Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 31, Issue 5, Pages 1099-1109Publisher
WILEY
DOI: 10.1002/pat.4844
Keywords
ammonium polyphosphate; flame retardant; polypropylene; supramolecular self-assembly; thermal stability
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Funding
- National Innovation and Entrepreneurship Training Program for college students [201910497247]
- National Natural Science Foundation of China [51703175]
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In order to improve its water resistance and compatibility with polymer matrix, ammonium polyphosphate (APP) is modified with melamine-trimesic acid (MEL-TA) aggregates by supramolecular self-assembly technology. Chemical structure and morphology of APP@MEL-TA are investigated by Fourier transform infrared spectroscopy and scanning electron microscopy (SEM), respectively. Intumescent flame retardant system of APP@MEL-TA and charring-foaming agent is introduced into polypropylene (PP) matrix. The flammability and combustion behavior of PP composites are investigated by limiting oxygen index (LOI), UL-94 vertical burning, and cone calorimetry tests. In terms of LOI values and cone combustion results, APP@MEL-TA performs better than pristine APP. Char residue of PP composites is investigated by SEM and Raman spectra. Flame retardant mechanisms are proposed based on thermal decomposition, combustion results, and analysis on char residue.
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