Synthese und Charakterisierung von Polymerbürsten-Oberflächen mit Gradienten und Strukturierung (Synthesis and characterization of patterned and gradient polymer brush surfaces)

The thesis is devoted to the development of general methods of preparation of tethered polymer layers with laterally changing properties and investigation of their properties with focus on controlled adsorption and liquid flow. The temperature dependent character of the grafting reaction is used for the design of mono- and bicomponent gradient polymer grafted layers. For this purpose, a special stage providing a lateral temperature gradient is designed. The stage consists of two elements, one heating and one cooling, between which the experimental sample is situated. The versatility of these approaches for both fundamental research and practical applications is demonstrated. In general, the gradient approach is proved to be useful for the combinatorial-like investigations of ultrathin polymer films. The systematic study allowed detailed investigation of the grafting kinetics, the morphologies of the grafted polymer layers, the switching mechanism of the mixed polymer brushes, adsorption of colloid particles. The second approach for the preparation of laterally resolved tethered layers consists of a novel strategy for reversible environment-responsive lithography. This strategy implies local fixation of the morphology of mixed polymer brushes via photocrosslinking by UV irradiation. Irradiated areas lose the ability to switch. Exposure to selective and non-selective solvent allows visualization or erasing of the written information, respectively. It is demonstrated that developed approaches are promising for design of smart sensors, microfluidics devices, combinatorial study of the adsorption (separation and identification) of protein molecules and colloids and for other applications.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Technische Universität Dresden

Year

2005

Author dc:creator

• Ionov, Leonid

Contributors dc:contributor

• Stamm, Manfred
• Wolff, T.
• Stamm, M.
• Kremer, F.

• Polymer
• modification
• surface