SKM 2023 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 11: Poster Session I

BP 11.5: Poster

Dienstag, 28. März 2023, 12:30–15:30, P1

An omnipresent material that still suprises: Anomalous stress relaxation of polydimethylsiloxane (PDMS) — Philipp Lach, Erdem Bondan, Pierre-Louis Cramer, Nan Xue, Robert W. Style, Stefanie Heyden, •Charlotta Lorenz, and Eric R. Dufresne — Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland

Polydimethylsiloxane (PDMS) is an elastomer which finds ubiquitous use as a model system in experimental settings, as well as in engineering applications. It is easy to fabricate and tune over a large stiffness range. Recent applications in soft robotics have stimulated a closer look at its mechanical properties. Here, we report anomalous responses of PDMS networks to deformation. In one set of experiments, PDMS becomes stiffer after repeated cycles of deformation. In another, PDMS has a non-monotonic stress relaxation in response to a step-strain. Together, these results suggest a mechano-chemical coupling in PDMS where deformed networks are capable of forming new cross-links.