Band Assignment and Chemical Aging Processes

In the literature on aging in the epoxy bulk, IR bands at 1730 and 1660 cm are attributed to carbonyl and amide groups that result from radical oxidation of 

IR band [cm- ] Formation conditions Stability Band assignment 

1725 during aging in dry atmosphere on Al and Au, slow and weak on Cu converted with H2O in humid atmosphere carbonyl 

1660 during cure on Cu, Al, and Au (weak) further growth in humid atmospheres stable amide/oxime 

1600 during aging in dry and stronger in humid atmospheres on Al, Cu, and Au stable on Cu, degradable on Al and Au during aging in moist air amino salt 

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