Due to the outstanding physical properties, epoxy resin attracts more attention as one of the most important engineered polymers, and it shows wide applications in industry field, including structural material, surface coatings and adhesive. However, the utilization of epoxy is limited by its flammability, and the widely used flame retardant for epoxy resin would generate toxic and corrosive fumes during combustion.1 Thus, environmental concerns and legislation demands for new ?ame retardant agents for epoxy resin.2In this project Fe@C, Gr and Gr/Fe@Fe2O3 nanoparticles have successfully serve as nanofiller for obtaining magnetic epoxy resin nanocomposite (PNCs) with reduced flammability. The effects of nanofiller loading levels on the thermal stability, flammability, mechanical and magnetic properties were systematically studied. In the TGA test, although the introduction of all three nanofillers caused lower onset decomposition temperature of the PNCs, the Fe@C and Gr/Fe@Fe2O3 were found to favor the char formation from the epoxy resin. The enhanced char residue was also observed during the flammability tests. The flammability performance was evaluated by microscale combustion calorimetry considering the heat release capacity (HR capacity), peak heat release rate (pHRR), total heat release (total HR), and the char residue. And all three kinds of nanocomposite show reduced pHRR and total HR. In addition, foam char layer can be clearly observed in the PNCs with Gr/Fe@Fe2O3. The tensile strength observed in the PNCs with 1.0 wt% Gr/Fe@Fe2O3 and 5.0 wt% Fe@C nanoparticles is 58% and 60% higher than that of the pure epoxy, respectively. Finally, the magnetic properties of the PNCs with Fe@C and Gr/Fe@Fe2O3 are studied and the value of coercivity (Hc) is observed depends on the loading of the nanofiller.

Environment-friendly epoxy magnetic nanocomposite with reduced flammability

247th National Meeting (2014)

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