The temperature dependence of the melting enthalpy has been determined for poly(ethylene terephthalate) and poly(aryl-ether-ether-ketone) from the experimental heat capacity variations with temperature of the solid and the liquid. A significant depression of the transition enthalpy occurs between the thermodynamic equilibrium melting point and the cold-crystallization temperature. The crystal weight fraction measurements, carried out by taking into account this temperature dependency, is in perfect agreement with the density determinations.
Посилання на статтю:
Temperature dependence of the melting enthalpy of poly(ethylene terephthalate) and poly(aryl-ether-ether-ketone) / R. Seguela // Polymer. – 1993. – Vol 34. – P. 1761-1764.