The Fabrication And Properties Of Fe/Epoxy Nanocomposites

In this work, thermal curing behavior of epoxy with the curing agent methylhexahydrophthalic anhydride and the promoter triphenylphosphine was investigated by differential scanning calorimetry (DSC), the processing parameters was set by the analysis of the DSC results and the resin gelation time. DC arc-discharge plasma method was employed to prepare Fe nanoparticles. The prepared Fe nanoparticles were modificated by KH-550. The phase struction, composition, morphology and modification were investigated by the X-ray diffraction (XRD), scanning electron microscope (SEM), tansmission electron microscopy (TEM), fourier translation infrared spectroscopy (FTIR) respectively. The results showed that the obtained α-Fe nanoparticles had an average size of56.7nm, the surface of α-Fe nanoparticle had a "core/shell" structures which was coated with Fe oxide. After the modification, the amino was successfully grafted on the surface of Fe nanoparticles.The modificated Fe nanoparticles were added into the epoxy. The mechanical properties of the epoxy nanocomposites were evaluated by both flexural tests and impact tests. The flexural fracture microstructure of the epoxy nanocomposites were evaluated with SEM. The results showed that the epoxy nanocomposites have a good flexural strength until the nanoparticle mass content as high as20%, and the nanoparticles improved the toughness of epoxy. The thermal stability of the polymer nanocomposites was slightly decreased as the incorporation of nanoparticles revealed by the thermogravimetric analysis (TGA).The electromagnetic parameter of Fe nanoparticles mixed with max were studied in the2-18GHz frequency range by vetor network analazer. The Fe oxides shell of Fe nanoparticles containing Fe ions with different valence states show high dielectric loss for the oriental polarization. The small size of Fe nanoparicles lead to an enhanced surface anisotropy which is responsible for the high frequency natural resonance peaks. The Fe nanoparticles was added into epoxy to measure the reflection loss (RL). the results were compared with the calculated results. It is found that the measured result showed a better microwave absorption properties, which indicate that Fe nanoparticles were an excellent microwave absorption material.