The crosslinking reactions of 4,4'-diaminodiphenyl sulphone with stoichiometric quantities of multifunctional epoxy resins were monitored using Fourier transform near infrared (FT-N1R) spectrophotometry. Manipulation of the pectral data enabled the concentrations of reactive groups throughout isothermal cure to be profiled. A kinetic model which included catalytic and diffusion-controlled reactions was developed to fit the data. Two glycidyl ether resins (Shell 1153 and Tactix 742) were chosen for this study to give an overview of this approach to commercial systems.
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