Oscillating rheometer

Figure 7 shows the schematic construction of Figure 8. Phase displacement between an oscillating rheometer. stress and strain.

Three useful tests have been used to evaluate the working and setting properties of experimental cements. These are the parallel plate plas-tometer, the penetrometer and the oscillating rheometer. They are described in the following sections of this chapter. 

Cook, W. D. Brockhurst, P. (1980). The oscillating rheometer-what does it measure Journal of Dental Research, 59, 795-9. 

Watanabe T. Early prediction of ovarian hyperstimulation syndrome during gonadotropin therapy by means of a damped oscillation rheometer. Biorheology 2002 39 767-86. 

Flowability of plastics is largely determined by the dependence of viscosity on shear rate. Viscosity of water, for example, does not change with shear rate. When water moves through a capillary, fast or slow, its viscosity is same. In a forced oscillation rheometer, parallel plates immersed in water can move fast or slow, but the viscosity of water remains still the same. Therefore, a plot of viscosity against shear rate looks as a flat straight line, parallel to the horizontal axis (Fig. 17.1). 

ABSTRACT A rotational benchtop Rheometer with vane spindles can be used to measure the static yield stress behavior of materials. By running at different rotational speeds, the Rheometer data can be equated with the viscoelastic information determined by an oscillating rheometer. The rotational Rheometer offers a less expensive method suitable for Quality Control needs. 

Results from the food testing show that the Brookfield YR-1 Rheometer may provide correlation with an oscillating rheometer [1]. Therefore, we suggest that a standard benchtop Rheometer with vane spindle may be used for reliable collection of fundamental viscoelastic data of adhesive materials as well. 

Rubber viscosity can be measured by a rotational viscometer, a capillary rheometer, or an oscillating rheometer. These are discussed later in the chapter. 

Fig. 6.1 Oscillating rheometer trace for setting glass-ionomer cement.

The steady shear viscosity and the viscoelastic properties of the Injected and effluent solutions were measured with, respectively, Contraves rotation viscometer LS30 and oscillation rheometer LS30 sinus (see Appendix A). 

KINETIC STUDY OF THE PEROXIDE CROSSLINKING PROCESS OF RUBBERS USING AN OSCILLATING RHEOMETER... 

---