Effect of chitosan/sodium phytate-coated ammonium polyphosphate on flame retardancy of poly（lactic acid）

Abstract

Abstract: Ammonium polyphosphate （APP） was modified with chitosan （CS） and then with sodium phytate （PA-Na） to obtain coated APP （MCAPP）. MCAPP was characterized and analyzed by using infrared spectrometer， thermogravimetric analyzer， and cold field emission scanning electron microscope， etc. The as-prepared MCAPP was then used to prepare poly（lactic acid） composites through melt co-extrusion to enhance their flame-retardant performance. The results indicated that the addition of 7.5 wt% MCAPP at a CS/APP mass ratio of 1/2 could improve the flame retardancy and carbon formation capacity of the composites effectively. The peak-heat-release rate of the composites decreased from 654 to 469 kW/m2， and their residual carbon rate increased from 0.37 % to 6.85 %.

Key words: flame retardant, biomass-base, poly（lactic acid）, ammonium polyphosphate

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