Novel intumescent flame retardants: synthesis and application in polycarbonate

Authors

  • Wei Zhao,

    1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin, China
    2. Key Lab of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, China
    Search for more papers by this author
  • Bin Li,

    Corresponding author
    1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin, China
    2. Key Lab of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, China
    • Correspondence to: Bin Li, Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin 150040, China.

      E-mail: libin43_99@yahoo.com

    Search for more papers by this author
  • Miaojun Xu,

    1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin, China
    Search for more papers by this author
  • Kun Yang,

    1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin, China
    Search for more papers by this author
  • Li Lin

    1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin, China
    Search for more papers by this author

SUMMARY

Novel phosphorus-containing and nitrogen-containing intumescent flame retardants, bis-aminobenzyl spirocylic pentaerythritol bisphosphonate (BASPB) and arylene-N,N′-bis(2,2-dimethyl-1,3-propanediol phosphoramidate) (ABDPP), were synthesized, and their structures were characterized with Fourier transform infrared spectroscopy and 1H and 31P nuclear magnetic resonance. The phosphorus compounds were used to impart flame retardancy to polycarbonate (PC). Combustion behaviors and thermal degradation properties of the flame-retarded-PC composites were assayed by limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimeter test, and thermogravimetric analysis. PC/5 wt.% BASPB and PC/5 wt.% ABDPP composites passed UL-94 V-0 rating; their LOI values were 35.5% and 34.7%, respectively. Scanning electron microscopy revealed that the char properties had crucial effects on the flame retardancy. The mechanical properties and water resistance of the PC/BASPB and PC/ABDPP composites were also measured. After water resistance test, PC/5 wt.% BASPB and PC/5 wt.% ABDPP composites kept V-0 rating, and the mass loss was only 1.0%. Copyright © 2012 John Wiley & Sons, Ltd.

Ancillary