Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 82, Issue 2, Pages 286-291Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2008.04.008
Keywords
polypropylene; intumescent flame retardant; metal chelates; flammability
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A novel oligomeric phosphorus-nitrogen containing intumescent flame retardant, poly(4,4-diamino diphenyl methane-O-bicyclicpentaerythritol phosphate-phosphate) (PDBPP), was synthesized and characterized. Effects of metal chelates on flame retardancy of polypropylene (PP)/PDBPP systems were studied and the results showed that the presence of metal chelates considerably enhanced the fire retardant performance as evidenced by the increase of LOI values and a great reduction in peak heat release rate of PP/PDBPP system. Raman spectroscopy, infrared spectroscopy and scanning electron microscopy demonstrated that metal chelates could react with polyphosphoric acid, a decomposition product of PDBPP, to form crosslinked network. Through salt bridges a more compact char layer was formed which was responsible for the improved thermal and flame retardancy properties of PP/PDBPP system. (C) 2008 Elsevier B.V. All rights reserved.
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