Isoconversional Analysis of Combined Melt and Glass Crystallization Data

As proposed earlier (Macromol. Rapid Commun., 2004, 25, 733) the Kg and U* parameters of the Hoffman‐Lauritzen theory can be derived from isoconversional analysis of DSC data on melt crystallization. In this study, the analysis is extended to include both melt and glass crystallization data. The analysis of DSC data on non‐isothermal crystallization of poly(ethylene terephthalate) (PET) and poly(ethylene 2,6‐naphthalate) (PEN) demonstrates that for each of these polymers the combined melt and glass crystallization data can be described by single set of the Kg and U* values. The respective values for PET are 3.6 × 105 K2 and 7.5 kJ · mol−1 and for PEN 2.2 × 105 K2 and 6.6 kJ · mol−1. The use of combined data sets helps to improve the precision of computations. Experimental E on T data for melt (circles) and glass (squares) crystallization of PET.