Polycarbonate Eyring plot

Figure 5.70 Eyring plot for polycarbonate. Reprinted, by permission, from N. G. McCmm, C. P. Buckley, and C. B. BucknaU, Principles of Polymer Engineering, 2nd ed., p. 191. Copyright 1997 by Oxford University Press.

FIG. 13.71 Eyring plot of strain rate) for polycarbonate at different temperatures. From Bauwens-Crowet et al. (1969). Courtesy John Wiley Sons. 

FIG. 13.73 Eyring plots of horizontal shift of the polycarbonate results presented in Fig. 13.71. 

Figure 14.14 Eyring plot of Oy/T versus logs for polycarbonate at different temperatures. (From Ref. 17.)...

Fig. 5.5. Eyring plot of <7 /7" against logs for polycarbonate (after C. Bauwens-Crowet, J. C. Bauwens, and G. Homes).

If we plot the quotient of the stress a in the polymer and the temperature versus the logarithm of the strain rate, points at constant temperature should fall onto a common line. Figure 8.9 plots this for polycarbonate, thus confirming our considerations. This kind of plot is called Eyring plot. If there is more than one type of obstacle, the slope of the curve is not constant anymore. If, for instance, one type of obstacle is dominant up to one temperature, but another is more important at higher temperatures, the Eyring plot contains a kink because both obstacles differ in the activation volume Ad. ... 

Eigure 5.70 shows plots of (Xy/T against log Sy for polycarbonate for a series of temperatures between 21.5°C and 140°C, where the Tg of polycarbonate is 160°C. Note that the predictions of the Eyring model are obeyed, namely, that Oy/T increases linearly with log By, and at constant log Sy,OylT increases with decreasing temperature. Thus, the yield strength is dependent on both strain rate and temperature. 

---