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Two similar macrocycles protoporphyrin IX and zinc protoporphyrin IX (ZPP) have been used as cross‐linking agents for curing the epoxy resin of bisphenol A diglycidyl ether (BADGE, n = 0). The enthalpies and the activation energies of the esterification reaction of the 2 systems are very close to each other. However, the temperature of the minimum in the differential scanning calorimetry thermogram...
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