Comparison of Pentaerythrotol and Its Derivatives as Intumescent Flame Retardants for Polypropylene

Figure 12

FT-IR spectra of char of IFR-PP (PER) (A), IFR-PP (PEPA) (B), and IFR-PP (PBPP) (C) in (a) 300°C, (b) 500°C, and (c) after cone calorimeter tests.

(a)

(b)

(c)