Abstract
Abstract The toughening of epoxy resin (EP) and the interlaminar toughening of carbon fiber reinforced composite (CF/EP) laminates have been widely concerned. In this work, the needle-like γ-FeOOH nanoparticles were prepared by liquid phase deposition-air oxidation method, and then were calcined under different conditions to obtain γ-FeOOH and γ-Fe2O3 hybrid nanoparticles (γ-FeOOH@Fe2O3). Effect of calcination condition of γ-FeOOH@Fe2O3 and magnetic field assistance on fracture toughness (KIC) of EP was systematically investigated. Then the selected γ-FeOOH@Fe2O3 with the best toughening effect were used to improve the mode I interlaminar fracture toughness (GIC) of CF/EP laminate. The resulting γ-FeOOH@Fe2O3 have a length of around 1 μm, a diameter of around 100 nm and the Ms of 8.99–45.96 emu/g. After calcinated at 250 °C for 1 h, the γ-FeOOH@Fe2O3 containing 24 wt% FeOOH and 76 wt% Fe2O3 achieved the best toughening effect. Under a magnetic field of 0.09 T, the KIC of the γ-FeOOH@Fe2O3/EP composite (2.45 MPa m1/2) is 81.7% and 66.7% higher than that of neat epoxy and the composite without magnetic field induction, respectively. Furthermore, the GIC of the γ-FeOOH@Fe2O3/CF/EP composite (0.914 kJ/m2) is also significantly increased by 88.8% and 51.8% compared to that of CF/EP and the corresponding composite without magnetic field induction, respectively.
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