fig3

Figure 3. SEM images of (A) APP and DPER, (B) AD@MCA microcapsules and AD, (C) PAD@M3, (D) Aged-PAD@M3, (E) PADM3, (F) Aged-PADM3, (G) Structure diagram of flame retardant CPCM. SEM: Scanning electron microscopy; APP: ammonium polyphosphate; DPER: dipentaerythritol; MCA: melamine cyanurate; CPCM: composite phase-change material; PEG: polyethylene glycol; ER: epoxy resin; EG: expanded graphite; AD: ammonium polyphosphate and dipentaerythritol; PAD@M:PEG2000/ER/EG/AD@MCA.