Viscoelasticity of polymer hydrogel within the framework of the structural model

Aim: to consider the viscoelastic characteristics of a polymer hydrogel, namely, a polyvinylpyrrolidone and carboxymethylcellulose hydrogel, which were obtained for two values of the deformation amplitude in a fresh sample and in a swelled hydrogel sample. Methodology. An approximation of the experimental data of dynamic measurements by the equations of the structural rheological model was carried out at individual intervals of the cyclic frequency of shear oscillations. Results. The possibility of using the equations of the structural model to describe the frequency dependences of dynamic moduli is shown. The value of the coefficients of the rheological equations depends on both the deformation amplitude and the initial state of the hydrogel. Research implications. It is shown that the equations of the structural rheological model are capable of approximating the experimental data of dynamic measurements obtained for hydrogel samples at different deformation amplitudes.