Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 57: Polymer Dynamics and Rheology (joint session CPP/DY, organized by CPP)
CPP 57.3: Vortrag
Donnerstag, 10. März 2016, 15:30–15:45, H40
The Origin of Strong Slip Of Polymer Melts on Structured Surfaces: A Molecular Approach. — •Mischa Klos1, Laurent Joly2, Sebastian Backes1, 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
Flow dynamics at the solid/liquid interface gain more importance when it comes to small scales. In special systems, a liquid can reach a finite velocity at the boundary to the solid. Our experiments probe this phenomenon via the dewetting of thin polymer films on hydrophobic substrates [1]. As hydrophobic coatings we use thin amorphous polymers films or different types of ordered self-assembled silane monolayers on silicon substrates. On silane surfaces, polystyrene (PS) of low molecular weight exhibit slip lengths up to micrometers [2]. On AF1600, no significant slip is observed. Scattering studies indicate an interfacial layer at the interface depending on the structure of the substrate [3]. Simulations where able to refine the molecular idea of the used SAMs [4]. However, strong slip is reduced if PMMA or polyvinylpyridine (PVP) are used instead of PS. MD-Simulations of our systems allow detailed insights into the dynamics of the polymer melt. [1] O. Bäumchen, et.al., J. Phys. Condens. Matter 24 325102 (2012) [2] R. Fetzer, et. Al., Europhys Lett. 75 638 (2006) [3] P. Gutfreund, et. al., Phys. Rev. E 87 012306 (2013) [4] J.M. Castillo Sanchez, et.al., Langmuir 31, 2630 (2015)