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A DOPO‐base Schiff derivative used as a flame retardant for polystyrene
Author(s) -
Sun Yu,
Wang Yazhen,
Qing Yingbo,
Wu Xueying,
Shi Zhen
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49224
Subject(s) - limiting oxygen index , thermogravimetric analysis , polystyrene , fourier transform infrared spectroscopy , materials science , thermal stability , fire retardant , nuclear chemistry , polymer chemistry , schiff base , composite material , char , chemistry , chemical engineering , organic chemistry , polymer , pyrolysis , engineering
A 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, 1 H‐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.