A simple way to determine the degree of curing of the compound, is by observing the normalized intensity of the peaks corresponding to the solvents. Most of the compounds reach complete curing at a certain temperature and time. At that point the peaks that correspond to the solvents should be very small.

we usually follow the intensity changes of some specific IR bands. the appearance of new bands, or the disappearance of other bands. in some cases it is not straight forward and the help of IR data treatments will be required. such as difference spectrum or 2d correlation. the key is to find the right band to follow.

Different chemical groups (functional groups) absorb different wavelengths of IR. During a chemical reaction the change in absorbance (~concentration) of these functional groups can be monitored to study the kinetics of the reaction. MID infrared spectroscopy is useful for chemical fingerprinting, but the sampling techniques are limited to low path lenghts due to the high extinction coefficeints of most bonds. NEAR infrared spectroscopy allows the use of long path lengths and glass tubing to contain the reacting materials.

Article Cure kinetics and mechanisms of a tetraglycidyl-4,4′-diamino...