Isoconversional Analysis of Combined Melt and Glass Crystallization Data

✍ Scribed by Sergey Vyazovkin; Ion Dranca

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 126 KB
• Volume: 207
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500419

✦ Synopsis

Abstract

Summary: As proposed earlier (Macromol. Rapid Commun., 2004, 25, 733) the K~g~ 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 K~g~ and U* values. The respective values for PET are 3.6 × 10^5^ K^2^ and 7.5 kJ · mol^−1^ and for PEN 2.2 × 10^5^ K^2^ 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.

imageExperimental E on T data for melt (circles) and glass (squares) crystallization of PET.