Abstract
AbstractA novel 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO)‐based Schiff base derivative, 6,6′‐(1,4‐phenylenebis (((3‐hydroxyphenyl)amino) methylene)) bis (dibenzo [c,e] [1,2] oxaphosphinine 6‐oxide) (SD), was synthesized and applied to polystyrene. The structure of terephthalaldehyde dihydroxymethane benzene and SD are characterized by Fourier‐transform infrared (FTIR) spectroscopy, 1H‐nuclear magnetic resonance spectroscopy, and elemental analysis. The results of thermogravimetric analysis tests show that the residue of the SD/PS composites increased from 0.21 to 7.09% with the increase of SD content, indicated that the thermal stability of the SD/PS composites was significantly improved. The introduction of SD also efficiently ameliorated the flame‐retardant property of SD/PS composites with limiting oxygen index increased by 33.15%, rated UL‐94 vertical burning test V‐0 rating, lower peak heat release rate, and total heat release. The mechanism of SD/PS composite was explored by scanning electron microscopy images and FTIR spectra of residue of SD/PS composites after calcination by muffle furnace. These tests prove that SD can be used as an effective polystyrene (PS) flame retardant.
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