Abstract
The rheological properties of liquid media may be divided into two broad groupings: those that exhibit isochronal behaviour and those that do not. Many liquids exhibit non-isochronal behaviour but are chemically stable, and if allowed sufficient time to recover will return to their equilibrium state. There are, however, media which do not fall into the above classification; these are systems in which the chemical structure of the fluid changes with time as a consequence of chemical reaction or of nonreversible physical processes. These systems are difficult to investigate, since they require that the measurement apparatus be capable of accurate and precise determination of rheological properties over large changes in magnitude. Within this group of systems are thermosetting resins, plastisols, thermoplastic modified thermosets and thermosetting composites and filled material. Traditionally, rheological measurements are performed in conditions of either constant stress or strain and geometrically involve cone and plate, capillary, coaxial cylinder or parallel-plate configurations. 1These instruments are capable of providing well-defined shear fields and allow precise determination of the viscosity coefficients over a wide range of shear stresses and rates.
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© 1993 Springer Science+Business Media Dordrecht
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Pethrick, R.A. (1993). Rheological Studies Using a Vibrating Probe Method. In: Collyer, A.A. (eds) Techniques in Rheological Measurement. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2114-9_6
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DOI: https://doi.org/10.1007/978-94-011-2114-9_6
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