Читать книгу The Rheology Handbook - Thomas Mezger - Страница 252

Using the value of zero-shear viscosity η0 for uncrosslinked polymers, a relative specification may be given for the average molar mass M, since the following proportionality holds:

Equation 6.4η0 ~ M3.4

Therefore, polymers with a higher molar mass are showing higher η0-values (see also Chapter 3.3.2.1a3 with Equation 3.3). For non-flowing materials, e. g. for chemically crosslinked elastomers such as crosslinked rubbers, the calculated η0-values obtained would approach towards infinity. Therefore of course, it is not useful to determine any whatsoever η0-value for these kinds of materials, as it senseless for practical users to specify any viscosity value for a solid.