Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Polymer Networks and Dynamics
CPP 17.8: Poster
Montag, 20. März 2017, 18:30–21:00, P1C
Influence of Structure on the Slip Boundary Condition of Polymeric Liquids: Experiments and MD-Simulations — •Mischa Klos1, Laurent Joly2, Sebastian Backes1, Sascha Thieltges1, Kirstin Kochems1, and Karin Jacobs1 — 1Saarland University, Dept. of Experimental Physics, D-66041 Saarbruecken — 2Univ Lyon 1, Inst Lumiere Mat, 43 Blvd 11 Novembre 1918, F-69622 Villeurbanne
In the classic case of a liquid running through a pipe, the flow velocity is usually the fastest in the center and decreases towards the walls. On small scales, the importance of this interface grows. In fact, on a microscale and under certain conditions, a liquid can reach a velocity at the interface (slippage). We study slippage of thin polymer films on two differently ordered types of self-assembled silane monolayers (SAM), as well as on an amorphous PTFE surface. The influence of the liquid*s and substrate*s structure on slippage is examined in dewetting experiments of polymers with various side groups. It turns out that PS on a SAM of relatively low degree of order shows an usual high slip length, whereas slip is reduced if PMMA or polyvinylpyridine (PVP) is used instead of PS. The specific kind of order plays a major role. Insights on the structure are gained with the help of X-ray reflectometry and MD-simulations. MD-simulations could mimic experimentally observed structural and dynamical data and enabled new insights to the mechanisms at the solid/liquid interface.