The miscibility and melting behavior of binary crystalline blends of poly(ethylene terephthalate) (PET)/poly(trimethylene terephthalate) (PTT) have been investigated with differential scanning calorimetry and scanning electron microscope. The blends exhibit a single composition‐dependent glass transition temperature ( T g ) and the measured T g fit well with the predicted T g value by the Fox equation and Gordon‐Taylor equation. In addition to that, a single composition‐dependent cold crystallization temperature ( T cc ) value can be observed and it decreases nearly linearly with the low T g component, PTT, which can also be taken as a valid supportive evidence for miscibility. The SEM graphs showed complete homogeneity in the fractured surfaces of the quenched PET/PTT blends, which provided morphology evidence of a total miscibility of PET/PTT blend in amorphous state at all compositions. The polymer–polymer interaction parameter, χ 12 , calculated from equilibrium melting temperature depression of the PET component was −0.1634, revealing miscibility of PET/PTT blends in the melting state. The melting crystallization temperature ( T mc ) of the blends decreased with an increase of the minor component and the 50/50 sample showed the lowest T mc value, which is also related to its miscible nature in the melting state.
No takes yet. Share an insight, caveat, or question.
Liang et al. (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:
More from Journal of Applied Polymer Science