Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Friction and Lubrication
CPP 42.4: Vortrag
Donnerstag, 3. April 2014, 10:15–10:30, ZEU 114
Switchable friction using asymmetric contacts of stimulus-responsive and non-responsive polymer brushes — •Sissi de Beer1,2, Edit Kutnyanszky1, and Julius Vancso1 — 1Materials Science and Technology of Polymers, University of Twente, Enschede, the Netherlands — 2Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich, Germany
Stimulus responsive (SR), solvated polymers can switch between an expanded and a collapsed conformation via external stimuli. Using molecular dynamics simulations and atomic force microscopy experiments, we show that such SR polymers can be employed to control the frictional response of two opposing polymer brushes in relative sliding motion. By using a brush composed of SR polymers in contact with a non-responsive polymer brush, the overlap between the opposing brushes can be switched ON/OFF: When both brushes are swollen, polymers of the opposing brushes interdigitate, which results in high friction upon shearing. In contrast, when the SR brush is collapsed, the solvent maximizes the interaction with the non-responsive brush. The latter circumvents both brushes from interdigitating, which results in low friction upon shearing.