Preparation and Flame-Retardant Properties of Flame-retarded PLA Composites

doi:10.19491/j.issn.1001-9278.2019.01.005

Abstract

Abstract: Aluminum diethylphosphinate (ADP) was introduced into polylactide (PLA) to prepare a series of flame-retardant PLA composites (FR-PLA) by a melt-blending method. The effect of ADP on the thermal stability, flame retardancy and combustion property of FR-PLA were investigated by thermogravimetric analysis (TGA), limiting oxygen index (LOI), vertical burning experiment and microscale combustion calorimetry (MCC). The flame-retardant test results indicated that the addition of ADP effectively enhanced the flame retardancy of FR-PLA, and a UL 94 V-0 classification and an LOI of 31.6 vol % were achieved when 30 wt % of ADP was added into PLA. TGA results revealed that the incorporation of ADP reduced the degradation temperature of FR-PLA but improved their char yields. MCC analysis showed that the addition of ADP reduced the peak heat release rate (PHRR) of FR-PLA significantly. The FR-PLA containing 30 wt % of ADP presented a PHRR value of 290 W/g, which decreased by 37.1 % compared to pure PLA. This result implied a significant decrease in the fire hazard of FR-PLA.

References

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