Figure 2.
Flame-retardant performances of the papers coated with different P-FRs. SEM images of FLBP@paper (a), RPnp@paper (b), TPP@paper (c) and paper (d). (e) Fourier transform infrared spectra of FLBP@paper, RPnp@paper, TPP@paper and paper. The absorption features at ~1590 and ~800 − ~740 cm−1, assigned to C=C and P-O-C absorptions in TPP, were zoomed in the inset. Ignitability tests of FLBP@paper (f), RPnp@paper (g), TPP@paper (h), and paper (i). The flames were extinguished in ~1.1 s (f), ~2.9 s (g), ~4.3 s (h), and ~4.7 s (i), respectively. Note: the paper (i) burned out completely before it was extinguished. (j) SET values of FLBP@paper, RPnp@paper, TPP@paper, and paper. Note: the unit of SET is second per gram.