Grenzschicht von wässrigen Blockcopolymerlösungen an polymerbeschichteten Substraten: Adsorbatstruktur und Benetzungsverhalten

本项目旨在阐明表面活性剂分子的有序性和自组装如何影响这些两亲分子的稀水溶液和浓水溶液对固体基质的润湿行为。特别是，我们感兴趣的是由聚苯乙烯或聚甲基丙烯酸甲酯薄膜覆盖的硅衬底的润湿特性。烷基聚氧乙烯醚表面活性剂与这些聚合物复盖基材的水溶液体系的边界层将主要用中子反射仪和原子力显微镜来研究。宏观润湿行为将通过测量固着液滴的平衡接触角来表征，它是表面活性剂浓度低于和高于临界胶束浓度的函数。预计结构敏感技术与热力学方法的结合将更好地揭示聚合物/表面活性剂体系中这些“软”界面提出的一些有趣的问题，具有重要的实际意义。

This project aims to elucidate the way in which the ordering and self-assembly of surfactant molecules affects the wetting behaviour of solid substrates by dilute and concentrated aqueous solutions of these amphiphiles. In particular, we are interested in the wetting characteristics of silicon substrates covered by thin films of polystyrene or polymethylmethacrylate. The boundary layer of aqueous systems of alkyl-polyethoxylate surfactants against these polymer covered substrates will be studied mainly by neutron reflectometry and atomic force miccroscopy. The macroscopic wetting behaviour will be characterized by measuring equilibrium contact angles of sessile drops as a function of the surfactant concentration below and above the critical micelle concentration. It is anticipated that the combination of structure sensitive techniques with thermodynamic methods will shed more light on some of the intriguing questions posed by these "soft" interfaces in polymer/surfactant systems of great practical importance.