Dresden 2009 – wissenschaftliches Programm

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SYSO: Symposium Self-organizing Surfaces and Interfaces

SYSO 3: Self-Organizing Surfaces and Interfaces - Posters

SYSO 3.2: Poster

Mittwoch, 25. März 2009, 17:30–19:30, P3

Chemical reactivity at surfaces induced by self organisation in ultrathin PEO films — •Evelyn Meyer and Braun Hans-Georg — Leibniz Institute of Polymer Research Dresden - Max Bergmann Center of Biomaterials, Dresden, Germany

The self organisation process that will be addressed is related to the crystallisation of Polyethyleneoxide (PEO) from amorphous ultrathin (3nm) PEO films. During crystallisation dendritic shaped lamellae crystals of PEO develope. Using appropriate short chain molecules (molecular weights in between 2000 and 6000) unfolded, or just 2 to 3 times folded lamella appear. During this process the surface chemistry of the material changes while the hidden endgroups of the amorphous state become enriched at the new created lamella surfaces. Using electron beam lithography we could attach the water soluble PEO lamellae to the surface. Using aminoendendgroups and fluorescence labelling we could demonstrate the strong increase in these endgroups as a consequence of the crystallisation process.