Abstract
Ivanov et al., European Polymer Journal 81 (2016) 598–606, conclude that “the phenomenon of the double (or multiple) melting behavior [in poly(trimethylene terephthalate) (PTT)] is not necessarily coupled to the melting–recrystallization processes and can be observed even in the absence of any recrystallization”. To further clarify this long standing issue, the multiple-melting behavior of isothermally crystallized PTT was examined using differential scanning calorimetry (DSC) and fast scanning chip calorimetry (FSC) in a wide range of heating rates (0.1Ks−1–60,000Ks−1). The critical heating rate to suppress recrystallization, βcritical, was determined as 2000Ks−1 from the analysis of heating rate dependence of melting temperature. Melting peaks observed below βcritical are due to the melting of recrystallized crystals, which are formed during slow heating. On the other hand, above βcritical, a single endothermic peak originated from the melting of initially formed crystals is observed. The result of thermal analysis strongly suggests that a single population of crystals is formed during isothermal crystallization of PTT. The heating rate of 1000Ks−1, as used by Ivanov et al., was therefore not fast enough to suppress recrystallization.
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