Abstract
Abstract The diglycidyl ether of bisphenol-A (DGEBA) and boron trifluoride ethylene diamine complex (BF 3 -EDA) were used to identify the species responsible for initiating epoxy polymerization. Experiments using the dynamic technique of differential scanning calorimeter (DSC) showed the results that the BF 3 -EDA complex breaks down rapidly into active species at 100°C and above. The active species, HBF 4 , complexes with the epoxy groups, producing an activated oligomer that reacts with epoxy in a polymerization reaction. It has been shown that the complex formation reaction can be resolved from the epoxy/epoxy polymerization reaction. The activation energies for the complex formation reaction is 74 kJ/mol and for polymerization reaction is 175 kJ/mol. The amine alone (EDA) cures DGEBA with a maximum peak of 100°C in 14 min while its complex with BF 3 cures DGEBA with a maximum peak of 200°C in 20 min under the same conditions.
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