In this work, two imidazole-containing phosphoramides with the formulas of (C6H5)2P(O)[C6H10N3] (MIP) and (C6H5)P(O)[C6H10N3]2 (DIP) were synthesised and characterised using 1HNMR, 13C NMR, 31P NMR, IR, and MASS spectroscopies. MIP and DIP were treated on cotton fabric (CF) to promote thermal stability and flame retardancy of CF. IR spectroscopy and SEM-EDS analyses were utilized to indicate treatment of MIP and DIP on CF. TGA-DTG and SEM-EDS analyses were applied to investigate thermal stability of phosphoramides treated cotton fabrics (CF-MIP and CF-DIP). VFT, LOI, and cone calorimeter analyses were applied to evaluate MIP and DIP flame retardancy on CF. The characteristic key data of cone caloriometer test such as TTI, tPHRR, PHRR, THR, ACO2Y, FGI and FPI confirmed these compounds are efficient flame retardant on CF. All results indicated that thermal stability and flame retardancy of CF-MIP and CF-DIP had been promoted in comparison to CF, and DIP are better than MIP.
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