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The preparation process of a flame-retardant coating through layer-by-layer assembly by (a) dipping method: coating melamine (M) and phytate (P) onto bamboo (B)); reprinted from Ref. [103] and (b) spraying method: coating hexagonal boron nitride (h-BN) and polyethylenimine (PEI) onto poly(acrylic acid) (PAA) modified polyurethane foam (PUF)). Reprinted with permission from Ref. [61] Copyright 2019 American Chemical Society.
