Abstract
AbstractThe chemiluminescence of three epoxy networks based on diglycidyl ether of biphenol A (DGEBA) crosslinked by respectively the phthalic anhydride (PA), hexahydrophthalic anhydride (HHPA), and methyl tetrahydrophthalic anhydride (MTHPA), was studied in the 180–240°C temperature range. Isothermal stationary and nonstationary (perturbed) experiments revealed that the behavior depends sharply on the anhydride structure. The higher emissivity of cycloaliphatic systems (MTHPA and HHPA) is explained in terms of hydrogen abstractibility on the hardener's moiety. The main difference between MTHPA and HHPA (intensity initially decreases for the former, increases for the latter) is explained by the consumption of the MTHPA double bonds in oxidative crosslinking processes. The results of perturbed experiments were essentially attributed to changes of alkyl radical concentration during the exposure under nitrogen. These changes can be modelled by a simple kinetic model taking into account the observed differences between the systems under study. © 1993 John Wiley & Sons, Inc.
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