Читать книгу The Rheology Handbook - Thomas Mezger - Страница 90

Small rods are put into the following two materials, in order to observe their motion.

1 Hand cream: The rod remains standing straight in the cream, thus here, a yield point exists.

2 Silicone polymer (uncrosslinked PDMS): The rod moves very slowly to the side, i. e., although the highly viscous silicone displays a clear flow resistance, there is no yield point. It exhibits behavior of a viscoelastic liquid indicating a high value of the zero-shear viscosity in the low-shear range (see also Chapter 3.3.2.1a).