Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Chemische Physik und Polymerphysik
CPP 29: POSTER: Polymer physics
CPP 29.23: Poster
Dienstag, 8. März 2005, 16:30–18:30, Poster TU D
Polymer adhesion at surfaces — •Alexander Schmatulla1, Igor Potemkin2, Alexei Khokhlov2, and Othmar Marti1 — 1Abt. Experimentelle Physik Albert-Einstein-Allee 11 89081 Ulm — 2Abt. Polymer Physik Albert-Einstein-Allee 11 89081 Ulm
Several methods, like force spectroscopy or optical tweezers, have been developed to analyse the mechanical properties of single polymer chains, like DNA, PE, PMMA. In the case of graft copolymers with long side chains, parameters like the length, orientation with respect to the backbone and density can influence the micro structure and the mechanical properties of the entire macromolecule. For such polymers, the properties of the side chains are interesting, too. However, the mechanical properties of the single side chain of graft polymers are still unknown. First aims of this project are to prepare brushed copolymers on different surfaces and to detect the backbone and the side chains in tapping mode. The next step will be to measure the mechanical behavior of the side chains: a suitable measurement apparatus to determine these properties is our custom-built differential AFM. Also using the Digital Pulsed Force Mode allows to detect the forces necessary to pull-off the side chains from the surfaces by digitalizing the complete trajectory of the tip and successively converting the acquired data into an array of force vs. distance curves.