Entnetzungsphänomene und Stabilität von dünnen Filmen aus Polymeren mit perfluorierten Substituenten

本项目旨在研究含氟侧链聚合物薄膜的稳定性和结构。这对于纺织品和聚合物的防油、防水、防土壤涂层以及涂层技术本身都具有实际意义。我们最近的研究表明，半氟化聚合物经历了逐层的自憎性去湿。这种现象是由主链的熵有利的卷曲和侧链的能量有利的有序化之间的相互作用控制的。膜的稳定性和去湿过程的动力学将根据聚合物的结构、膜的厚度和与基材的相互作用进行系统的研究。据此，将制备一系列具有可结晶的全氟烷基侧链和本质无序的全氟低聚醚侧链的线型聚合物。除了目前的研究之外，还将开发一种新的聚合物薄膜微图案化技术，该技术基于半氟化聚合物溶液表面水冷凝图案的玻璃化。该方法允许制备周期在100到10000 nm之间的六角形图案。

This project is directed towards stability and structure of thin films of polymers with perflorinated side chains. This is of practical importance for oil-, water and soil repellent coatings for textiles and polymers as well as for the coating technology itself. Our recent study has shown that semifluorinated polymers undergo layer-by-layer autophobic dewetting. This phenomenon is controlled by interplay between entropically favorable coiling of the backbone and energetically favored ordering of the side chains. Film stability and kinetics of the dewetting process will be studied systematically in dependence of the polymer structure, film thickness and interaction with the substrate. Hereby, a series of linear polymers with cristallizable perfloroalkyl side chains and intrinsically disordered perfluoroligoether side chains will be prepared. In addition to the current research, a new technique for micropatterning of thin polymer films will be developed based on vitrification of the water condensation pattern on a surface of a semifluorinated polymer solution. This approach allows preparation of a hexagonal pattern with a periodicity ranging from 100 to 10000 nm.