Viscosity conversions

TABLE 2.13 Viscosity Conversion Table Centistokes to Saybolt, Redwood, and Engler units. 

Viscosity Conversions. (By permission, Tube Turns Div., Chemetron Corp., Boil. TT 725.)... 

Viscosity Conversions. (Courtesy Kinney Vacuum Div., The New York Air Brake Co.)... 

A-6 Altitude and Atmospheric Pressures, 578 A-7 Vapor Pressure Curves, 579 A-8 Pressure Conversion Chart, 580 A-9 Vacuum Conversion, 581 A-10 Decimal and Millimeter Equivalents of Fractions, 582 A-11 Particle Size Measurement, 582 . A-12 Viscosity Conversions, 583 A-13 Viscosity Conversion, 584 A-14 Commercial Wrought Steel Pipe Data, 585 A-15 ... 

A-11 Particle Size Measurement, 434 A-l 2 Viscosity Conversions, 435 A-13 Viscosity Conversions, 436 A-14 Commercial Wrought Steel Pipe Data, 437 A-15 Stainless Steel Pipe Data, 440 A-16 Properties of Pipe, 441 A-17 Equation of Pipes, 450 A-l 8 Circumferences and Areas of Circles, 451 A-19 Capacities of Cylinders and Spheres,... 

While the rate of azo-compound decomposition shows only a small dependence on solvent viscosity, the amount of cage reaction (and hence f) varies dramatically with the viscosity of the reaction medium and hence with factors that determine the viscosity (conversion, temperature, solvent, etc.) 1... 

To do this we developed a computer model to predict the kinetic conditions during the runaway stage. The kinetic model is used to estimate the reaction rates, temperatures, pressures, viscosities, conversions, and other variables which influence reactor design. 

Figure 4.15 Mapping of viscosity rise versus time plot into viscosity-conversion plot. Reprinted, by permission, from P. K. MaUick, Composites Engineering Handbook, p. 507. Copyright 1997 by Marcel Dekker, Inc.

Table6.5 Some approximate viscosity conversions for viscous fluids.

Index Entries Biopolymer exopolysaccharides Rhizobium sp viscosity conversion factor. 

Isoconversion curves, if shown, would approximately parallel the gelation line (as well as the full cure line) because gelation is considered to be an isoconversion state The extent of conversion after vitrification changes very slowly, but does not cease. Reference to a complete 11 1 diagram enables a time-temperature path of cure to be selected which will follow a desired viscosity-conversion path. 

The use of boiling heat transfer raises the maximum conversion rates that can be controlled significantly beyond that of the agitated towers filled with heat transfer tubes. The main limitation that occurs is the removal of the vapor bubbles from the polymer solution. As the viscosity of the polystyrene solution increases rapidly with conversion, this becomes most limiting when the viscosity of the polystyrene solution exceeds 1000P (dPa/s). Below this viscosity, conversion rates of 40%/h can be controlled, but above this viscosity, the polymer mass foams up into the condenser and temperature control is lost, so that the maximum conversion rate decreases rapidly at high polymer concentrations. 

Table B.4 Viscosity conversion table. Source Dow Chemical Co., Midland, MI, USA...

It should also be noted that the viscometric technique can detect the presence of star-shaped aggregates, having the ionic active centers. The addition of ethylene oxide to hydrocarbon solutions of poly(isoprenyl)lithium leads to a nearly two-fold increase in viscosity Conversely, this results in an approximately twenty-fold decrease in solution viscosity, after termination by the addition of trimethylchloro-silane. This change in solution viscosity is reflected in the gelation which occurs when difunctional chains are converted to the ionic alkoxy active centers Bran-... 

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