Abstract
A novel zeolite imidazole framework-8 (ZIF-8) composite was synthesized as an accelerator, and its effects on the physical properties of epoxies were examined. To prepare the new accelerator, fullerene was oxidized with 3-chloroperoxybenzoic acid under reflux for 5 h in toluene. The dried powder (fullerene oxide, C60(O)n) was reacted with AgNO3 solution to obtain the fullerene oxide-Ag nanoparticle composite C60(O)n–Ag, which was further reacted with ZIF-8 to afford the composite C60(O)n–Ag/ZIF-8. The composite was analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and energy dispersive spectrometry. After the accelerator was added to the epoxy composites, the thermal curing properties were studied using differential scanning calorimetry. The composition was cured at a high temperature for subsequent physical tests, including dynamic mechanical analysis (DMA), transmission electron microscopy, and single overlap adhesion testing. The DMA results showed that the addition of C60(O)n–Ag/ZIF-8 to epoxy compositions resulted in an increase in tan δ by 11.5 °C, compared to that of the composition containing 2-methylimidazole (2MI) accelerator (147.2 °C). Furthermore, the single-lap shear strength test showed that the C60(O)n–Ag/ZIF-8 composition was 9.8% stronger (18.4 MPa) than that with 2MI (16.6 MPa).
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