Cure Characterization of Bisphenol A Dicyanate by Fluorescence, UV and FTIRSpectroscopy

摘要

Dicyanate ester resins are a relatively new class of high performance materialsin electronic and composite applications. In this work we present fluorescence, UV and FTIR spectroscopic investigation of cure chemistry of bisphenol A dicyanate ester. FTIR in situ monitoring shows cure kinetics is very sensitive to phenolic impurity. Strong fluorescence and phosphorescence signals associated with cure species have been detected. Fluorescence excitation and emission peaks appear at approximately 280nm and 430nm respectively. The peak intensity initially increases and then decreases; at the same time the peak maxima in the spectra undergo a red shift with cure time. The fully cured polymer emits phosphorescence around 480 nm. UV-Vis cure characterization shows that the absorption at 340 nm increase as the reaction proceeds. A series of model compounds are under study to identify the origin of fluorescence and phosphorescence emission and the UV changes.