Abstract
The miscibility and melting properties of binary crystalline blends of poly(ethylene 2,6-naphthalate)/poly(trimethylene terephthalate) (PEN/PTT) have been investigated with differential scanning calorimetry (DSC). The glass transition and cold crystallization behaviors indicated that in PEN/PTT blends, there are two different amorphous phases and the PEN/PTT blends are immiscible in the amorphous state. The polymer–polymer interaction parameter, \( \chi _{12}\), calculated from equilibrium melting temperature depression of the PEN component was −1.791 × 10−5 (300 °C), revealing miscibility of PEN/PTT blends in the melt state.
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