Preparation And Thermal Conductivity Of Fe₃O₄ Nanoparticles/Eposy Resin Composites

Epoxy resin is a kind of polymer materials with strong adhesive, high-stability and low shrinkage, but very low thermal conductivity. Filling the particles into epoxy resin may have the prospect of providing the composites with higher thermal conductivity, which can meet the development requirements in field of electronics industry, heating engineering, civil aviation and space industries.In this study, we prepared Fe3O4 nanoparticles by hydro-thermal method, and filled them into Epoxy resin E-44 to prepare Fe3O4 nanoparticles/eposy resin composites. Moreover, the effects of process conditions on hydro-thermal Preparation of particles were studied. And the influences of volume fraction of nanoparticles and magnetic field on thermal conductivity of composites were investigated.Reaction conditions for synthesizing Fe3O4 nanoparticles were varied, including the Fe2+/Fe3+molar ratio, solution pH value and molar concentration of surfactant SDS. An optimal method was gotten through comparation. The product Fe3O4 nanoparticles were superparamagnetic crystal with Mr 67.1emu/g and about 20nm.The Fe3O4 nanoparticles/eposy resin composites were prepared via dispersing the particles into epoxy resin, and curing under an external magnetic field or without. The thermal conductivities of the series of composites were tested. The results show that the thermal conductivities of composites increased with increasing particles content. Furthermore, the magnetic field enhanced the thermal conductivity. For example, when the volume fraction of Fe3O4 nanoparticles reached 28.47%, the thermal conductivity of composites cured under magnetic field was 3.05 times of pure eposy resin E-44, while the thermal conductivity of composites cured without magnetic field was only 2.47 times of pure E-44. Finally, the influences of nanoparticles volume fraction and magnetic field on thermal conductivity of composites are discussed.