Time vs. viscosity

Figure 6.4. Apparent viscosity vs. time after loading.

Figure 8. A plot of log viscosity vs. time for determining the overall rate constant of the curing reaction.

The use of Brabender torque rheometer enabled us to evaluate the behavior of melt viscosity vs. time at low shear stresses the usual operating conditions were adopted—i.e., granules (28 grams) were introduced in the bowl, the temperature was fixed at 187 °C, and each run was started after 5 minutes of conditioning. 

High pressure rheometer (Camargo et al., 2000) Yes P, T, viscosity vs. time Typically 1000 psi Viscosity changes vs. time... 

Figure 10. Melt viscosity vs. time at 215°C., 35-gram charge, 30 r.p.m.

Figure 8. A semi-logarithmic plot of viscosity vs. time for the sulfur—DCP solutions at 140°C for the composition of DCP mole fraction, X = 0-50%...

Melt Viscosity Equation of Sulfui>-DCP Solutions. An assumption is made that the sulfur-DCP solution is a Newtonian fluid, i.e., the viscosity measured by the Brookfield viscometer is independent of the spindle speed, which is related to shear rate. The linear plots of log (viscosity) vs. time as in Figures 8, 9, and 10 give the following equation for a given sulfur-DCP composition at a given temperature ... 

Figure 3. Viscosity vs. time for 1% limed bone gelatin solution treated at 24° 1°C with 0.032% HT Proteolytic Takamine enzyme The solid circles indicate measured isoelectric points of pH 4.8...

Plots of viscosity vs. time shown in Figure 7 log viscosity vs. time shown in Figure 8 and temperature vs. time shown in Figure 9 can be generated and results from... 

Figure 7. Plot of viscosity vs. time for a curing system. Job 3330.

Figure 8. Plot of log10 viscosity vs. time for curing systems. Key , 3407 O, 3330 A, 3327 +, 3328.

Figure 12. Plot of viscosity vs. time for step shear rate experiment. Thixotropic recovery. Job 4373. Key , actual data Q, fit curve.

The curves for viscosity vs. time (Figures 1 and 2) show that the cure time can be controlled by initiator and promoter. The viscosity of polyols changes depending on temperature, particularly below 20°C. 

Fig. 1. Viscosity vs. Time for RPUMRPE With Varied Cobalt Naphthenate Curve 10.23% Curve 20.15% Curve 0.1%...

First, the pH can be changed by adding more of an electrolyte, for example IN HCl. In Figure 3, the effect of additions of IN HCl on the viscosity is shown on a plot of viscosity vs time. These measurements were made with a Brookfield Viscometer at 50 RPM. The interesting feature is that the shape of the curve remains the same whereas the position of the so-called knee shifts to longer times with larger acid additions. The knee starts at about 30 centipoise. For practical purposes the sol-gel transition is at 2000 cp. The effect of these small acid additions would appear to be a retardation of the bond formation needed to set to a gel, though the eventual structure is pretty much the same. 

Figure 33 Change in viscosity vs. time vmder hypo-osmotic conditions for different lipophilic surfactant concentrations. (From Ref 102.)...

At room temperature, the viscosity of the I.30E/Epon 862AV is slightly greater dum diat of Epon 862/W as etqiected. However, the increase is minimal and the processing characteristics are suitable for RFI. The viscosity vs. time and... 

Figure 3. Apparent viscosity vs. time after a 90° reorientation of a 14.0% PBDG/CH Ch sample...

Figure 23 Relative viscosity vs. time for a typical TGDDM-DDS system during a dynamic test comparison between experiment data (points) and model predictions (ral lines). (After Kenny et al., ref 2).

Figure 25 Viscosity vs. time at the skin and at the core for two glass fiber/polyester composites with different thickness cured in a mold at 60°C. (Ato Kenny at al., ref...

Fig. 5. Rheological characteristics of water-soluble polymers. All variables other than those on the axes are held constant, (a) Viscosity vs shear rate (b) viscosity vs time (c) viscosity vs concentrations below c. ...

Fig. 31. Comparison of the profile of the apparent mean viscosity vs, time for the silica filled epoxy molding compound, measured by RPA. (O denotes conventional crushed fused silica and denotes spherical fused silica)...

Figure 9.4 shows the extensional viscosity vs. time curves for unfilled polystyrene melt at different extensional rates. It was found [19] that the extensional viscosity may tend to become constant at very low deformaticm rates, but become unbounded at higher and higher deformation rates. With filler concentration at low loading levels of 5 and 10% of carbon black filler, it weis fotmd [19] that the plots resembled those in Figure 9.4. However, at higher filler concentrations, constant extensional viscosities were achieved with time and these values were found to decrease with increasing extensional rate as shown in Figures 9.5 ctnd 9.6 for 20 and 25 vol% carbon black loading.

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