Abstract
1,2,4,5-Benzenetetracarboxylic acid/2-ethyl-4-methylimidazole (PMA/2E4MI) salt was prepared as a latent hardener for epoxy resin, and Fourier transform infrared was used to characterise its structure. The thermal latent curing property of PMA/2E4MI salt in diglycidyl ether of bisphenol A epoxy resin was investigated by storage stability, gelation time and differential scanning calorimetry measurements. The non-isothermal cure processes of diglycidyl ether of bisphenol A epoxy resin using PMA/2E4MI as a latent hardener in comparison with a common hardener, 2E4MI alone, were analysed adopting the Avrami and Arrhenius methods. The methods revealed a transition temperature (Ttr) at which the cure reaction mechanism showed a significant change. The obtained apparent activation energy (Ea) values of diglycidyl ether of bisphenol A cured with PMA/2E4MI were obviously larger than those of diglycidyl ether of bisphenol A cured with 2E4MI, especially in the early reaction stage. The results suggested that PMA/2E4MI salt possesses thermal latent curing properties for epoxy resins.
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