Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.1: Poster

Montag, 12. März 2018, 17:30–19:30, Poster A

Dry adhesives of structured polydimethylsiloxane — •Andreas Zheng¹, Volker Körstgens¹, Hsin-Yin Chiang², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — ²Rythm, 75009 Paris, France

Biocompatible, gecko-inspired dry adhesives are fabricated using polydimethylsiloxane (PDMS) in a 2-step fabrication process. First uncured PDMS is filled into a silicon mold of a regular hole pattern. After degassing and curing a PDMS replica containing a regular pillar pattern is obtained. In the second step the pillars of the PDMS replica are dipped into a thin film of liquid PDMS and attached onto an anti-adhesive film to achieve a mushroom-tip structure upon curing. The dimensions and the geometrical shapes of the achieved structures are investigated with optical microscopy. Adhesive forces of the PDMS patches in contact with different materials are measured with a tack test. Force-distance curves are obtained using a home-built instrument with a unique punch design developed for pressure sensitive adhesives. The dependence of adhesion forces on the structure of the PDMS patches is presented.