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Application of isothermal and model‐free isoconversional modes in DSC measurement for the curing process of the PU system
Author(s) -
Li Shuyan,
Vuorimaa Elina,
Lemmetyinen Helge
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1574
Subject(s) - isothermal process , curing (chemistry) , differential scanning calorimetry , activation energy , materials science , polyurethane , thermodynamics , polymer chemistry , composite material , chemistry , physics
Abstract The dynamic, isothermal, and model‐free isoconversional modes of differential scanning calorimetry measurement were used to monitor the curing process of the polyurethane system. Conversions obtained from these three methods were in good agreement with one another, indicating that isothermal and model‐free isoconversional modes can successfully be used for monitoring the curing process. For the isothermal mode, the highest reaction rate occurred at time zero, and autoacceleration was not observed for this system. From the model‐free isoconversional mode, it was possible to calculate the activation energy changes during the curing process. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1474–1480, 2001