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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Poster Session III-2
CPP 51.12: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/EG
Design and characterization of hydrogel bilayer strips with different crosslink densities — •Jonas Staudenmeir1, Lukas Conrads1, Sebastian Meyer1, Niklas O. Junker1, Dmitry N. Chigrin1,2, and Gero von Plessen1 — 1Institute of Physics (IA), RWTH Aachen, Germany — 2DWI Leibniz Institute for Interactive Materials, Aachen, Germany
Hydrogels are three-dimensional structures made of cross-linked polymers that can absorb and store large amounts of solvents. By changing external parameters (temperature, pH, etc.) hydrogels react with large volume changes by ejecting or absorbing the solvent. Due to such volume changes, bilayers consisting of a hydrogel and a passive elastic material are known to show bending upon temperature changes. To develop a bistable system, which performs a snap-through transition between low- and high temperature states, hydrogel bilayer strips consisting of two poly(N-isopropylacrylamide) (PNIPAm) layers with different crosslinker density were designed and investigated in a water bath. Due to the different swelling properties of the layers, the strips showed a curvature that could be continuously changed by slow heating and cooling. By fixing the strip ends to a flexible polydimethylsiloxane (PDMS) frame, a sudden change in the direction of curvature was observed upon heating. Experimental and simulation results are compared.