Abstract
A director theory of solutions and melts of flexible-chain polymers that is based on a simple law of anisotropic stress relaxation is developed. A spectral approach is used to study its structure. The simplest equation for the director that describes the dependence of the orientation of anisotropic viscoelastic fluids on shear rate is presented. The most appropriate flows for determining the material properties of polymer fluids with a single preferred direction are discussed. In addition, a new classification of anisotropic fluids is proposed.
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