Explanation
It is also called dynamic viscosity coefficient. Measurement of viscosity of fluid under alternating stress. In the flow of macromolecule melt, in addition to the irreversible viscous flow, there are also reversible high elastic deformation. If the fluid is under the action of alternating stress, the viscosity and elasticity reaction in macromolecule melt flow are different, and the elasticity deformation and stress are in the same phase, without loss of energy; While viscous deformation is also in phase with stress, it loses energy.
Classification
Organic polymer materials -> Polymer Science -> Polymer Physics