Viscoelasticity of liguid crystal solution of synthetic polypeptide within the framework of the structural model

Aim. To consider the viscoelastic characteristics of a lyotropic liquid crystal, namely, a solution of the synthetic polypeptide poly-β-benzyl-aspartate (PBA) in m-cresol, which were obtained at different values of the strain amplitude. Methodology . The experimental data of dynamic measurements were approximated by the equations of a structural rheological model at separate intervals of the cyclic frequency of shear vibrations. Results. The possibility of using the equations of the structural model to describe the frequency dependences of dynamic modules in conditions of nonlinear viscoelasticity is shown. It is shown that the coefficients of the rheological equations depend on the amplitude of the deformation in accordance with the provisions of the structural model. Research implications . It is shown that the equations of the structural rheological model are capable of approximating the experimental data of dynamic measurements in the case of a lyotropic liquid crystal. Rheological equations retain their form at different set values of the strain amplitude, which are in the region of nonlinear viscoelasticity.