time scale of dewetting is taken as a measure of film stability. With scattering techniques we obtain information on a large sample area, which is characteristic for the dewetting process. By the use of local imaging techniques a picture of different aspects of stability and dewetting is obtained on different length scales.