Abstract
Piperazine pyrophosphate (PAPP) combined with melamine polyphosphate(MPP) was adopted to prepare the flame retarded glass fiber reinforced polypropylene (FRGFPP) composites. The PAPP/MPP mixture with a 2:1 mass ratio achieved an optimum synergistic effect. The corresponding system (FRGFPP-4) passed the UL-94 V-0 classification (1.6 mm) and had an LOI value of 39.9%. Series of characterizations involving cone calorimeter test (CCT), thermogravimetric analysis (TGA), scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectra, and thermogravimetric analyzer coupled with FTIR (TG-FTIR) were performed to investigate the synergistic mechanism. The synergism depends mainly on the strong interaction between PAPP and MPP. The interaction accelerates the formation of the high-quality char layer, which plays a dominant role in improving the flame retardancy and the thermal stability of FRGFPP-4. Additionally, flame inhibition and fuel dilution effects in the gas phase also contribute to the superior flame retardancy of FRGFPP-4.
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