Abstract
Hexagonal boron nitride (h-BN) is more challenging to exfoliate into fewer layers than graphene due to the ionic bond between B and N atoms (lip-lip interaction) from adjacent layers. In this paper, boron nitride was exfoliated and hydroxylated by thermal oxidation in air. Hydroxylated boron nitride nanosheets (BNO) were modified by ionic liquids and added to epoxy resin to prepare epoxy matrix nanocomposites (EP/BNO@IL). The SEM results of EP/BNO@IL nanocomposites suggested that the introduction of ionic liquids enhanced the interfacial interaction between boron nitride nanosheets and epoxy resin (EP). Thermogravimetric (TG) results showed that introducing 2 wt% BNO@IL nanosheets improved the thermal stability of EP. In addition, cone calorimeter test (CCT) results showed that BNO@IL nanosheets enormously improved the fire safety performance of the epoxy resin. The peak heat release rate, total heat release, peak smoke release rate, and total smoke release of epoxy resin nanocomposites with 2 wt% BNO@IL nanosheets decreased significantly. In this work, the realization of ionic liquid modified boron nitride nanosheets (BNO@IL) provides new possibilities for improving the fire safety performance of EP.
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