Growth-temperature curve

Figure 3.1. Solubility curve (solid line, equilibrium concentration curve) and the region in which nucleation and growth hardly occur (the Miers region, in between the dotted and solid lines). and C, are the equilibrium temperature and concentration, respectively and and C are the growth temperature and concentration, respectively.

Different from the dissolution of amorphous polymers is that of semi-crystalline ones. Dissolution of these polymers is much more difficult than that in the glassy state, as the enthalpy of melting has to be supplied by the solvent. Many solvents, which are able to dissolve tactic but glassy polymers, are unable to dissolve the same polymer in the crystalline state. Asmussen et al. (1965) have found that the velocity of dissolution of crystalline polymers as a function of temperature closely resembles the velocity of crystallisation versus temperature curves. Polymers formed at the highest rate of growth also dissolve at the highest rate. 

Figure 14 shows the craze growth resistance curves for the above loading rates together with that for Ki = 30 MPa /m/s from the isothermal analysis in Fig. 11 (Ki = 900Kj°) [22] for which isothermal conditions prevail. As the loading rate increases, Kf remains constant. Toughening caused by temperature effects is not observed, even when the local temperature increases at the highest loading rates.

Figure 3.15 Growth-rate curves of the faujasite zeolite NaX at various temperatures. The temperatures on the curves are in °C. Reproduced with permission from [16], Copyright (1980) John Wiley Sons, Ltd...

In order to demonstrate the noted role of traps for the 7d- Ed curves, we eom-pare two OFETs based on Pc films prepared at very different growth temperatures (samples A and B). The Pe film in sample A was grown at -17 °C and exhibited a high density of struetural defeets. This can be seen from the corresponding XRD spectrum in Figure 8.2, whieh shows only the first order diffraction spots, since higher order spots are suppressed due to the sfructural de-... 

Calibration was then made with the growth temperatures of laboratory cultures of different hapto-phyte species and with ocean water temperatures at which plankton samples had been collected. From these data sets, a number of different calibration curves evolved for different species and different parts of the world ocean so that some doubts arose as to the universal applicability of the unsaturation index. In a major analytical effort, Muller etal. (1998) resolved the complications and arrived at a uniform cahbration for the global ocean from 60°N to 60°S. The resulting relationship. 

Fig. 2. /-integral crack growth resistance curves for Fe-49Ni at room temperature, 76 K, and 4 K. 

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