Dynamic Mechanical Analysis part 7 docx

... Rheology, MIT, Cambridge, 1990. R. De le Garza, Measurement of Viscoelastic Properties by Dynamic Mechanical Analysis, Masters thesis, Univer- sity of Texas at Austin, 1994. R. Hagan, Polymer Testing, ... in frequency scans and will be discussed in Chapter 7. Sometimes the polymer is added as a binder to an inorganic material, like the magnetic particles used to make the magnetic coatin...

Ngày tải lên: 05/08/2014, 09:19

... Chapter 7. Some techniques exist that combine these two into one experiment, and these are mentioned in Chapter 7. Finally the dynamic force can be constantly increased at a fixed rate and a dynamic ... only plot dynamic stress vs. dynamic strain, but also get E¢, E≤, E*, tan d, h*, and other dynamic properties for each cycle. This allows us to plot those properties as a function o...

Ngày tải lên: 05/08/2014, 09:19

... reference curve performs the superposition. This is shown in Figure 7. 17a. After shifting the curves, the resultant master curve (Figure 7. 17b) covers a range much greater than that of the original data. As ... mas- tercurve: 40 (7. 21) where E(t) is the stress relaxation modulus, E¢ is the storage modulus from the dynamic experiment, w is the dynamic test frequency, and E≤ is the d...

Ngày tải lên: 05/08/2014, 09:19

... LLC 7. 2 Frequency Effects on Materials 7. 3 The Deborah Number 7. 4 Frequency Effects on Solid Polymers 7. 5 Frequency Effects during Curing Studies 7. 6 Frequency Studies on Polymer Melts 7. 7 Normal ... an introductory book on dynamic mechanical analysis. This book attempts to give the chemist, engineer, or material scientist a starting point to understand where and how dynam...

Ngày tải lên: 05/08/2014, 09:19

... wide range of molecular weights for the polyolefins. 27 Frequency data are often manipulated in various ways to extend the range of the analysis by exploiting the Boltzmann superposition principle. ... response of the fibers is greatly affected by the solution it is tested in. Similar tests in both dynamic and static modes are used in the medical, automotive, and cosmetic industries....

Ngày tải lên: 05/08/2014, 09:19

... J 1 erg = 1.60E- 07 J 1 J = 0 .73 ft*lbF 1 J = 0.23 cal 1 kJ = 1 Btu 1 MJ = 0.28 kW*h Power 1 Btu/min = 17. 58 W 1 ft-lb/s = 1.4 W 1 cal/s = 4.2 W 1 hp (electric) = 0 .74 6 kW 1 W = 44.2 ... 1 kW = 0.28 ton (HVAC) Temperature 32°F = 491 .7 R 32°F = 0°C 32°F = 273 .2 K 0°C = 32°F 0°C = 273 .2 K NOTES 1. R. Steiner, Physics Today, 17, 62, 1969. 2. C. Macosko, Rheology Principle...

Ngày tải lên: 05/08/2014, 09:19

... Chapter 7. The agreement of both is normally within ± 10%. The relationship between steady shear viscosity, normal forces, and dynamic viscosity is discussed in more detail in Chapter 7. 4.3 ... ) o tt t= [] sin cos cos sin ©1999 CRC Press LLC (c) FIGURE 3 .7 (Continued). ©1999 CRC Press LLC (a) (b) FIGURE 3 .7 Examples of types of creep tests: (a) Multipl...

Ngày tải lên: 05/08/2014, 09:19

... Polymers, Wiley, New York, 1980, Ch. 5 7. 3a. R. Armstrong, B. Bird, and O. Hassager, Dynamics of Polymer Fluids, vol. 1, Fluid Mechanics, 2nd ed., Wiley, New York, 19 87, pp.151–153. 3b. D. Holland, ... Dover, New York, 1992, pp.192–200. 7. W. Young, Roark’s Formulas for Stress and Strain, McGraw-Hill, New York, 1989. 8. P. Zoller and Y. Fakhreddine, Thermochim. Acta, 238, 3 97, 1994. P. Z...

Ngày tải lên: 05/08/2014, 09:19

... Press LLC FIGURE 6. 17 Results and analysis of a “gel” time test from a DMA run. Note the “gel time” here is really the time to vitrification, not gelation. ©1999 CRC Press LLC 6 .7 MAPPING THERMOSET ... conditions. We will discuss the former case under Section 6.4 below and the latter as part of Section 6 .7. A final note on cure profiles is that a volume change occurs during the cure....

Ngày tải lên: 05/08/2014, 09:19

... can add data collected from creep experiments at very low rates of strain (frequencies), 27 see Figure 7. 17b. This is done by calculating the rate of strain of a material during its equilibrium ... CRC Press LLC dynamic scan. This is not always true, as shown in Figure 7. 2 for polyurethane. However, often the nature of the material is simple enough that this does work. 7. 2 FREQUE...

Ngày tải lên: 05/08/2014, 09:19