Thermodynamic miscibility determination of TLCP and polyesters

In general, the miscibility between two polymers can be predicted by thermal characterization of the blends [36], One of the most simple and effective ways to predict miscibility between two polymers is to consider the behavior of the glass transition temperature in the blend systems, which is known as the Tg method. In miscible blend systems, only a single 7 g intermediate between two components appears in the amorphous state. Therefore, we studied the change of 

ET40)/PET blends, and in the 100/0 wt% P(HB80-ET20)/PET blend. This is because of either (a) a high content of rigid rod-like liquid crystalline component, or (b) an enthalpy which was too small to detect. The dependence of Tg on the blend composition can be evaluated by using the Gordon-Taylor Equation [37], 

In this study, melting point depression was used to obtain the parameter X12, known as the Flory-Huggins interaction parameter [40]  

Generally, a negative X12 interaction parameter means that the polymer pair is miscible, and by using the values shown in Table 20.4, we obtained negative X12 values of ca. —3.5 x 10-4 to —6.7 x 10 4 for the P(HB60-ET40)/PET system 

---