Abstract
A study of the crosslinking of an epoxy resin with phthalic anhydride catalyzed by an imidazole catalyst has been carried out using differential scanning calorimetry, middle infrared and near infrared. The data from these methods indicate the process is a stepwise mechanism involving first anhydride ring opening, followed by epoxy ring opening and hydroxyl formation. Ether crosslinks begin to form after epoxy ring opening and the last step is formation of ester crosslinks.
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