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<p>Green flame-retardant coatings were prepared on polyester/cotton (PC) fabric surfaces by alternating deposition of small molecule-carrying phytic acid (PA) and polyethyleneimine (PEI) using a layer-by-layer assembly method. The growth behavior, thermal stability, combustion characteristics, and effect of char formation of the PC fabrics were evaluated. When 20 bilayers (BL) were applied, the limiting oxygen index (LOI) of the PC fabric (PC-BL20) reached 28.2%. Vertical flame tests demonstrated that the incorporation of DOPO-p@PA/PEI significantly suppressed smoldering during combustion. Cone calorimetry revealed that the DOPO-p@PA/PEI coating effectively delayed the time to ignition of the fabrics. Moreover, it reduced the peak heat release rate from 263.4 to 88.8kW&#xa0;m<sup>−2</sup>, a remarkable 66.3% reduction, and decreased the total heat release from 22.2 to 18.1MJ m<sup>−2</sup>. The peak CO<sub>2</sub> production rate also decreased by 38.1%. Additionally, Raman spectroscopy and scanning electron microscopy showed that the char residue of the treated fabrics exhibited a greater degree of graphitization and structural integrity. The data of thermogravimetry/infrared spectrometry revealed that PC-BL20 sample effectively suppresses gas release during combustion. These results demonstrate that the DOPO-p@PA/PEI coating can be used to enhance the fire safety of PC fabrics.</p>

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Layer-by-layer assembly of green coating for remarkably improving the flame retardancy of polyester/cotton fabrics

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Weida Chen,
  • Zhehang Shi,
  • Yumei Dai,
  • Denglong Chen,
  • Hongzhou Li

摘要

Green flame-retardant coatings were prepared on polyester/cotton (PC) fabric surfaces by alternating deposition of small molecule-carrying phytic acid (PA) and polyethyleneimine (PEI) using a layer-by-layer assembly method. The growth behavior, thermal stability, combustion characteristics, and effect of char formation of the PC fabrics were evaluated. When 20 bilayers (BL) were applied, the limiting oxygen index (LOI) of the PC fabric (PC-BL20) reached 28.2%. Vertical flame tests demonstrated that the incorporation of DOPO-p@PA/PEI significantly suppressed smoldering during combustion. Cone calorimetry revealed that the DOPO-p@PA/PEI coating effectively delayed the time to ignition of the fabrics. Moreover, it reduced the peak heat release rate from 263.4 to 88.8kW m−2, a remarkable 66.3% reduction, and decreased the total heat release from 22.2 to 18.1MJ m−2. The peak CO2 production rate also decreased by 38.1%. Additionally, Raman spectroscopy and scanning electron microscopy showed that the char residue of the treated fabrics exhibited a greater degree of graphitization and structural integrity. The data of thermogravimetry/infrared spectrometry revealed that PC-BL20 sample effectively suppresses gas release during combustion. These results demonstrate that the DOPO-p@PA/PEI coating can be used to enhance the fire safety of PC fabrics.