Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 48: (Hydro)gels and Elastomers

CPP 48.3: Vortrag

Freitag, 15. März 2013, 10:15–10:30, H39

Elastic properties of squeezed spheres made of superabsorbers — •Thomas John and Christian Wagner — Experimentalphysik, Universität des Saarlandes

Superabsorbent polymers may absorb pure water up to 500 times its weight. Granulates of mm size can swell up to perfect spheres with up to 20 mm in diameter. The perfect spherical symmetry may be a combination of surface tension and inner pressure. Compressing of the spheres between two plates yields a force-strain relation. We present a model to calculate this force strain relation. The model conserves the volume and the restoring force is caused by the change of surface area made from the deformation. This is opposite to the Hertzian theory in contact mechanics, within the elastic modulus of the material plays the important role. Our model calculations are compared with experimental obtained force-strain data.

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