Fluorescence and Aromatic Diamines for Epoxy Cure Studies

摘要

Fluorescence behavior of two important aromatic diamine curing agents,4,4'diaminodiphenyl sulfone (DDS) and 4,4'-diaminodiphenyl methane (DDM) was studied during cure with diepoxide or tetraepoxide. As cure reaction proceeds, both emission and excitation spectra exhibit red shifts due to the conversion of primary amines to secondary and tertiary amines. The matrix effects such as polarity decrease and viscosity increase on the fluorescence spectra of tertiary amino-DDS are negligible. Excitation spectra provide sharper peaks than emission spectra. Excitation spectral shift is found to be linearly proportional to the extent of amine reaction. The spectral shift has also been correlated to the extent of epoxide reaction. Intrinsic Fluorescence, Epoxy Cure, Excitation Spectral Shift.