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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster Session III
CPP 50.47: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1C
Minority Chains with Wall-Adsorbing End Groups Admixed to Polymer Brushes — •Markus Koch1, Dirk Romeis1, and Jens-Uwe Sommer1,2 — 1Institute Theory of Polymers, IPF Dresden, Germany — 2Institute Theory of Physics, TU Dresden, Germany
Polymer brushes are one of the most promising systems for the creation of surfaces with stimulus-responsive properties. It is highly desirable for applications to expose or hide specific chemical groups within the brush depending on changing system conditions. To this end, we investigate monodisperse polymer brushes, to which a small fraction of end-modified minority chains is admixed. The minority chains can be of a different length as compared to the brush chains and their terminal groups adsorb to the grafting surface at sufficient attraction energies. We study these systems combining Scheutjens-Fleer self-consistent field calculations [1], MD simulations and analytical theory. Firstly, the conformational changes of the admixed chains are explored, which depend on minority chain lengths as well as the attractivity between their end groups and the grafting wall. Furthermore, we analyze the free energy profiles of the end-group adsorption, from which transition energies are obtained. Lastly, we demonstrate that the adsorption barriers are predicted reasonably well by our theoretical approach and that they are strongly reduced under poor solvent conditions.
[1] Fleer, G. J., Cohen Stuart, M. A., Scheutjens, J. M., Cosgrove, T., Vincent, B., Polymers at Interfaces. London, Chapman and Hall, 1993.