Hexagonal boron Nitride@ZnFe2O4 hybrid nanosheet: An ecofriendly flame retardant for polyvinyl alcohol.

An ecofriendly flame retardant was synthesized by hydrothermal method. The structure and morphology of h-BN@ZnFe 2 O 4 were characterized. PVA nanocomposites were prepared by adding h-BN@ZnFe 2 O 4 as filler into PVA. The effect of h-BN@ZnFe 2 O 4 on the flame retardant properties of PVA composites was studied and the flame retardant mechanism was also analyzed. The results showed that the peak heat release rate of PVA nanocomposites was slightly lower than that of pure PVA and the amount of CO, CO 2 , and hydrocarbons produced by the pyrolysis of PVA nanocomposites is less than that of pure PVA. The main reasons for this are the physical barrier effect of h-BN and catalytic carbonization effect of zinc ferrate. An ecofriendly flame retardant was synthesized by hydrothermal method, which is conducive to the formation of dense carbon layer during the process of PVA thermal degradation. The char layer acted as a physical barrier, inhibiting the exchange of heat between the fire and the matrix, isolating O 2 , preventing the permeation of volatile production to the fire zone, and thereby retarding the further degradation of PVA. Image 1 [ABSTRACT FROM AUTHOR]