fig9
Figure 9. Morphological Evolution and Elemental Architecture of Post-Combustion Residues. (A-E) Digital and scanning electron micrographs of chars from: (A) Neat TPU, and composites incorporating (B) APP, (C) APP-1BL, (D) APP-2BL, (E) APP-3BL’ (F) Corresponding spatial element distribution for the TPU/APP@PEI@SiO2@MXene-3BL composite. APP: Ammonium polyphosphate; TPU: thermoplastic polyurethane; PEI: polyethyleneimine.
