Abstract:

Liquid low-viscosity hyperbranched epoxy resin HTDE-2 synthesized by one-Dot method was used to toughen and reinforce the bisphenol-A epoxy resin, and the effect of HTDE-2 content on the mechanical and ther-mal performances of the HTDE-2/bisphenol-A hybrid resin was investigated.Then,the structure of HTDE-2.the perform ance as well as the toughening and reinforcing mechanism of the HTDE-2/bisphenol-A hybrid resin were researched by means of FTr-IR,SEM,DSC,TGA,DMA and molecular simulation technologY. The resuhs indicate that the mechanical perform ance of the hybrid resin first increases with the HTDE-2 content to a maximum. and then decreases,and that,at a HTDE-2 mass fraction of about 9% in HTDE-2/bisphenol-A hybrid resin. the hybrid resin is of excellent integrated perform ance,because its tensile strength, flexural strength,impact strength and frac-ture toughness respectively increase by 20.7% ,14.2%, 208.8% and 74.9% .However.the corresponding glass transition temperature and therm al degradation temperature are found decreasing to some degree.

Key words: hyperbranched epoxy resin, preparation, toughening, reinforcement, mechanism, molecular simulation