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A series of epoxide resins typically used in adhesive and coating applications have been characterized by time-offlight secondary ion mass spectrometry (ToFSIMS). Using thin-film silver cationization, oligomers containing up to 16 bisphenol-A groups were detected for the epoxide-terminated diglycidyl polyethers of bisphenol-A and propan-2-01 that comprise the bulk resins. For the higher molecular weight resins, the results indicate the additional presence of monoglycol-, diglycol-and phenol-terminated oligomers. For thicker film specimens, the spectra exhibit signals characteristic of the terminal epoxide and the bisphenol-A components comprising the oligomer chains. Furthermore, the relative intensities of these diagnostic signals reflect the compositions of the epoxide resins in a quantitative manner.

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