Berlin 2024 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster I

CPP 15.1: Poster

Monday, March 18, 2024, 18:00–20:00, Poster C

Synthesis of diblock copolymer brush layers to control the adaptation time to water — •Benjamin Leibauer¹, Andres de los Santos Pereira², Ognen Pop-Georgievski², Hans-jürgen Butt¹, and Rüdiger Berger¹ — ¹Max Planck Institute for Polymer Research, Mainz, Germany — ²Institute of Macromolecular Chemistry CAS, Prague, Czech Republic

The Youngs model describes the wetting behavior of an ideal surface. Recently, Butt et al. presented an adaptation model, which connects adaptation processes of the surface to dynamic contact angles [1]. In order to test the adaptation model, we used a tilted plate setup, which allows measuring velocity dependent contact angles. The applicability of the adaptation model was experimentally verified by using surfaces made of statistical copolymers. In a next step, we synthesize polymer surfaces with the aim to control the adaptation time scale upon wetting and dewetting systematically. We used the surface-initiated atom transfer radical polymerization ATRP to selectively synthesize diblock copolymer brushes. We prepared poly(2-hydroxyethyl methacrylate) (PHEMA) as a hydrophilic block from the surface and we grafted polystyrene (PS)) or Poly(1-hexyl methacrylate) (PEtHexMA) as hydrophobic block on top of the PHEMA block [2]. By regulating the architecture and thickness of the polymer brush we tune the wetting properties systematically. In addition, we control the adaptation time of polymer brush surfaces by changing the drop-sample temperature.

Keywords: adaptation; diblock copolymer; wetting