STUDIES ON AG-80/SED SYSTEM

In this paper, a novel aromatic diamines curing agent, sulfone ether diamines (SED),was prepared with an optimum method.The mechanism of curing reaction of tetra functional epoxy (Ag-80)/novel curing agent (SED)was studied with FTIR. The results show that the main curing reaction can be attributed to the reactions between the primary aminepoxide and between the hydroxyl-epoxide when temperature is below 200℃ and to the reaction between the secondary amine-epoxide when temperature is above 200℃.The curing process of the system was studied with TBA, andtime-temperature-transformation(TTT) cure diagram was obtained, which provides valid foundation for determining the curing conditions of carbon fibre-reinfor-ced composites.Finally,the castings were prepared and their properties were determined. According to the experimental results, the toughness and especially,moisture resistance of the novel curing system increase compared with DDS system.