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Synthesis of a novel polyphosphazene/triazine bi?group flame retardant in situ doping nano zinc oxide and its application in poly (lactic acid) resin

A novel polyphosphazene/triazine bi?group flame retardant in situ doping nano ZnO (A4?d?ZnO) was synthesized and applied in poly (lactic acid) (PLA). Fourier transform infrared (FTIR), solid state nuclear magnetic resonance (SSNMR), X?ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive spectrometer (EDS) were used to confirm the chemical structure of A4?d?ZnO. The thermal stability and the flame?retardant properties of the PLA composites were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), limiting oxygen index (LOI), vertical burning test (UL?94), and micro combustion calorimeter (MCC) test. The results of XPS showed that A4?d?ZnO has been synthesized, and the doping ratio of ZnO was 7.2% in flame?retardant A4?d?ZnO. TGA results revealed that A4?d?ZnO had good char forming ability (40 wt% at 600°C). The results of LOI, vertical burning test, and MCC showed that PLA/5%A4?d?ZnO composite acquired a higher LOI value (24%), higher UL94 rating, and lower pk?HRR (501 kW/m2) comparing with that of pure PLA. It indicated that a small amount of flame?retardant A4?d?ZnO could achieve great flame?retardant performance in PLA composites. The catalytic chain scission effect of A4?d?ZnO could make PLA composites drip with flame and go out during combustion, which was the reason for the good flame?retardant property. Moreover, after the addition of A4?d?ZnO, the impaired mechanical properties of PLA composites are minimal enough.

» Author: Lifeng Xu, Xingde Wu, Linshan Li, Yajun Chen

» Reference: doi:10.1002/pat.4570

» Publication Date: 04/03/2019

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [605658].

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