Synergistic effect of a phosphorus–nitrogen flame retardant on engineering plastics

Authors

  • Tsu-Shang Leu,

    Corresponding author
    1. Department of Chemical Engineering, Yung-Ta Institute of Technology and Commerce, Linlo, Pingtung, Taiwan, 909, Republic of China
    • Department of Chemical Engineering, Yung-Ta Institute of Technology and Commerce, Linlo, Pingtung, Taiwan, 909, Republic of China
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  • Chun-Shan Wang

    1. Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan, 701, Republic of China
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Abstract

The novel flame retardant tris(3,5-dimethyl-4-diphenyl phenoxy phosphate)isocyanurate (TDPI) was synthesized from the reaction of diphenyl chlorophosphate and tris(3,5-dimethyl-4-hydroxybenzyl)isocyanurate. The compound was characterized with Fourier transform infrared spectroscopy, elemental analysis, mass spectrometry, 1H-NMR, and 31P-NMR. Furthermore, blends of the flame retardant with engineering plastics in various weight ratios were made, and their thermal stability and flame retardancy were determined by thermogravimetric analysis (TGA), UL-94 vertical testing, and limiting oxygen index (LOI) measurements. The phosphorus–nitrogen synergistic effect on flame retardancy was compared with the effects of commonly used tetraphenyl resorcinol diphosphate and tetrabromobisphenol A. TGA indicated that the TDPI/engineering plastics systems were stable up to 397–503°C at a 5% weight loss in a nitrogen atmosphere with a relatively high char yield (21.0–42.1% at 700°C) and that they a achieved UL-94 V-0 rating (with a low flame-retardant content: P, 0.76 wt %, and N, 0.34 wt %). No fume and toxic gas emissions were observed during the burning test for this system. The LOI values were 31.6–42.2. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 410–417, 2004

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