Molybdenum disulfide@nickel phyllosilicate hybrid for improving the flame retardancy and wear resistance of epoxy composites

Abstract

In this study, nickel phyllosilicate was synthesized based on molybdenum disulfide (MoS₂@NiPS) by the sol-gel method, and then MoS₂@NiPS was used to prepare epoxy composites. The thermal stability, flame retardancy, and frictional performances of epoxy composites were studied. With the addition of 3 wt% MoS₂@NiPS, the epoxy composite increased the limiting oxygen index from 23.8% to 26.1% and reduced the vertical burning time from 166 s for epoxy resin to 35 s. The residual char of the epoxy composite increased from 11.8 to 20.2 wt%. MoS₂@NiPS promoted the graphitization of the residual char, and facilitated the formation of a dense and continuous char layer, thereby improving the fire safety of epoxy resin. The epoxy composite with 3 wt% MoS₂@NiPS had excellent wear resistance property with a wear rate of 2.19 × 10⁻⁵ mm³·N^–1·m^–1, which was 68.8% lower than that of epoxy resin. This study presented a practical approach to improve the frictional and fire resistance of epoxy composites.

Graphical abstract

Keywords

molybdenum disulfide / nickel phyllosilicate / epoxy resin / flame retardancy

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