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Viscoelastic properties of pNIPAM-hydrogels: A mode-coupling theory study
Joel Diaz Maier1, Joachim Wagner1
1Institut für Chemie, Universität Rostock, 18051 Rostock, Germany.
Abstract:
We investigate the viscoelastic properties of poly(N-isopropylacrylamide) (pNIPAM) hydrogels cross-linked with glutaraldehyde by means of small amplitude oscillatory and steady shear experiments in dependence on the frequency and shear rate. These properties are strongly influenced by the ratio of monomer and glutaraldehyde as a cross-linker. Due to the thermosensitivity of pNIPAM, the rheological properties of these hydrogels can be tuned by the temperature as an external stimulus. The experimentally obtained viscosities and linear viscoelastic moduli are analyzed by a schematic mode-coupling ansatz employing a rescaled F12-model.
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