抄録
The work deals with the fabrication of long and short fiber reinforced ternary blends of epoxy resin, their morphology and mechanical properties. The ternary blends of epoxy resin based on diglycidyl ether of bisphenol A was modified with poly (ether sulfone) (PES) and poly (acrylonitrile-co-butadiene) rubber (NBR) and then cured with 4, 4-diaminodipheysulfone. For the reinforcement of the above ternary blends, long and short carbon fibers and aramid fiber were used. Morphology, bending properties and fracture toughness of these fiber reinforced ternary blends were evaluated. Short carbon fiber (CF) reinforced ternary blends of epoxy resin, PES and NBR was moulded by the solution method in which the fibers were mixed together with the solution of epoxy, PES and NBR in polar solvent and then cured. From the morphology observation, short CF reinforced ternary blends had two characteristic morphologies. One is the phase.inverted morphology in which the NBR-rich phase forms a continuous matrix, and the epoxy-rich phase forms particles. The other is a continuous domain of epoxy-rich phase contained CF. This continuous epoxy-rich domain grew larger with the slight increase of CF content. The bending properties and the fracture toughness of CF reinforced ternary blends were higher than unreinforced ternary blends, however the fracture behaviour changed from ductile to brittle behaviour at the content at the 6vol.% or more. Long carbon and aramid fiber reinforced ternary blends were moulded by the powder method in which the resin films manufactured from their powders of the solution of the ternary blends and the reinforcement fiber mats prepared using the “Fiber separating and flying machine ” were laminated by turns and compression moulded. The mechanical properties of the various long fibers reinforced ternary blends were higher than the short fiber ones.
