To improve the flame-retardant performance of cotton fabrics, an eco-friendly, simple and effective method was proposed. Amino trimethylene phosphonic acids (ATMP), chitosan, complexes with copper ion were deposited to cotton fabrics via layer-by-layer (LbL) assembly. FTIR spectra suggested that the LbL coatings were successfully deposited on the cotton fabrics surface. TGA analysis indicated the LbL coatings could promote the char formation and strengthen the thermal stability when the temperature high. The results of microscale combustion calorimeter test and vertical flame tests demonstrate that the existence of the CH-Cu/ATMP coating significantly suppressed the heat release rate of the cotton fabrics and higher concentration of copper ion and more layers in coating could bring better effect of flame retardancy.
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