Heating curve during melting

A FIGURE 12.16 Heating curve during melting A graph of the temperature of ice as it is heated from -20 °C to 35 °C. During melting, the temperature of the solid and the liquid remain at 0 °C imtil the entire solid is melted. 

A typical DSC curve for a glass where crystals form during heating and then melt at a higher temperature is shown in Figure 12.1. The first... 

The mesophase state of liquid crystals is normally opaque due to relatively large sizes of ordered domains. Its transition point to the isotropic melt state is called the clear point T,. The DSC scanning curves of liquid crystals can exhibit either enantiotropic or monotropic phenomena. For the thermodynamically stable mesophases of liquid crystals, they occur between the melt and the crystal states during both cooling and heating processes, as illustrated in Fig. 10.5. When both the cooling and heating curves show two symmetric consecutive phase transitions, it is known as the enantiotropic phenomenon. In contrast, for the metastable mesophase... 

Fig. 23.8. sPP crystallized at 115°C Left) Variation of the interface distribution function during a heating to the melt. The peak location gives the crystal thickness [18]. Right) DSC curves measured with different heating rates after the crystallization... 

Temperature and enthalpy calibration of DSC curve. Calibration is carried out using the DSC curve determined under the same conditions as in step 2 for high-purity indium (purity >99.99%), and the leading slope of the indium is used to determine the instantaneous sample temperature during melting taking into account the heat-resistance correction and the heat of fusion of indium (28.41 J g ) used to calibrate the enthalpy of the DSC curve (mjcm" ). 

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