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Ferric pyrophosphate (FePP) was used as additive to study its synergistic effect of thermal degradation on cotton fabrics. The microscale combustion calorimetry (MCC), thermogravimetric analysis (TG), Raman spectroscopy and Real Time Fourier transform infrared spectroscopy (RT-FTIR) were utilized to evaluate the synergistic effects of FePP on cotton/DIA. The MCC results revealed that cotton/DIA/FePP generated less combustion heat during heating than that of cotton/DIA. TG results showed that presence of FePP improved the thermal stability of materials. The Raman spectroscopy test showed that FePP can ameliorate the structural organization level of the carbon and the graphitization degree of the char. RT-FTIR data revealed the mechanism of the influence of FePP, which can catalyze the break of the flame retardant as well as promote the char forming. [ABSTRACT FROM AUTHOR]

Phosphorus-modified siloxanes monomer DOPO-IPDI-AMEO (DIA) was synthesized and characterized by H nuclear magnetic resonance (H NMR), P NMR, and Fourier transform infrared spectra (FTIR). It hydrolyzed and grew an organic-inorganic hybrid coating on the surface of cotton fabrics via sol-gel process. The conversion of gel reaction was characterized by solid-state Si NMR. The effect of the modified organic-inorganic hybrid materials on thermal properties of cotton fabrics was investigated by thermogravimetric (TG) analysis, real time Fourier transform infrared (RT-FTIR), and microscale combustion calorimetry (MCC) experiments. In addition, thermogravimetry-Fourier transform infrared spectra (TG-FTIR) were used to investigate the released degradation products. The characterization information represented that DIA has been prepared successfully. Also the conversion of gel reaction was fairly high. The TG data showed that char residues increased with the addition of the DIA coating. While the peak heat release rate (PHRR) decreased with the presence of the coating in MCC test. Moreover, the flammable degradation products dropped obviously, which can be observed from the data of TG-FTIR. [ABSTRACT FROM AUTHOR]

Highlights • The cotton fabrics were treated with genipin crosslinked (PEI/HACH) n coating. • C-(PEI/HACH)10-crosslink extinguished the fire in horizontal burning test. • The PHRR and THR of C-(PEI/HACH)10 were reduced significantly. • The genipin crosslinked (PEI/HACH) n coating exhibited good wash durability. Abstract A crosslinked and flame retardant coating was fabricated by layer-by-layer self-assembly on cotton fabric. The coated fabric was treated using positively charged polyethylenimine (PEI) and negatively charged hypophosphorous acid-modified chitosan (HACH) with subsequent crosslinking with genipin. The thermal stability and flammability of the treated cotton fabric were investigated by thermogravimetric analysis (TGA), the horizontal flame test and microscale combustion calorimetry. TGA results showed that, in an air atmosphere, there was more char residue for the treated cotton fabrics than for the untreated cotton fabric. The cottons treated with a 10-bilayer coating (C-(PEI/HACH)10 and C-(PEI/HACH)10-crosslink) could extinguish the fire during the horizontal burning test. The peak heat release rate and total heat release rate of C-(PEI/HACH)10 were reduced by 73% and 80%, respectively, compared with those of the untreated one. At the same time, the genipin crosslinked PEI/HACH coating exhibited good wash durability and mechanical properites for the treated fabrics. [ABSTRACT FROM AUTHOR]

The self-extinguishing coating, consisting of biobased chitin derivatives, phosphorylated chitin and deacetylated chitin (chitosan), was deposited on cotton fabrics via the Layer-by-Layer (LbL) assembled method. The content of phosphorylated chitin prepared on cotton fabrics surface is dependent on the bilayers’ number and concentration of phosphorylated chitin. In the vertical flame test, the cotton fabric with 20 bilayers prepared at the high phosphorylated chitin concentration (2 wt%) could extinguish the flame. Microcombustion calorimetry result showed that all coated cotton fabrics showed lower peak heat-release rate and total heat-release values compared with that of the pure one. Thermogravimetric analysis result indicated that thermal and thermal oxidation stability of all coated cotton fabrics were enhanced in the high temperature range (400–700 °C). This work provided the flame retardant multilayer films based on fully biobased chitin derivatives on cotton fabrics to enhance its flame retardancy. [ABSTRACT FROM AUTHOR]