Synthesis and Application of a Novel Polyamide Charring Agent for Halogen-Free Flame Retardant Polypropylene

Figure 6

SEM images for the char residues of PP/27%IFR systems with and without PETA: (a) PP/27%IFR, (b) PP/27%IFR/3%PETA, and (c) PP/27%IFR/6%PETA.