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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Nanoparticles and Composite Materials I

CPP 1.11: Vortrag

Montag, 11. März 2013, 12:45–13:00, H34

Conformational Transitions in Polymer Brushes — •Dirk Romeis1,2 and Jens-Uwe Sommer1,21Leibnitz-Institut für Polymerforschung Dresden, Germany — 2Technische Universität Dresden, Germany

Due the large density gradients in polymer brushes strong interaction forces are present leading to stretched chain conformations with the end-to-end distance scaling linearly with the degree of polymerization. In such an environment slight modifications of individual brush chains have great effects on their conformations [1,2]. We developed a quasi off-lattice SCF Model, that accounts for finite extensible polymer chains composed of differently sized and interacting spherical monomers. It allows for a realistic description of polymer brushes up to high grafting densities and the results are in excellent agreement to corresponding MD simulation [3], including packing, fluctuation and depletion effects. Using this approach we analyzed the behavior of individually modified guest chains in polymer brushes and encountered conformational transitions revealing a scaling behavior that can be rationalized using an analytical model.   [1] Merlitz H. et. al. [Macromolecules 41 5070, 2008]   [2] Merlitz H. et. al. [PRL 102 115702, 2009]   [3] Romeis D. et. al. [JCP 136 044903, 2012]

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DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg