Читать книгу The Rheology Handbook - Thomas Mezger - Страница 69

In the observed period of time, the sum of the partial orientations and re-coilings of the macromolecules, and as a consequence, the sum total of all disentanglements and re-entanglements, results in no significant change of the flow resistance related to the behavior of the whole volume element. Therefore here, the sum of the viscosity decreases and increases results in a constant value. Thus finally, the total η-value in this shear rate range is still measured as a constant value, which is referred to as the zero-shear viscosity η0. For unfilled and uncrosslinked molecules, zero-shear viscosity η0 is occurring as a constant limiting value of the viscosity function towards sufficiently low shear rates which are “close to zero-shear rate”.

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