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Effect of Different Graft Polymerization Systems on Surface Modification of Aramid Fibers with Γ-Ray Radiation

The poor wetting property between aramid fiber and resin results in the low interfacial performance due to the inertia and smooth surface of aramid. 60Co gamma-ray was used to modify the surface of domestic aramid fiber in the medium of epoxy chloropropane and diethanolamine respectively. The properties of aramid/epoxy composites were characterized by interface shear strength (IFSS) and the effect of two graft polymerization systems on fiber surface was discussed. The results showed that in an irradiation dose of 400kGy, when chloropropane and diethanolamine were used respectively as the graft system, the IFSS value of the composite material reached 86.53MPa and 70.37MPa, and compared with the untreated sample, each increase of 31.23% and 6.72%. High-energy radiation treatment increased the surface energy of aramid. The original smooth surface was disappeared. Oxygen content on fiber surface greatly risen, and aramid surface activity increased.