New Superefficiently Flame Retardant Bioplastic Poly(lactic acid) Flammability, Thermal Decomposition Behavior, and Tensile Properties
In this study, a superefficiently flame retardant bioplastic poly(lactic acid) was developed by incorporating gas solid biphase flame retardant N,N' diallyl P phenylphosphonicdiamide (P AA) into PLA matrix. The flame retardancy of PLA/P AA was investigated by limiting oxygen index (LOI) vertical burning test (UL94) and cone calorimeter test. Surprisingly, it was noted that only 0.5 wt loading of P AA increased LOI value of PLA from 20.5 to 28.4 and passed UL 94 V 0 rating at 3.2 mm thickness. In order to understand the effect of P AA on the thermal decomposition behavior of PLA, a comprehensive study was investigated in this paper, including (i) adopting modified Coats Redfern method to study the thermal decomposition kinetics of PLA and PLA/P AA systems, and (ii) characterizing the evolved gaseous products and the residues in the condensed phase by thermogravimetry linked Fourier transform infrared spectroscopy (TGA FTIR) and variable temperature Fourier transform infrared spectroscopy (VT FTIR) tec.