Anisotropic Friction Models of Moving Macromolecules in Polymeric Liquids

ABSTRACT At the microscopic scale, polymeric liquids undergo microstructural evolution under large loads and high temperatures. Due to this, polymeric macromolecules are oriented and move with a high degree of friction anisotropy. The polymeric liquids are studied as continuum media or as assemblies of discrete models of individual macromolecules. Models of anisotropic internal friction in polymeric liquids are proposed in continuous and in discretized forms of macromolecules. Langevin motion equations describe Brownian random movements of polymer macromolecules. In this case the anisotropic viscous friction is studied. Taking into account, the individual macromolecules the following problems are analyzed: various discrete models of the macromolecules, different forms of their kinematics, and the presence of anisotropic dry friction in contact with a hypothetical base plane. Illustrative examples deal with dry friction of rod‐like macromolecules and snake‐like sliding of long macromolecules.