Abstract
Fluorescence emission and excitation of curing agent, 4,4'-diaminodiphenyl sulfone (DDS), were studied during the curing process with a bifunctional epoxide or a tetrafunctional epoxide. As the curing proceeds, both the emission and the excitation spectra exhibit red shifts of about 25 nm for DDS due to the conversion of the primary amine groups in DDS to tertiary amine groups. Matrix effects such as the polarity decrease and the viscosity increase on the fluorescence spectra of the tertiary amino DDS (tt-DDS) were found to be small. The excitation spectra provide sharper peaks than the emission spectra, even though the overall spectral red shift in both spectra for DDS is about 25 nm
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