Epoxy prepreg obtained via two sequential epoxy-amine condensations
عنوان دوره: 1
1Polymer Engineering Group, Composite Research Institute, Malek-Ashtar University of Technology
2Polymer Engineering Group, Composite Research Institute, Malek Ashtar University of Technology, Tehran, Iran
Despite the excellent properties, the instability of prepreg during the storage has reduced the efficiency and increased the waste of these materials. The idea of using a dual-curable formulation was investigated to eliminate this instability. In this idea, diethylenetriamine was used as a low-temperature curing agent in the off-stoichiometry ratio for pre-curing and dicyandiamide was used as a latent curing agent for final curing. The results of DSC showed that simultaneous presence of two curing agents with different reactivity resulted in two different curing reaction without interference. The results of FT-IR and DSC tests showed that the inactivation of latent curing agent in the pre-curing would cause thermal history loss.