Multiple melting behavior in isothermally crystallized poly(trimethylene terephthalate)
Melting behavior of poly(trimethylene terephthalate) (PTT) after isothermal crystallization from the melt state was studied using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) techniques. The subsequent melting thermograms for PTT isothermally crystallized within th...
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Veröffentlicht in: | European polymer journal 2004-03, Vol.40 (3), p.599-608 |
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Sprache: | eng |
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Zusammenfassung: | Melting behavior of poly(trimethylene terephthalate) (PTT) after isothermal crystallization from the melt state was studied using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) techniques. The subsequent melting thermograms for PTT isothermally crystallized within the temperature range of 182–215 °C exhibited triple (for crystallization temperatures lower than ≈192 °C), double (for crystallization temperatures greater than ≈192 °C but lower than ≈210 °C), or single (for crystallization temperatures greater than ≈210 °C) endothermic melting phenomenon. These peaks were denoted peaks I, II, and III for low-, middle-, and high-temperature melting endotherms, respectively. For the triple melting phenomenon, it was postulated that the occurrence of peak I was a result of the melting of the primary crystallites, peak II was a result of the melting of recrystallized crystallites, and peak III was a result of the melting of the recrystallized crystallites of different stabilities. In addition, determination of the equilibrium melting temperature Tm0 for this PTT resin according to the linear and non-linear Hoffmann–Weeks extrapolation provided values of 243.6 and 277.6 °C, respectively. |
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ISSN: | 0014-3057 1873-1945 |
DOI: | 10.1016/j.eurpolymj.2003.11.003 |