Abstract
AbstractThe theory of nonlinear viscoelasticity of linear polymers is considered in the single‐molecule approximation. The dynamics of a macromolecule among similar molecules is studied with the use of the bead‐spring model. It is assumed that the surroundings of the molecule are equivalent to the simplest viscoelastic fluid with a single relaxation time. The viscoelastic drag force is determined by means of the relaxation equation. It is demonstrated that the viscoelasticity of the macromolecule's environment together with frame invariance leads to anisotropy of the mobility of the molecule. This proves to be of paramount importance in the description of nonlinear viscoelasticity of entangled polymers.
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