Online near-infrared measurements of an epoxy cure process compared to mathematical modeling based on differential scanning calorimetry measurements
H.-H. Friis-Pedersen
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
Search for more papers by this authorL. P. Houmøller
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
Search for more papers by this authorCorresponding Author
B. K. Storm
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark===Search for more papers by this authorH.-H. Friis-Pedersen
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
Search for more papers by this authorL. P. Houmøller
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
Search for more papers by this authorCorresponding Author
B. K. Storm
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
Esbjerg Technical Institute, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark===Search for more papers by this authorAbstract
An epoxy resin containing diglycidyl ether of bisphenol A, dicyandiamide, and an accelerator (diurone) was investigated under different cure cycles. The mathematical prediction of the degree of cure in a thermoset as a function of time and temperature was investigated and compared to measured data. Near-infrared analysis was used to measure the conversion of epoxy and primary amine and the production of hydroxyl. Modulated differential scanning calorimetry was used to measure the changes in the heat capacity during cure. The measurements revealed differences in the primary amine conversion and hydroxyl production, and close relations to the measurements of heat capacity were found. The measurements of the degree of cure revealed that cure cycles initiated at 80°C produced a lower degree of cure than cure cycles initiated at 90°C, although all cure cycles were postcured at 110°C. These findings were to some degree supported by measurements of the primary amine conversion and hydroxyl production. The characteristics found were attributed to differences in the cure mechanisms. The mathematical model did not incorporate these differences, and this may have led to discrepancies between the predicted and actual values of the degree of cure. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
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