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SYPF: Struktur und Dynamik in dünnen Polymerfilmen

SYPF 1: Structure and Dynamics in Thin Polymer Films

SYPF 1.4: Hauptvortrag

Donnerstag, 14. März 2002, 10:10–10:40, H37

Formation and properties of multifunctional surfaces prepared via ’forced assembly’ of oligomers and polymers — •J. Genzer — Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA

In my presentation I will discuss several novel methodologies of tuning surface properties through controlling the grafting density of anchored molecules or macromolecules. I will show that the packing of oligomers can be successfully tailored by mechanically manipulating the molecules’ attachment points at an elastomeric - a process that produces No-dqmechanically assembled monolayersNo-dq (MAMs) [Science 290, 2130 (2000)]. I will also demonstrate how the MAM technology can be extended to produce polymer brushes with variable grafting densities using MAPA (=No-dqmechanically assisted polymer assemblyNo-dq) by performing the polymerization directly on the pre-stretched elastomer substrate [Macromolecules 34, 684 (2001)]. Finally, I will talk about preparing molecular and macromolecular gradients with tailorable surface properties. Specifically, I will document that very good control over the chemistry, gradient steepness, and gradient position on the substrate can be achieved [Advanced Materials 13, 1560 (2001)] that allows for: i) preparation of substrates covered with gradient polymer brushes (No-dqmushroomNo-dq to No-dqbushNo-dq), and ii) adjusting spatial distribution of non-polymeric object (such as nanoparticles) deposited onto such molecular gradient substrates.