Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Complex Fluids and Colloids I (joint session CPP/DY)

DY 3.1: Vortrag

Montag, 12. März 2018, 09:30–09:45, C 264

Brownian motion of a microbead coated with a temperature-responsive polymer brush layer — •David van Duinen, Dominik Pilat, Hans-Jürgen Butt, and Rüdiger Berger — Max Planck Institute for Polymer Research, Mainz, Deutschland

We report on a simple method that allows investigating the mechanical contact between a planar surface and a microbead that is covered with a thin stimuli-responsive polymer brush. The brush consists of linear poly(N-isopropylacrylamide) (PNIPAM), which has a lower critical solution temperature (LCST). Below the LCST, the brush is hydrated and extended. In contrast, above the LCST the polymer collapses; this system can be described using a spring model, which is stiffer in the collapsed state than in the hydrated state. Similarly, we have investigated the effect of cononsolvency on the mechanical contact.

This method allows the following and checking of the characteristics of thin polymer films upon exposure to stimuli. The method is simple, and provides information that is otherwise hard to obtain.