103 Melting Temperature (Tm) and Crystallization Temperature (Tc)
Tm is the temperature at which the ordered phase (crystalline regions) of a polymer (Figure 103.1) turns to the disordered phase. Amorphous polymers do not possess the melting point, but all polymers possess the glass transition temperature (Figure 103.2).
Tc is the temperature at which a crystallizable polymer can crystallize on cooling from melt.
An example of a differential scanning calorimetry (DSC) plot showing a glass transition, crystallization peak, and melting peak is shown in Figure 103.2.
It is worth noting that not all polymers undergo all three transitions during heating. The crystallization and melting peaks are only observed for ...
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